Name _________________________________________ Period ____ BIOLOGY MID-YEAR REVIEW Please use your notes, textbook, workbook, vocabulary definitions to answer the following questions. 1. The term biosphere refers to the parts of Earth that contain a. freshwater environments. b. living things. c. land masses. d. greater biodiversity. 7. The maintenance of constant internal conditions in an organism is known as a. homeostasis. b. negative feedback. c. structure specialization. d. adaptation. 2. Which phrase best describes Earth’s biodiversity? a. greater in tropical rainforests b. greater toward Earth’s poles c. greater according to energy needs d. greater where temperatures are most variable 8. Which aspects of life on Earth are accounted for by evolution? a. diversity and unity b. interaction and conflict c. lack of genetic and physical change d. divergence of structure and function 3. An individual living thing is called a(n) a. species. b. cell c. atom d. organism 4. Which of these characteristics is shared by all living things? a. They are made up of one or more cells. b. They make their own chemical energy. c. They have similar responses to light. d. They reproduce when one cell divides into two. 5. The basic unit of life is a. the cell. b. an atom. c. DNA. d. a species 6. Which statement best explains why the shape of teeth differs according to the diet of a species? a. Individual parts must work together. b. Organisms interact with other organisms. c. Structure and function are related in biology. d. Organisms must maintain homeostasis. 9. A beneficial inherited trait that is passed on to future generations is a(n) a. stimulus. b. adaptation. c. system. d. homeostatic mechanism 10. Which word best describes a scientific hypothesis? a. provable b. theoretical c. testable d. quantifiable 11. At which stage of scientific inquiry would scientists find out if their hypotheses were supported by their data? a. observing b. testing hypotheses c. analyzing data d. evaluating results 12. In an experiment, the condition that is manipulated by a scientist is the a. independent variable. b. dependent variable. c. constant. d. control condition. 13. Which of the following is an important characteristic of a scientific theory? a. proven by more than one scientist b. unchanged by new evidence c. accepted by the public d. supported by much evidence 14. One way in which experimental research differs from observational research is that only experimental research can a. test a hypothesis. b. produce scientific results. c. support a theory. d. show cause and effect. 15. An electron microscope would be the best choice for viewing a. live bacteria. b. human ligaments. c. details of cell structure. d. a person’s brain activity. 16. Which phrase best defines a gene? a. basic unit of life b. segment of DNA c. slice of a specimen d. inherited trait 17. Knowledge of biology can promote advances by helping all people make a. strong opinions. b. informed decisions. c. profitable products. d. individual values. 18. The use and application of living things and biological processes is known as a. medical research. b. human biology. c. epidemiology. d. biotechnology. 19. Which of the following is an example of transgenic organisms? a. bacteria that produce human insulin b. microorganisms that produce cheese c. yeast used to produce bread d. algae that produce hydrogen gas 20. Biotechnology raises ethical questions, primarily concerning the a. safety of eating transgenic plants. b. wisdom of continuing to use technology. c. ways in which knowledge should be used. d. best use of funds for biological research. 21. Which phrase best describes atoms? a. single-celled organism b. smallest basic units of matter c. parts of a nucleus d. positively charged particles 22. Which of the following cannot be broken down by ordinary chemical means? a. element b. compound c. molecule d. bond 23. What is a compound? a. two atoms of a single element bonded together b. atoms of different elements bonded together in certain ratios c. separate atoms of multiple elements in varying ratios d. a molecule of two oxygen atoms 24. An ion is formed when an atom gains or loses a. protons. b. neutrons. c. bonds. d. electrons. 25. Atoms connected by covalent bonds share a. pairs of electrons. b. ionic compounds. c. carbon and oxygen. d. hydrogen ions 26. Hydrogen bonds can form between regions of polar molecules that are a. nonpolar. b. negatively charged. c. oppositely charged. d. uncharged (neutral). 27. The attraction among molecules of different substances is called a. cohesion. b. adhesion. c. specific heat. d. surface tension. 28. Why is water necessary to your body? a. It prevents large changes in blood pH. b. It dissolves and transports substances. c. It dissolves nonpolar fats and oils. d. It forms the solutes in blood plasma. 29. Which of the following phrases best describes a solvent? a. has a high concentration of solutes b. can be dissolved by the solute c. present in a greater concentration than solutes d. usually a sugar or a protein 30. A solution with a high concentration of H ions a. shows a pH of 7. b. kills all organisms. c. has a high pH. d. is very acidic 31. Carbon is unique due to the carbon atom’s a. bonding properties. b. six outer unpaired electrons. c. ionic compounds. d. hydrogen bonding strength. 34. Fats, oils, and cholesterol are all types of a. cell membranes. b. hormones. c. lipids. d. fatty acids. 35. Proteins are composed of which molecules? a. amino acids b. fatty acids c. monosaccharides d. nucleic acids 36. DNA and RNA are two types of a. proteins. b. nucleic acids. c. lipids. d. carbohydrates. 37. Which phrase best describes an exothermic chemical reaction? a. does not absorb any energy b. forms products with higher bond energy than reactants c. is in a state of equilibrium d. releases more energy than it absorbs 38. Chemical reactions change substances into different substances by a. conserving matter between the substances. b. breaking and forming chemical bonds c. strengthening electrical charges of substances. d. changing a solvent into a solute. 32. Which category of carbon-based molecules includes sugars and starches? a. unsaturated fatty acids b. phospholipids c. proteins d. carbohydrates 39. Identify the reactants in the following chemical 33. The double arrows tell you that the following reaction CO2 H2O CO2CO3 a. takes place very rapidly. b. is very unstable. c. occurs in both directions. d. has high bond energies. 40. What is the term for the amount of energy that needs to be added for a chemical reaction to start? a. chemical energy. b. activation energy. c. bond energy. d. reactant energy. reaction: 6H2O 6CO2 C6H12O6 6O2 a. 6H2O and 6CO2 b. 6CO2 and C6H12O6 c. 6H2O, C6H12O6, and 6O2 d. C6H12O2 and 6O6 41. Which phrase best describes an exothermic chemical reaction? a. does not absorb any energy b. forms products with higher bond energy than reactants c. is in a state of equilibrium d. releases more energy than it absorbs 42. Which of the following is a term for a group of similar organisms that can reproduce and produce fertile offspring? a. individual b. population c. species d. fossil 43. Which scientist proposed that if an organism used a structure so much that it grew, the trait of that larger structure could be passed to its offspring? (This is no longer believed to happen…) a. Erasmus Darwin b. Jean-Baptiste Lamarck c. Georges de Buffon d. Charles Lyell 44. Which of the following is a fossil? a. a plant that has recently died b. a group of similar organisms that can reproduce c. a structure or organ that no longer functions d. a trace of an organism that existed in the past 45. The theory that landforms on Earth’s surface, such as mountains, waterfalls, and canyons, were created as the result of sudden, spectacular events is called the theory of a. uniformitarianism. b. catastrophism. c. gradualism. d. evolution. 46. The difference in the physical traits of an individual from those of other individuals in a group is called a(n) a. change. b. adaptation. c. species. d. variation. 47. Over time, adaptations can lead populations to experience a. environmental changes. b. genetic changes. c. geologic changes. d. extinctions. 48. What did Charles Darwin observe in finch populations on the Galápagos Islands off the coast of South America? a. different species on different islands b. all species on one of the islands c. identical species on all the islands d. the same species as in North America 49. What did Charles Darwin learn from the fossils of a giant armadillo that he found in Argentina? a. An earthquake led to the armadillo’s extinction. b. Armadillos used to be marine organisms. c. Modern animals may be related to fossilized organisms. d. Fossils do not resemble modern animals. 50. The development by scientists of a new color in a rose is the result of a. natural selection. b. artificial selection. c. descent with modification. d. overproduction. 51. In natural selection, the selective agent is the a. humans. b. mutations. c. breeders. d. environment. 52. All the rabbits living in a particular area would be an example of a(n) a. population. b. species. c. fossil. d. individual organism. 53. A bird that can easily out-compete other birds for food and that can produce many eggs has a high a. life expectancy. b. mutation rate. c. fitness. d. adaptability. 54. Which of the following describes natural selection? a. It acts on genetic material directly. b. It acts on existing physical traits. c. It forms new traits. d. It forms new genetic material. 55. Which of the following is an example of a vestigial structure? a. the wings of red-tailed hawks b. the hind limbs of a house cat c. the fins of a shark d. the wings of an ostrich 56. Biogeography is the study of the a. distribution of organisms around the world. b. environments around the world. c. different types of rocks around the world. d. age of fossils around the world. 57. What is suggested by the similarity of early embryos of different species of vertebrates? a. no evolutionary relationship between the groups b. recent common ancestry c. similar environments in the past d. evolution from a distant common ancestor 58. Some organisms that share a common ancestor have features that have different functions, but similar structures. These are known as a. vestigial structures. b. analogous structures. c. homologous structures. d. fossil structures. 59. If an organism has a vestigial structure, that structure likely once had a function in a(n) a. close relative. b. early ancestor. c. unrelated organism. d. embryological stage. 60. Paleontology is the study of a. ecosystems. b. genetics. c. fossils. d. rocks and minerals. 61. Two organisms that are closely related would have a. very similar DNA sequences. b. exactly the same DNA sequences. c. no proteins in common. d. completely different DNA sequences. 62. Evolution is considered to be one of the most important theories in science, because it a. was developed more than 100 years ago. b. is not supported by the fossil record. c. unites the fields of biology, geology, chemistry, and ecology. d. was discovered by Charles Darwin, a famous scientist. 63. Protein sequences in one organism that resemble those of another suggest a a. coincidence. b. lack of evolutionary relationship. c. great number of mutations. d. shared ancestry. 64. A measure of how commonly a particular allele occurs in a population is known as the a. gene pool. b. allele frequency. c. mutation rate. d. phenotype. 65. The more genetic variation a population has, the more likely it is that some individuals will a. evolve. b. migrate. c. survive. d. mutate. 66. Genetic variation can arise from a random change in the DNA of a gene. This change is called a(n) a. mutation. b. gene flow. c. gene pool. d. allele. 67. The normal shuffling of alleles during meiosis results in a. mutations. b. hybridization. c. reproduction. d. recombination. 68. Which term means the crossing of two different species that share common genes? a. mutation b. hybridization c. population d. recombination 69. What do molecular clocks use to measure evolutionary time? a. dichotomous keys b. mutation rates c. physical characteristics d. binomial nomenclature 70. Which of the following has the lowest mutation rate? a. ribosomal RNA b. protein sequences c. amino acids d. mitochondrial DNA 71. How does mitochondrial DNA differ from nuclear DNA? a. Mitochondrial DNA is inherited from both parents, and nuclear DNA is not. b. Mitochondrial DNA has a lower mutation rate than nuclear DNA. c. Mitochondrial DNA is inherited from the mother only, and nuclear DNA is inherited from both parents. d. Mitochondrial DNA is made of amino acids and nuclear DNA is made of nucleotides. 72. The best molecular clock for comparing distantly related species is a. mitochondrial DNA. b. ribosomal RNA. c. nuclear DNA. d. protein. 73. The best molecular clock for comparing closely related species is a. mitochondrial DNA. b. ribosomal RNA. c. nuclear DNA. d. protein. 74. What is the observable change in the allele frequencies of a population over time called? a. selection b. microevolution c. distribution d. recombination 75. Natural selection that changes the distribution of a trait to favor one extreme phenotype is called a. disruptive selection. b. stabilizing selection. c. normalizing selection. d. directional selection. 76. In stabilizing selection, what occurs in a population? a. The population shifts toward one of two extreme phenotypes. b. Both extreme phenotypes shift toward the middle. c. The intermediate phenotype becomes more common. d. The intermediate phenotype becomes rare. 77. A population that is not undergoing natural selection displays what type of distribution? a. normal b. disruptive c. directional d. stabilizing 78. In a population of birds, intermediate beak size is selected against, and both very small and very large beak sizes are favored. What type of selection is this an example of? a. directional b. disruptive c. normal d. stabilizing 79. Chance changes in allele frequencies within a population are called a. gene flow. b. gene pool. c. genetic drift. d. sexual selection. 80. A small number of birds, blown off course during migration, find an island and colonize it. This population will most likely experience genetic drift as a result of the a. founder effect. b. bottleneck effect. c. sexual selection. d. mutations. 81. Fighting between male elephant seals over females is an example of a. bottleneck effect. b. intrasexual selection. c. intersexual selection. d. founder effect. 82. What increases genetic variation when animals move from one population to another population? a. genetic drift b. sexual selection c. bottleneck effect d. gene flow 83. A problem in all populations influenced by the bottleneck effect is that a. genetic variation is lost. b. alleles can’t become fixed. c. offspring inherit harmful alleles. d. chance no longer affects them. 84. Which of the following conditions could mean that a population is in HardyWeinberg equilibrium? a. The population is small. b. Gene flow is common. c. Mating is random. d. Mutations occur frequently. 85. The Hardy-Weinberg equation is used to a. estimate the rate of mutations in a population. b. determine the likelihood of random mating. c. calculate the gene flow rate among organisms. d. predict genotype frequencies in a population. 86. The five factors that can lead to evolution are gene flow, genetic drift, mutation, natural selection, and a. sexual selection. b. controlled mating. c. emigration. d. immigration. 87. Mutations are important because they bring about a. death of the organism in which they develop. b. genetic variation needed for a population to evolve. c. benefits for the individual, but not for the population. d. Hardy-Weinberg equilibrium within a population. 88. Which of the following statements applies to real populations? a. Mutations are rarely passed to offspring. b. Hardy-Weinberg equilibrium is rare. c. Gene flow represses alleles for desirable traits. 93. What kind of isolation occurs when two populations of birds have different courtship dances? a. geographic b. sexual c. temporal d. behavioral 89. Evolution cannot occur in large populations 1.What is speciation? a. combining of two species to form one with different traits b. isolation that affects mating behavior c. timing of mating that prevents normal sexual selection d. divergence of two or more species from an existing one 94. Which of the following processes is considered to be random? a. genetic mutation b. natural selection c. adaptive radiation d. coevolution 90. A difference of chemical scents between two populations is an example of what kind of isolation? a. temporal b. behavioral c. geographic d. disruptive 91. An earthquake causes an ocean channel to open up on an island where a low area previously existed. The island’s lizard population is now separated on the two parts of the island, providing an example of a. geographic isolation. b. behavioral isolation. c. disruptive selection. d. temporal isolation. 92. Which of the following examples illustrates a temporal barrier to mating between populations? a. Populations of the same species of seal live on islands too far apart to swim between them for mating. b. Species of birds have elaborate courtship dances, and females select the best dancers as mates. c. Varieties of oak tree produce pollen during different seasons, so they can’t pollinate one another. d. Herds of caribou misinterpret each other’s mating behavior, so they fight instead of mating. 95. The American flying squirrel and the flying phalanger of Australia live in similar environments and look very similar. However, they are not closely related. Their resemblance is most likely an example of a. sexual selection. b. temporal isolation. c. convergent evolution. d. divergent evolution. 96. The Galápagos Islands in the Pacific Ocean have varied habitats. Divergent evolution is occurring on these islands, meaning that the species that live there a. have lived unchanged through long periods of stability. b. are becoming more like each other in response to their habitats. c. change in response to changes in other species they interact with. d. had common ancestors but have become increasingly different. 97. Like all flowering plants, the snapdragon must be pollinated to reproduce, but its flowers are closed. A bumblebee has just enough weight to open a snapdragon flower by landing on it. This adaptation is an example of a. convergent evolution. b. coevolution. c. divergent evolution. d. speciation. 98. The total and permanent disappearance of a species from Earth is called a. radiation. b. coevolution. c. extinction. d. equilibrium. 99. The fossil footprint of a dinosaur is an example of a(n) a. amber-preserved fossil. b. natural cast. c. natural cast. d. permineralized fossil. 100. In which of the following situations would it be more likely for a fossil to form? a. A vertebrate dies near a river delta. b. An invertebrate dies on a mountain. c. A soft-bodied worm dies in a desert. d. A mammal dies on a rock bed. 101. The amount of time it takes for half of a radioactive isotope to decay is known as the a. isotope. b. half-life. c. product. d. radiocarbon. 102. Radiometric dating of which of the following samples has estimated the age of Earth to be 4.5 billion years? a. Burgess Shale fossils b. Tollund Man. c. lake bed deposits d. fallen meteorites 103. A natural cast forms when an organism a. is trapped in tree resin, which hardens around it b. leaves an impression in sediment that fills with minerals c. has hard structures that are surrounded by minerals d. becomes encased whole in a material that preserves it. 104. Fossils that are useful for dating, because they are common, easy to identify, widespread, and existed for a brief time are called a. trace fossils. b. extinct fossils. c. index fossils. d. key fossils. 105. Earth’s history is organized by a. the Precambrian time scale. b. units representing one million years. c. the geologic time scale. d. which plants lived on Earth. 106. Which of the following is the longest time span in Earth’s history? a. Mesozoic Era b. Quaternary Period c. Precambrian Time d. Paleozoic Era 107. Which of the following periods make up the Mesozoic era? a. Paleozoic, Cenozoic, Precambrian b. Cambrian, Ordovician, Silurian c. Quaternary, Tertiary, Triassic d. Triassic, Jurassic, Cretaceous 108. The evolution of primates occurred in which of the following time periods? a. Cenozoic Era b. Mesozoic Era c. Paleozoic Era d. Precambrian Time 109. Which of the following contributed most to the intense heat of the Hadean eon? a. clouds of carbon dioxide, hydrogen, and other gases b. frequent collisions with asteroids and meteorites c. lightning strikes and volcanic eruptions d. closer proximity to the sun than is now the case 110. In the lipid membrane hypothesis, it is proposed that liposomes a. formed in chimney-like structures at ocean hydrothermal vents. b. were the result of lightning striking early Earth. c. acted as barriers between organic molecules and the environment. d. served as the genetic material on early Earth. 111. Stanley Miller and Harold Urey were the first to demonstrate that a. the earliest genetic material was RNA, rather than DNA. b. meteorites contain amino acids, many of which exist on Earth. c. Earth formed from a nebula approximately 4.6 billion years ago. d. organic molecules can be formed from inorganic molecules. 112. Which of the following hypotheses proposes that early organic molecules formed near ocean hydrothermal vents? a. iron-sulfide bubbles hypothesis b. lipid membrane hypothesis c. RNA world hypothesis d. meteorite hypothesis 113. What discovery supports the hypothesis that RNA was the genetic material in the earliest organisms? a. Ribozymes are RNA that can selfreplicate. b. DNA does not require enzymes to replicate. c. RNA stores genetic information on ribozymes. d. Chains of RNA will form lipid membranes. 114. What is the approximate age of the oldest known fossils? a. 4.6 billion years b. 3.5 billion years c. 3.8 million years d. 1.8 million years 115. When one organism lives inside the body of another, and both benefit, the relationship is called a. photosynthesis. b. permineralization. c. mutation. d. endosymbiosis. 116. The fossil evidence indicates that anaerobic prokaryotes were a. the first living organisms. b. a source of genetic variation. c. not capable of photosynthesis. d. always found in colonies. 117. The theory of endosymbiosis states that large prokaryotes took up smaller simple prokaryotes that became a. the cellular nucleus. b. complex amino acids. c. mitochondria and chloroplasts. d. mitochondria and nuclei. 118. Asexual reproduction produces offspring with a. half of a single parent’s genes. b. the same genes as the parent. c. a mix of genes from two parents. d. lots of genetic variation. 119. The rapid diversification of species that occurred in the early Paleozoic era is called the a. Paleozoic radiation. b. Cambrian explosion. c. Cretaceous mass extinction. d. Cenozoic evolution. 120. Which of the following events ended the Paleozoic era? a. mass extinction b. earthquake c. meteorite d. land plants 121. The earliest ancestors of mammals first appeared during the a. Paleozoic era. b. Precambrian Time. c. Mesozoic era. d. Cambrian explosion. 122. The mass extinction event that is theorized to have killed many species, including the dinosaurs, occurred at the end of which period? a. Permian b. Tertiary c. Jurassic d. Cretaceous 123. During the Cenozoic era, which group of organisms underwent the most dramatic radiation? a. true birds b. mammals c. ray-finned fish d. flowering plants 124. What group of animals has flexible hands and feet, large brains in relation to body size, forward-looking eyes, and arms that can rotate in a circle around the shoulder joint? a. arthropods b. mammals c. vertebrates d. primates 125. What group is the oldest living primate group? a. prosimians b. hominids c. hominoids d. anthropoids 126. Hominids include which of the following organisms? a. orangutans b. chimpanzees c. humans d. gorillas 127. Which of the following distinguishes the genus Homo from the genus Australopithecus? a. Its fossils were found in Africa. b. Its limbs were humanlike. c. Its brain was much larger. d. Its thumb opposed its other fingers. 128. Which of the following statements is correct? a. Modern humans evolved from chimpanzees. b. Homo sapiens has the largest brain of any hominid so far. c. Modern humans arose about 200,000 years ago. d. Humans are the only living bipedal species. 129. The correct order for the levels of Linnaeus’s classification system, from general to specific, is a. kingdom, species, class order, family, genus, phylum. b. kingdom, phylum, class, order, family, genus, species. c. phylum, kingdom, family, class, order, genus, species. d. species, genus, kingdom, family, order, class, phylum. 130. Which of the following is correctly written in the binomial nomenclature system? a. Canis lupus b. Red wolf c. Ailurus Fulgens d. kingdom 131. Which of the following taxa would generally contain the most members? a. order b. species c. phylum d. class 132. Which phrase best describes the Linnaean classification system? a. Each genus contains one species. b. The taxa are interchangeable. c. There is only one kingdom. d. Each level includes the more specific levels below. 133. One limitation of the Linnaean classification system is that it a. allows scientists to discuss organisms. b. is based on physical characteristics alone. c. organizes organisms into groups. d. does not use organisms’ common names. 134. The evolutionary history for a group of species is called a a. clade. b. phylogeny. c. convergence. d. taxonomy. 135. The embryos of both mammals and reptiles are protected by amniotic fluid. What is this type of trait called? a. cladogram b. outgroup c. derived character d. molecular evidence 136. Cladistics is a classification system based on a. nomenclature. b. dichotomous keys. c. common ancestry. d. physical characteristics. 137. In a cladogram, what represents the most recent common ancestor shared by a clade? a. a mark by the clade’s derived character b. the overlapping of one clade upon another c. the longest branch d. the node (point) where branches meet 138. Which of the following would be considered the strongest evidence that two species are related to one another? a. common structures b. shared taxon c. similar genes d. same extinction pattern 139. Woese separated the kingdom Monera into the following two kingdoms: a. Eukarya and Bacteria. b. Archaea and Prokaryote. c. Prokaryote and Eukaryote. d. Bacteria and Archaea. 140. Which of the following lists the three domains accepted by most scientists? a. Bacteria, Protista, and Eukarya b. Bacteria, Fungi, and Protista c. Eukarya, Archaea, and Bacteria d. Archaea, Prokaryote, and Eukaryote 141. Which description distinguishes eukaryotes from prokaryotes? a. Eukaryotes have a cell wall. b. Eukaryotes are multicellular. c. Eukaryotes are photosynthetic. d. Eukaryotes have a nucleus. 142. Single-celled prokaryotes that are classified by their ability to survive extreme conditions are a. fungi. b. archaea. c. protists. d. eukaryotes. 143. What characteristic of fungi makes them different from plants? a. They grow only in shade. b. They have a different cell membrane. c. They are always unicellular. d. They are prokaryotes, not eukaryotes.