Name___________________
Ch 14 & 16 homework (1 point each unless otherwise stated)
Ch 14
1) A biological species is defined as a group of organisms that
A) are physically similar.
B) are genetically similar.
C) share a recent common ancestor.
D) live together in a location and carry out identical ecological roles.
E) have the potential to interbreed in nature and produce fertile offspring.
2) Which provides the most general and correct description of the idea of a reproductive barrier?
A) any feature (of geography, behavior, or morphology) that keeps one species from mating with
another
B) a biological difference between two species that prevents them from successfully interbreeding
C) a geographic barrier that separates two species and prevents gene flow between them
D) a difference in reproductive biology between two species that makes hybrid individuals less
fertile
E) a difference in behavior that keeps two species from interbreeding
3) Which of the following types of reproductive barriers separates a pair of species that could interbreed
except that one mates at dusk and the other at dawn?
A) temporal isolation
B) habitat isolation
C) behavioral isolation
D) mechanical isolation
E) gametic isolation
4) Which of the following types of reproductive barriers separates two flowering plant species that could
interbreed except that one has a deep flower tube and is pollinated by bumblebees, whereas the other
has a short, narrow flower tube and is pollinated by honeybees?
A) temporal isolation
B) habitat isolation
C) behavioral isolation
D) mechanical isolation
E) gametic isolation
D) mechanical isolation
E) gametic isolation
5) A zebra and a donkey mate and have an zebroid offspring. The zebroid is vigorous but sterile. This is
an example of
A) mechanical isolation.
B) gametic isolation.
C) reduced hybrid fertility.
D) reduced hybrid viability.
E) hybrid breakdown.
6) Explain a prezygotic and postzygotic barrier.
7) What does the term punctuated equilibrium describe?
8) The Darwin’s finches on the Galapagos islands demonstrate adaptive radiation. Using them as an
example, explain how adaptive radiation leads to speciation.
9) Compare and contrast allopatric and sympatric speciation.
Ch 16
1. What are 4 differences between Archea and Bacteria
2. What are the three shapes of Prokaryotes- draw each shape
3. Gram-negative bacteria stain______________ whereas gram-positive bacteria
stain______________ (what color?) What accounts for this difference (why do they
stain different colors?) (2 points)
4. Chemoautotrophic bacteria obtain their carbon from ________ and their energy from
________ .
A) CO2 . . . sunlight
B) CO2 . . . reactions involving inorganic chemicals
C) methane . . . sunlight
D) organic molecules . . . enzymes
E) organic molecules . . . sunlight
5. Cyanobacteria
A) are photosynthetic archaea.
B) are eukaryotes and are the earliest type of algae.
C) are chemoautotrophs.
D) are of the same nutritional type as the earliest forms of life.
E) are the only prokaryotes with plantlike oxygen-generating photosynthesis.
6. How do endosymbiosis and secondary endosymbiosis differ?
7. Alveolates are characterized by
A) membrane-enclosed sacs under the plasma membrane.
B) membrane-enclosed nuclei, each with more than one nucleolus.
C) mitochondria that do not have an outer mitochondrial membrane.
D) flagella that lack microtubules.
E) abundant ribosomes that pack the cytoplasm.
8. Where would a halophile live? An thermophile?
9. Name two types of stramenpiles