Name _________________________
Chapter 1 homework
1 point each (except #9- 2 points)
Due Wed 6/30/2010
1. Should an experiment test only one variable at a time? Why or why not?
a. Yes, because otherwise the variables could be confused with the control.
b. Yes, so that the experimental outcome is clearly due to one identifiable
variable.
c. No, because it takes much longer to do an experiment if you change only
one variable at a time.
d. As long as the experiment is repeated a sufficient number of times, it
doesn't matter.
e. No, but only if each variable can be measured as a separate observation.
2. To be of value to science, hypotheses must be _____.
a. established facts
b. testable
c. proven correct
d. popular
e. reproducible
3. Which series of terms is in the sequence of biological organization from the
simplest to the most complex?
a. community, population, ecosystem, habitat
b. tissue, organ system, organ, cell
c. organism, ecosystem, community, population
d. cell, tissue, organ, population
e. molecule, tissue, cell, membrane
4. The best method for determining whether bean plants require sodium is to _____.
a. measure the amount of sodium in a few bean plants
b. measure how fast radioactive sodium enters the plant
c. look for sodium in leaf tissues using autoradiography
d. analyze root contents for sodium
e. grow bean plants with and without sodium
5. Local farmers think that a commonly used pesticide is responsible for the increase
in appearance of frogs with an additional appendage. To test this hypothesis, frogs
are injected with a small amount of pesticide mixed in ethanol. The frogs are
allowed to produce offspring to test the effect of the pesticide. Which of the
following would be the best controlled experiment?
a. One group is injected with pesticide.
b. One group is injected with pesticide, and one group is not injected with
anything.
c. One group is injected with ethanol, one group is injected with pesticide,
and one group is not injected with anything.
d. One group is injected with ethanol, and one group is injected with
pesticide.
6. What is the correct order for the hierarchy of biological organization?
a. atom, molecule, organelle, cell, tissue, organ, organ system, organism,
population, community, ecosystem
b. atom, molecule, cell, tissue, organelle, organ, organ system, organism,
population, community, ecosystem
c. atom, molecule, organelle, tissue, cell, organ, organ system, organism,
population, community, ecosystem
d. atom, molecule, organelle, cell, tissue, organ, organ system, organism,
ecosystem, community, population
e. atom, molecule, organelle, cell, tissue, organ, organ system, organism,
population, ecosystem, community
7. An interacting group of individuals of a single type is called a ________________
8. Explain what “emergent properties” are and give an example
9. Rewrite the following statements into a testable hypothesis (1/3 point each)
***Remember to include the relationship between the things that you are testing:
Example: If the depth at which you are fishing affects the type of fish that are
caught than fishing at a deep depth will catch bottom fish.
a. Temperature causes leaf color to change
b. Students who read the chapter before class perform better in class
c. Chocolate causes pimples
d. If a person is in shape, they will have a better pulse than someone who is
not
e. If you are a smoker, does your heart rate take longer to return to resting
rate
f. A pea plant will grow at a constant rate if watered daily
Chapter 2 homework (1 point each)
1. An atom and an ion of the same element differ in the number of _____.
a. Neutrons
b. Protons
c. Electrons
d. either protons or electrons
2. A solution of pH 6 contains ____ than the same of amount of solution at pH 8
a. 2 times more H+
b. 4 times more H+
c. 100 times more H+
d. 4 times less H+
e. 100 times less H+
3. In a group of water molecules, hydrogen bonds form between _____.
a. two hydrogen atoms in different water molecules
b. the oxygen atoms in different water molecules
c. the oxygen atom in one molecule and a hydrogen atom in another
molecule
d. the hydrogen atoms in a single water molecule
e. the oxygen atoms in a single water molecule
4. The atoms in the molecule of water shown below are held together by which type
of bond?
a.
b.
c.
d.
e.
hydrogen bond
ionic bond
polar covalent bond
nonpolar covalent bond
cohesive bond
5. A compound…..
a. Is pure element
b. Is less common than a pure element
c. Contains two or more elements in a fixed ration
d. Is exemplified by sodium
e. is a solution
6. An ion has a different number of _______________ whereas an isotope has a
different number of __________ as compared to a neutral atom.
7. You've made a hot drink by dissolving a teaspoon of instant coffee and a teaspoon
of sugar in a cup of hot water.
a. What kind of solution is this?
b. Identify the solute and solvent
8. A proton has a __________ charge and is found in the __________________. A
neutron has a ______________ charge and is found in the ________________.
An electron has a _________________ charge and is found in the ____________.
9. How are ionic bonds formed?
10. Describe how water helps regulate coastal temperatures. What unique feature of
water makes this possible? Please be specific and relate the chemical properties to
the physical properties.
Chapter 3 homework
1. Dehydration reactions _____. They do so by _____
a. link monomers to form a polymer … adding a water molecule
b. remove monomers from polymers … adding a water molecule
c. link monomers to form a polymer … removing a water molecule
d. remove monomers from polymers ... removing a water molecule
2. In a hydrolysis reaction, _____. In this process, water is _____.
a. a polymer breaks up to form monomers … consumed
b. a monomer breaks up to form polymers … produced
c. monomers are assembled to produce a polymer … consumed
d. monomers are assembled to produce a polymer … produced
e. a polymer breaks up to form monomers … produced
3. The four main categories of macromolecules in a cell are _____.
a. proteins, DNA, RNA, and steroids
b. monosaccharides, lipids, polysaccharides, and proteins
c. proteins, nucleic acids, carbohydrates, and lipids
d. nucleic acids, carbohydrates, monosaccharides, and proteins
e. RNA, DNA, proteins, and carbohydrates.
4. Which is the correct term for compounds that do not mix with water?
a. Phospholipids
b. Hydrophobic
c. Hydrophilic
d. Protein
e. hydrogen bonded
5. The alpha helix and pleated sheet represent which level of protein structure?
a. primary structure
b. secondary structure
c. tertiary structure
d. quaternary structure
e. pentiary structure
6. Match the monomer to the correct macromolecule (place the correct letter in the
blank)
a. Lipids
b. Carbohydrates
c. Proteins
d. Nucleic Acids
______nucleotides
______fatty acids and glycerol
______amino acids
______monosaccharide
7. A fatty acid containing at least two double bonds is called _____.
8. The lipids that form the main structural component of cell membranes are _____.
9. Name the 6 functional groups of organic compounds and include their chemical
formula
10. Describe what an enzyme is. Include it is made of (i.e., proteins, carbohydrates,
lipids or nucleic acids) its function and how it influences chemical reactions in
cells (1pts).