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1

1. All of the following are characteristics of life EXCEPT
a. evolution. c. homeostasis.
b. reproduction. d. multicellularity.

D

2

2. Which property of life can a scientist directly observe in a single plant
fossil?
a. Homeostasis c. Energy use
b. Organization d. Growth

B

3

3. Which of the following lists is ordered from smallest (least inclusive)
to largest (most inclusive)?
a. Cell < Tissue < Organelle < Individual < Community
b. Community < Population < Ecosystem < Biosphere
c. Organelle < Cell < Organ < Individual < Population
d. Individual < Ecosystem < Community < Biosphere

C

4

4. Because plants extract nutrients from soil and use sunlight as an
energy source, they are considered to be
a. autotrophs.
b. consumers.
c. heterotrophs.
d. decomposers.

A

5

5. Evolution through natural selection will occur most rapidly for
populations of plants that
a. are already well adapted to the environment.
b. live in an unchanging environment.
c. are in the same genus.
d. reproduce sexually and live in an unstable environment.

D

6

6. Which of the following statements is true?
a. Two of the three domains contain eukaryotes.
b. The three main branches of life are animals, plants, and fungi.
c. Humans and plants share the same domain.
d. Two species in the same genus can be in different domains.

C

7

7. In an experiment to test the effect of temperature on the rate of
bacterial reproduction, temperature would be the
a. standardized variable.
b. independent variable.
c. dependent variable.
d. control variable.

C

8

8. What is the role of a placebo in medical research?
a. It ensures that all patients in a study have the same illness.
b. It is the highest possible value of the dependent variable.
c. It is a standardized treatment given to all patients.
d. It is given to some patients as a control.

D

9

Can a theory be proven wrong?
a. No, theories are the same as facts.
b. No, because there is no good way to test a theory.
c. Yes, a new observation or interpretation of data could disprove a
theory.
d. Yes, theories are the same as hypotheses.

C

10

10. Which of the following questions cannot be answered using the
scientifi c method?
a. What was the fi rst living organism on Earth?
b. Does a particular gene infl uence aging in mice?
c. How does migration affect the reproductive success of monarch
butterfl ies?
d. How does coastal development affect wetland biodiversity?

A

11

The mass number of an atom represents the total number of
a. electrons. c. neutrons.
b. protons. d. protons + neutrons.

D

12

The atomic number of the element neon (Ne) is 10. How many
electrons does a neutral atom of neon contain?
a. 5
b. 10
c. 20
d. It can’t be determined from this information.

B

13

A covalent bond forms when
a. electrons are present in a valence shell.
b. a valence electron is removed from one atom and added to another.
c. a pair of valence electrons is shared between two atoms.
d. the electronegativity of one atom is greater than that of another
atom.

C

14

The atomic number of silicon (Si) is 14. Use the idea of energy shells
to predict the number of covalent bonds that Si could form.
a. 2 c. 4
b. 3 d. 8

C

15

An ionic bond forms when
a. an electrical attraction occurs between two atoms of different
charge.
b. a nonpolar attraction is formed between two atoms.
c. a valence electron is shared between two atoms.
d. two atoms have similar electronegativity.

A

16

A hydrophilic substance is one that can
a. form covalent bonds with hydrogen.
b. dissolve in water.
c. buffer a solution.
d. mix with nonpolar solvents.

B

17

What type of chemical bond is being broken when methane is burned?
a. Ionic c. Polar covalent
b. Hydrogen d. Nonpolar covalent

D

18

What type of chemical bond forms during a dehydration synthesis
reaction?
a. Covalent c. Hydrogen
b. Ionic d. Polymer
9

A

19

A sugar is an example of a __________ molecule, whereas DNA is a
__________ .
a. protein; nucleic acid c. lipid; protein
b. nucleic acid; lipid d. carbohydrate; nucleic acid

D

20

The shape of a protein is determined by
a. the sequence of amino acids.
b. chemical bonds between amino acids.
c. temperature and pH.
d. All of the above are correct

D