SAT Subject Biology E/M Practice Test 3: Part B

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Question 20 questions

Time 15 minutes

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1. Which of the following contains blood poor in oxygen?

I. Right ventricle

II. Pulmonary vein

III. Pulmonary artery

A. I only
B. II only
C. III only
D. I and II only
E. I and III only

2. An organism appears to be a segmented worm. Upon observation it is determined that the organism has a closed circulation, a mouth and an anus, and does NOT have an exoskeleton. The organism most likely belongs to the phylum

A. mollusca
B. annelida
C. echinodermata
D. arthropoda
E. chordata

3. Which of the following substances are produced by the light reactions of photosynthesis?

A. ATP and NADPH
B. ATP and glucose
C. NADH and glucose
D. ATP and NADH
E. NADPH and glucose

4. Consider the following graph of substrate concentration vs. product formation. Assume enzyme concentration to be constant. Why does the graph level off at high substrate concentrations?

A. All the enzyme is used up, and product formation cannot occur without it.
B. There is no more substrate to be converted into product.
C. Substrate concentration, exceeds enzyme concentration, and all active sites are saturated.
D. The reaction has run to completion.
E. An inhibitor has been added, and it has slowed down the rate of product formation.

5. A bird that feeds on both insects and berries would be classified as a

I. primary consumer

II. secondary consumer

III. tertiary consumer

A. I only
B. II only
C. III only
D. I and II only
E. II and III only

6. Which of the following chemical formulas could represent a monosaccharide?

A. C6H6O6
B. C3H6O3
C. C6H12O3
D. C5H10O10
E. CH2O4

7. A population of birds lives in an area with many insects upon which it feeds. The insects live inside trees, burrowing into the bark. Over many hundreds of years, the average beak size in the bird population has increased. This is due to

A. increased fitness of the birds, leading to speciation
B. decreased fitness of the insects, allowing the birds to catch them more easily
C. increased fitness of large-beaked birds, leading to evolution
D. decreased fitness of small-beaked birds, leading to speciation
E. random mutation and genetic recombination

8. The location on an enzyme where a substrate binds is called the

A. binding site
B. reaction center
C. allosteric site
D. lock-and-key model
E. active site

9. Human cells maintain concentration gradients across their plasma membranes, such that there is a high sodium concentration outside the cell and a high potassium concentration inside the cell. Suppose that within the cell membrane are sodium "leak" channels. These channels would allow sodium to

A. move out of the cell by simple diffusion
B. move into the cell by simple diffusion
C. move out of the cell by facilitated diffusion
D. move into the cell by facilitated diffusion
E. move into the cell by active transport

10. The role of decomposers in the nitrogen cycle is to

A. fix atmospheric nitrogen into ammonia
B. incorporate nitrogen into amino acids and organic compounds
C. convert ammonia to nitrate, which can then be absorbed by plants
D. denitrify ammonia, thus returning nitrogen to the atmosphere
E. release ammonia from organic compounds, thus returning it to the soil

11. All of the following are true about the endocrine system EXCEPT

A. it relies on chemical messengers that travel through the bloodstream
B. it is a control system that has extremely rapid effects on the body
C. the hormones affect only certain "target" organs
D. it is involved in maintaining body homeostasis
E. its organs secrete hormones directly into the bloodstream, rather than through ducts

12. Two organisms live in close association with each other. One organism is helped by the association, whereas the other is neither helped nor harmed. Which of the following terms best describes this relationship?

A. Mutualism
B. Commensalism
C. Symbiosis
D. Parasitism
E. Predator-prey relationship

13. Cardiac output (the amount of blood pumped out of the heart in one minute) and blood pressure are directly proportional. Which of the following graphs best depicts the relationship between cardiac output and blood pressure?

A. img alt="" src="images/Prin_9780307945723_epub_201_r1.jpg"/>
B. img alt="" src="images/Prin_9780307945723_epub_202_r1.jpg"/>
C. img alt="" src="images/Prin_9780307945723_epub_203_r1.jpg"/>
D. img alt="" src="images/Prin_9780307945723_epub_204_r1.jpg"/>
E. img alt="" src="images/Prin_9780307945723_epub_205_r1.jpg"/>

14.

Location where male haploid cells are produced

A. 1
B. 2
C. 3
D. 6
E. 8

15.

Sticky structure where pollen grains can attach and germinate

A. 1
B. 2
C. 4
D. 6
E. 8

16.

Structure which, when fertilized, develops into fruit

A. 1
B. 2
C. 5
D. 6
E. 8

17. Tropisms refer to movements made by plants toward or away from certain stimuli. "Positive" tropisms refer specifically to movements toward a stimulus, whereas "negative" tropisms refer to movements made away from a stimulus.

A plant growing on the shady side of a building bends around the corner of the building toward the sunlight. This is an example of

A. negative geotropism
B. negative phototropism
C. positive phototropism
D. positive hydrotropism
E. negative hydrotropism

18. Tropisms refer to movements made by plants toward or away from certain stimuli. "Positive" tropisms refer specifically to movements toward a stimulus, whereas "negative" tropisms refer to movements made away from a stimulus.

The stem and leaves of the plant grow up, away from the soil. This is an example of

A. negative geotropism
B. positive geotropism
C. negative phototropism
D. positive hydrotropism
E. negative hydrotropism

19.

The hormone labeled X in the diagram is often used in over-the-counter diagnostic tests to determine when ovulation has occurred. This hormone is

A. estrogen
B. progesterone
C. FSH
D. LH
E. testosterone

20.

Based on the peak levels of hormone X, on what day of the cycle is ovulation most likely to occur?

A. Day 21
B. Day 14
C. Day 12
D. Day 25
E. Day 28