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CLEP Natural Sciences Exam Practice Test 3
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CLEP Natural Sciences Exam Practice Test 3
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25 Questions

1. If an atom could be viewed with a microscope, an observer would note that the atom is mainly
2. Wave interference occurs when two waves meet. If those two waves are identical and in phase, the resultant wave will double in
3. When studying populations, scientists often calculate the effective population size using the following equation: is the number of breeding males and Nf is the number of breeding females. Which of the following would have the greatest effective population size?
4. An example of the method of heat transfer known as conduction is
5. In humans, the kidney is composed of many basic units that filter blood and produce urine known as
6. In the human circulatory system, blood from the upper part of the body flows into the heart via the
7. Which of the following statements are true of the membranes that surround the cells of most organisms?
I.Membranes contain lipids with hydrophilic tails.
II.Membranes prevent any molecules from entering the cell.
III.Membranes are composed of two layers.
8. Which of the following statements are true of lunar eclipses?
I.They occur during a new moon.
II.They occur when the Moon casts a shadow on Earth.
III.They occur when Earth, Moon, and Sun align.
9. In a breed of dog, the dominant B gene corresponds to black fur, while the recessive b gene corresponds to brown. What proportion of offspring would be heterozygous in a cross between a parent with a BB genotype and one with a Bb genotype?
10. Which of the following events occurs during mitotic prophase?
11. Protons and neutrons are composed of quarks. Which of the following quark combinations would be found in a neutron?
12. It is generally accepted that organisms evolve through natural selection. Which of the following is the best definition of natural selection?
13. Biologists typically classify the distribution of populations as uniform, random, or clumped. Which of the following would most likely have a random distribution?
14. Which of the following statements are true of the developmental process known as incomplete metamorphosis?
I.It is how butterflies develop.
II.It includes a nymph stage.
III.It includes a pupa stage.
15. According to Ohm’s law, what is the voltage of a toaster if the circuit has 39 Ω of resistance and 11 amperes of current?
16. Which of the following statements are true of quasars?
IThey are fainter than galaxies.
II.They emit radio waves.
III.They are young elliptical galaxies.
17. All of the following statements are true of the inner planets EXCEPT
18. Based on the bond energy values provided below, what amount of energy is required to break the chemical bonds in the reaction 3H2 + N2 → 2NH3?
19. The principle of relative dating used by Earth scientists that states that higher layers of sedimentary rock are younger than lower ones is known as
20. When studying the distributions of populations, scientists often consider not only crude density but also ecological density. Which of the following statements is correct regarding the relationship between crude and ecological density?
21. The process of photosynthesis carried out within cells is often divided into light and dark reactions. Which of the following occurs during the dark reactions of photosynthesis?
22. Which of the following eras of Earth’s history is also known as the “age of the mammals”?
23. The kingdom Animalia consists of both protostomes and deuterostomes. Which of the following statements are true of protostomes?
I.They have bilateral symmetry.
II.During embryonic development, the opening that develops first is the mouth.
III.They comprise the phylum Echinodermata.
24. Which of the following is an example of an acid-base reaction?
25. The bone of the human arm that extends from the elbow to the side of the wrist closest to the thumb is the

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