October 25, 2017

CLEP Natural Sciences Exam Practice Questions

DIRECTIONS:

Each of the questions or incomplete statements below is followed by five possible answers or completions. Select the one that is best for each question.

1. Which of the following is a carbohydrate found in a plant’s primary cell wall?

a. Lignin
b. Chitin
c. Cellulose
d. Plastid
e. Peptidoglycan

2. Sea turtles are large organisms with long life spans if they reach adulthood. They produce large numbers of offspring at once, but do not tend to their offspring. These characteristics of sea turtles are best described as

a. Altruistic
b. R-selected
c. K-selected
d. Neither r-selected nor k-selected
e. Both r-selected and k-selected

3. Sedimentary rocks form due to the layering of clastic or organic materials over time. Which of the following is NOT a type of sedimentary rock?

a. Sandstone
b. Shale
c. Coal
d. Limestone
e. Basalt

4. Which of the following geologic events occurred during the Paleozoic Era?

I. First fish
II. First amphibians
III. First reptiles

a. I only
b. II only
c. III only
d. I and II only
e. I, II, and III

5. The graph below shows the percent of deposit feeders (burrowing animals) and suspension feeders (filter feeders) at 18 sites on a continental shelf. The percent of silt and clay sediment at each site is also given. Use the graph to answer the following question.

Which statement best compares the relationship of suspension feeders and deposit feeders to silt and clay sediment?

a. Deposit feeders rely less on the abundance of silt and clay for survival than do suspension feeders.
b. Deposit feeders rely more on the abundance of silt and clay for survival than do suspension feeders.
c. Deposit and suspension feeders have a similar dependence on the abundance of silt and clay for survival.
d. The abundance of suspension feeders is directly related to the abundance of silt and clay.
e. There is no clear relationship between suspension feeders and deposit feeders and the abundance of silt and clay.

6. Cells are able to use ATP on a regular basis by

a. Storing ATP
b. Adding two phosphate groups to a nucleotide
c. Breaking ATP down into ADP, phosphate, and energy
d. Forming covalent bonds to generate new energy
e. Releasing all its energy at once by breaking pyrophosphate bonds

7. What is the most important consequence of the crossing over that occurs during the prophase stage of meiosis?

a. It promotes variation.
b. It replicates chromosomes.
c. It replicates DNA.
d. It forms daughter cells.
e. It reduces the number of chromosomes.

8. The Sun’s energy is a byproduct of the inefficient reactions of

a. Hydrogen gas to form carbon
b. Hydrogen gas to form helium
c. Helium to form positrons and neutrinos
d. Nitrogen gas to form helium
e. Nitrogen gas to form hydrogen gas

9. A liver cell increases the rate at which glycogen is broken down by

a. Decreasing the catalytic rate of glycogen synthase
b. Increasing the catalytic rate of glycogen synthase
c. Adding a phosphate group to turn off covalent modulation
d. Decreasing the catalytic rate of glycogen phosphorylase
e. Increasing the catalytic rate of glycogen phosphorylase

10. The part of the Moon that is illuminated is dependent on the

a. Position of the Moon and Earth
b. Amount of energy the Moon is emitting
c. Angle between the Earth, Moon, and Sun
d. Earth’s revolution around the Sun
e. Change in Earth’s tilt on its axis

CLEP Natural Sciences Exam Answer Key