Question 1

If A = (1, 2, 3) and B = (3, 4, 5) how many elements are in the intersection of A and B?

Options :

A : 0

B : 1

C : 3

D : 5

Answer: B

Question 2

Which of the following is found in prokaryotic cells only?

Options :

A : DNA

B : Ribosomes

C : Nucleoid region

D : Golgi apparatus

E : Cytoplasm

Answer: C

Question 3

Guard cells are kidney-shaped cells surrounding the stomata on the underside of leaves. These cells

change their shape according to the amount of water that exists within them. The more water within, the

more swollen the guard cells are and the stomata open. When water is sparse the guard cells shrivel and

close the stomata. Recent evidence suggests that there are blue-light receptors on the plasma membrane

surface of guard cells that are coupled to potassium (K+) ion channels. K+ ions are normally found in high

concentration outside guard cell membranes when the channels are closed.

What mechanism may account for the fact that guard cells are usually open during the day and closed at

night?

Options :

A :

Photosynthesis uses K+ ions; therefore, lower concentrations of potassium within the leaf drive the

movement of K+ into the leaf through the guard cells.

B :

The presence of sunlight drives K+ into guard cells, while driving water out of the guard cells and

opening the stomata.

C : There is more water in the air during daylight hours than during nighttime hours.

D : K+ ions enter the cell through active transport only when enough water is present.

E :

The presence of sunlight opens the K+ ion channels, driving potassium inside, and causing water to

follow by osmosis, swelling the guard cells.

Answer: A

Question 4

Mendel studied the following three traits: seed shape, flower position, and stem length.

CLEP-Science-and-Mathematics-page205-image63

If a plant that is heterozygous for seed shape and stem length traits self-fertilizes, the proportion of offspring

that will be homozygous for both traits is

Options :

A : 1/16

B : 1/4

C : 1/2

D : 3/4

E : 1/8

Answer: A

Question 5

In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly

affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments

than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of

water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO

concentration and distribution. An experiment was done to study the effect of different salinity levels on DO

in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt)

and is the content of dissolved salt in water.

CLEP-Science-and-Mathematics-page205-image13

The oxygen that is dissolved in the water is used by aquatic organisms for

Options :

A : photosynthesis

B : cellular respiration

C : digestion

D : dehydration synthesis

E : chemosynthesis

Answer: B

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