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Which of the following nucleotides is only found in RNA?

A. Guanine

B. Thymine

C. Uracil

D. Adenine

Answer Explanation:

Uracil is the nucleotide that is only found in RNA. The other nucleotides are found in both DNA and RNA

Therefore, the Correct Answer is C.

Q #1: Which of the following types of cells stimulates other immune cells to attack and destroy foreign agents?

A. Cytotoxic T-cells

B. Plasma cells

C. Natural killer cells

D. Helper T-Cells

Answer Explanation

Helper T cells are important cells that stimulate the action of other immune cells. For instance, they not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
Q #2: Which of the following distinguishes endocrine and exocrine glands from another?

A. The presence or absence of ducts

B. The effect their secretions have on the target cells

C. The biochemistry of their secretions

D. The presence or absence of nerve innervation

Answer Explanation

Exocrine glands secrete their products into ducts that carry them to the target organs. In contrast, endocrine glands secrete their products directly into the bloodstream, which carries them to target cells throughout the body.
Q #3: The "gray matter of the brain is largely made up of which of the following?

A. Neuron cell bodies

B. Meninges

C. Neuron cell axons

D. Corpus callosum

Answer Explanation

The gray matter of the brain primarily consists of neuron cell bodies, along with dendrites, glial cells, and unmyelinated axons. It appears gray because it lacks the white fatty myelin sheath that covers many nerve fibers.

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