The number of protons in an atom is given by the

ATI RN

ATI RN Test Bank

The number of protons in an atom is given by the:

A. mass number B. atomic number C. difference between the atomic number and the mass number D. atomic weight

Correct Answer: B

Rationale: The atomic number defines the number of protons, unique to each element.

The plasma membrane serves to:

A. enclose components of the cell B. regulate absorption C. give shape to the cell D. all of the above

Correct Answer: D

Rationale: The plasma membrane encloses, regulates transport, and shapes the cell.

The sequence of nucleotides in a messenger RNA molecule is determined by the:

A. sequence of nucleotides in a gene B. enzyme RNA polymerase C. sequence of amino acids in a protein D. enzyme ribonuclease (RNase)

Correct Answer: A

Rationale: mRNA sequence is a copy of a gene's DNA sequence (complementary to the template strand).

Classification of epithelia is based on the number of layers of cells and on the:

A. shape B. staining properties C. size D. location

Correct Answer: A

Rationale: Epithelia are classified by layers (simple/stratified) and cell shape (squamous, cuboidal, columnar).

The function of dense, regularly arranged, connective tissue is:

A. elastic recoil B. binding and support C. encapsulation of blood vessels D. articulation

Correct Answer: B

Rationale: Dense regular connective tissue (e.g., tendons) provides strong binding and support.

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