CLEP Biology 5

Question 1

Which scientists are credited with proposing the double-helix structure of DNA?

Accepted Answer

Watson and Crick

Answer

Watson and Crick proposed the DNA double-helix model in 1953.

Question 2

What is the final electron acceptor in aerobic cellular respiration?

Accepted Answer

Oxygen

Answer

Oxygen accepts electrons at the end of the electron transport chain, forming water.

Question 3

A mutation that changes a single nucleotide and results in a premature stop codon is called a:

Accepted Answer

Nonsense mutation

Answer

A nonsense mutation creates a premature stop codon, truncating the protein.

Question 4

Which type of plant tissue is responsible for transporting water from roots to leaves?

Accepted Answer

Xylem

Answer

Xylem conducts water and dissolved minerals upward from roots.

Question 5

In humans, which structure prevents food from entering the trachea during swallowing?

Accepted Answer

Epiglottis

Answer

The epiglottis folds over the trachea to direct food into the esophagus.

CLEP Practice Test