The amino acid referred to as the "helix breaker" (because it lacks the hydrogen atom needed for hydrogen bonding) is

A) leucine.
B) proline.
C) methionine.
D) valine.
E) phenylalanine.


B) proline.

Biology & Microbiology

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Many eukaryotic operons are subject to numerous regulatory mechanisms

Indicate whether the statement is true or false.

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Calcium is a mineral that plays an important role in ____

a. producing thyroid hormone b. nerve function c. intercellular signaling d. supporting the hemoglobin molecule

e. maintaining the cell membrane

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HIV has an RNA genome that is converted to DNA when infecting a human immune cell. This type of virus is called a ________

A) bacteriophage B) prion C) retrovirus D) reverse transcriptase

Biology & Microbiology

Arrival of an action potential at a presynaptic cell's axon terminals triggers the release of __________, a type of chemical signal.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology