Second messengers

A. are necessary for all receptor signal transduction mechanisms.
B. act in the cell cytoplasm.
C. are always proteins.
D. always function to activate enzymes.
E. only function as intercellular messengers.


Answer: B

Anatomy & Physiology

You might also like to view...

The ingestion of a meal high in fat content would cause which of the following to occur?

A) This type of food would cause secretion of gastrin to cease, resulting in faster gastric emptying. B) Increased production of trypsinogen. C) Bile would be released from the gallbladder to emulsify the fat in the duodenum. D) The acid secretions from the stomach would be sufficient to digest this food but may cause heartburn.

Anatomy & Physiology

Which muscle allows you to roll your eyes upward, as in a look of disgust?

A. Superior oblique B. Inferior oblique C. Inferior rectus D. Superior rectus E. Lateral rectus

Anatomy & Physiology

If half of a DNA molecule is ACG-TCC-GTA, the complementary half would be

A. UGC-AGG-CAU. B. ACG-TCC-GTA. C. TGC-AGG-CAT. D. CTA-CTT-ACC.

Anatomy & Physiology

Which statement is false about MHC and APC?

A. Epitopes are displayed on an MHC protein on the surface of the APC. B. MHC protein displays what is self and what is foreign. C. MHCs process antigens and APCs present what was processed. D. If the epitope in the MHC is foreign a specific immune response is initiated.

Anatomy & Physiology