Tumor suppressor genes _____.?

a) encode proteins that help prevent uncontrolled cell growth
b) are cancer-causing genes introduced into cells by viruses
c) are frequently overexpressed in cancerous cells
d) often encode proteins that stimulate the cell cycle


a) encode proteins that help prevent uncontrolled cell growth (can become oncogenes when mutated)

Biology & Microbiology

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What organic compound makes up 25% of the secondary walls of cells of older stems and roots?

a. Cellulose b. Glycogen c. Glucose d. Lignin e. Starch

Biology & Microbiology

Which of the following energy-generating processes is the only one that occurs in all living organisms:

a) glycolysis. b) photophosphorylation. c) the Krebs cycle. d) electron transformer system. e) None of the above. There are no energy-generating processes that occur in all living organisms.

Biology & Microbiology

Bryophytes absorb water and nutrients through

A) rhizomes. B) rhizoids. C) tracheophytes. D) roots. E) mycorrhizae.

Biology & Microbiology

The parietal cells of the stomach are responsible for producing

A) mucus. B) pepsin. C) hydrochloric acid. D) bile.

Biology & Microbiology