Retinoblastoma is caused by mutation in Rb gene, and its cell of origin is (A)_________. In normal cells, Rb protein inhibits E2F dependent transcription, thus inhibits entry of (B)____________.

a. (A) Cone, (B) S phase
b. (A) Cone, (B) G2 phase
c. (A) Rod, (B) S phase
d. (A) Rod, (B) G2 phase


Answer: a. (A) Cone, (B) S phase

Biology & Microbiology

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Which one of the following is NOT a component of each monomer used to make proteins?

A) a phosphorus atom, P B) an amino functional group, NH2 C) a side chain, R D) a carboxyl group, COOH

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In eukaryotic cells organelles are suspended within _________.

a. golgi b. matrix c. chitin d. cytosol e. none of the above.

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The transformation of humans from hunter-gatherer societies to agriculturally based ones occurred

approximately _____.

a. 14,000 years ago b. 11,000 years ago c. 7,000 years ago d. 1,500 years ago e. 200 years ago

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The neurons that are located in the brain and spinal cord are ____

a. motor neurons b. sensory neurons c. integrator neurons d. interneurons e. glial cells

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