Scientists suspect that the first macromolecules to form when cells first arose were

A. enzymes.
B. RNA.
C. DNA.
D. polysaccharides.


Answer: B

Biology & Microbiology

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In which stage of meiosis do homologous chromosomes separate from each other?

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In ? phage, which protein, the product of the cI gene, blocks the transcription required to initiate the lytic cycle?

A) cro B) repressor C) enhancer D) integrase E) operator

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What type of growth does a plant exhibit when its trunk gets thicker?

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Many poisonous snakes share warning colors of red, yellow, and black. This is an example of:

a. Batesian mimicry. b. mutualism. c. camouflage. d. Müllerian mimicry. e. character displacement.

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