A "5? cap":

a. prevents translation.
b. prevents the binding of ribosomes.
c. marks the mRNA for degradation.
d. is added to mRNA but not pre-mRNA.
e. protects mRNA from degradati


E

Biology & Microbiology

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The most common limit to plant growth is a lack of

a. phosphorous. b. carbon. c. hydrogen. d. oxygen. e. nitrogen.

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The letter “A” in the above figure represents

a. trigger zone. b. output zone. c. input zone. d. conducting zone. e. none of these.

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What is the role of the histone proteins of the chromatin?

A) They contain the instructions to build a protein. B) They act as a spool around which the DNA is wrapped. C) They help assemble ribosomes. D) They maintain the nuclear membrane.

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Any gene, when mutated, that leads to an organism with structures in abnormal or unusual places, is referred to as a(n) ________________ gene.

A. Heterotic B. Vestigial C. Homeotic D. Mutagenic E. Embryotic

Biology & Microbiology