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
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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.
The letter “A” in the above figure represents
a. trigger zone. b. output zone. c. input zone. d. conducting zone. e. none of these.
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.
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