Photosynthesis occurs chiefly in the leaf's:
a. epidermis.
b. bundle sheath extensions.
c. mesophyll.
d. trichomes.
e. vascular bundles.
C
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Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?
A. They are highly permeable to test substances. B. It is very straightforward to assay the conversion of their histidine auxotrophy mutations to histidine prototrophy. C. They are defective in DNA repair and, therefore, cannot readily repair damage done by the test substances. D. All of the choices are correct.
In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits b. introns are spliced out and combined to form complete proteins c. introns are spliced out and combined in the tRNA d. exons are spliced out and the introns are combined in the mature mRNA e. introns are spliced out and the exons are combined in the mature mRNA
A low number of methyl groups is associatedwith:a
cancer. b. famine. c. chemicals in cigarette smoke. d. cancer and famine. e. all of these.
The K/T event was the transition of plants from water to land.
Answer the following statement true (T) or false (F)