What purpose do restriction enzymes play in bacterial cells?
a. Restriction enzymes prevent the overproduction of mRNA in the bacterial cell.
b. Restriction enzymes attack bacteriophage DNA when it enters the cell.
c. Restriction enzymes promote bonding of the RNA polymerase to the promoter.
d. Restriction enzymes limit the rate of bacterial replication.
e. Restriction enzymes connect Okazaki fragments.
B
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The evolution of photosynthesis involved __________
A. convergent evolution B. endosymbiosis C. horizontal gene transfer D. convergent evolution and endosymbiosis E. horizontal gene transfer and endosymbiosis
Alternation of generations means:
A. One phase of the life cycle takes place on land and the other in water. B. One phase of the life cycle is photosynthetic and the other is heterotrophic. C. One phase of the life cycle is diploid and the other is haploid. D. One phase of the life cycle is unicellular and the other is multicellular. E. One phase of the life cycle is motile and the other is stationary.
In some amniotes, which of the following is a waste product of nitrogen metabolism that is low enough in toxicity that it can be excreted as a semisolid paste, thus reducing water loss?
a. uric acid b. nitric oxide c. ammonium d. squalene
A breakfast cereal is advertised as containing essential vitamins and minerals. In this context, the word essential means __________.
a. that the substances contain the "essence" of the vegetables from which they are extracted b. that they are the nutrients that should comprise the largest component of our diet c. that they are necessary for life d. that the nutrients must be supplied in the diet and cannot be made in the body e. nothing: this is just a gimmick