Which of the following is likely to have the most toxic side effects to humans?
A. Inhibitors of protein synthesis
B. Inhibitors of DNA synthesis
C. Disrupters of cell membrane structure
D. Inhibitors of cell wall synthesis
Answer: C
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GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What effect does this mutation have on the population's mean fitness?
A. As the frequency of the GGC codon increases, the population's mean fitness level will remain the same.
B. As the frequency of the GGC codon increases, the population's mean fitness level will initially increase, but once GGC and GGG occur with equal frequency, the mean fitness will decrease.
C. As the frequency of the GGC codon increases, the population's mean fitness level will decrease.
D. As the frequency of the GGC codon increases, the population's mean fitness level will increase.
In thermodynamic studies, energy changes are analyzed in a collection of matter called a ________. All other matter in the universe is called the ________.
Fill in the blank(s) with the appropriate word(s).
This young seedling
a. is a monocot. b. is a eudicot. c. is a magnoliid. d. could be either a monocot or a dicot. e. is none of these.
Which cells stimulate B cells to divide and produce antibodies?
a. mast cells b. macrophages c. NK cells d. TC cells e. TH cells