Refer to Figure 12-2. The enzyme represented by the letter D is responsible for:a
linking short DNA segments.
b. synthesizing the leading strand.
c. forming the replication fork.
d. forming nucleosomes.
e. unwinding the DNA double helix.
A
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Which cytoskeletal structures represent a highly diverse group of tension-bearing fibers important to the maintenance of cell shape?
A. microtubules B. intermediate filaments C. microfilaments D. centrioles E. pili
White fruit color in summer squash is influenced by a dominant allele W, while colored fruit must be
ww. In the presence of ww, a dominant gene G results in yellow fruit, and if the individual had both recessive genes in the homozygous condition, it would be green. Give the F2 phenotypic ratios resulting from a cross of a pure-breeding white of genotype WW GG with a green. What will be an ideal response?
The ultimate source of genetic variation within a population is:
a. mutations in DNA. b. adaptation of a species to environmental changes. c. homeostatic mechanisms that compensate for environmental changes. d. a sensory system that can detect an environmental change. e. a system of locomotion that allows an organism to escape environmental changes.
In the presence of glucose, where is the lac repressor bound?
A) lacZ B) lacO C) lacP D) lacI E) The lac repressor is not bound to the operon.