Morphological divergence ____
a. is the change in body form from that of a common ancestor
b. is the change in body form to resemble that of an ancestor
c. implies no change in body form over time
d. does not occur in related species
e. only occurs in unrelated species
ANSWER: a
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Which of the following is TRUE regarding the step in gene cloning when bacterial cells take up recombinant vector?
A. The process is known as transformation when a viral vector is used. B. The process is known as transfection when a plasmid vector is used. C. The cell is treated with agents that render it impermeable to the plasmid. D. The cell is treated with agents that render it permeable to the plasmid. E. Most cells will successfully take up one plasmid.
The process illustrated in the figure is a step in
a. the production of recombinant DNA. b. probing for transferred genes. c. DNA fingerprinting. d. sequencing DNA. e. producing radioactive probes.
Sister chromatid exchanges increase in frequency in the presence of X rays, certain viruses, ultraviolet light, and certain chemical mutagens. In what autosomal recessive disorder is there known to be an increase in sister chromatid exchanges?
What will be an ideal response?
Which structure is the growing tip of a plant stem?
A) apical meristem B) axillary bud C) rhizome D) internode