The phylum ________ is thought to represent the oldest branch of the bacteria.
A. Aquificae
B. Thermotogae
C. Cyanobacteria
D. Spirochetes
Answer: A
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Some mutations have no effect on the organism and are therefore considered neutral
A. true B. false
Clues to evolutionary relationships are provided by differences in DNA sequences resulting from ____
a. insertions only b. deletions only c. substitutions only d. both insertions and deletions e. insertions, deletions, and substitutions
Simple goiter can be prevented by
A. administration of insulin. B. administration of ACTH. C. surgery to remove the thyroid gland. D. increasing intake of iodine in the diet. E. removal of the pituitary.
In what way are the senses of taste and smell different?
A. Taste buds contain cilia while olfactory cells contain microvilli. B. Taste depends on a "weighted average" of all the taste messages, while smell depends on the signature of olfactory cells stimulated. C. The sensation of taste occurs in the spinal cord, while the sensation of smell occurs in the cerebral cortex. D. There are hundreds of different tastes but only five different smell families. E. Taste buds are modified neurons and olfactory cells contain a pore with supporting cells and elongated cells.