Release of thyroid-stimulating hormone (TSH) from the pituitary is inhibited when:
A) blood sugar levels are high.
B) blood sugar levels are low.
C) T3 and T4 levels are low.
D) T3 and T4 levels are high.
E) the metabolic rate of cells decreases.
Answer: D
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Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.
What is a characteristic of most fish in the clade Osteichthyes?
a. ossified skeleton b. longitudinal nerve cords c. cartilaginous skeleton d. cutaneous respiration
When the growth rate of a population tapers off at a certain point and remains at the same point indefinitely, the population is said to have reached the
A. maximum population size. B. carrying capacity. C. biotic potential. D. lag phase.
A group is considered monophyletic if
A. all members share homoplastic traits. B. not all descendants of the common ancestor are included. C. it is the most parsimonious grouping. D. all members of the group share a common ancestor that is included in the group. E. the group does not contain the most recent common ancestor.