About twelve to twenty-four hours after the previous meal, a person's blood-sugar level normally varies from 60 to 90
milligrams per 100 milliliters of blood, though it may rise to 130 mg/100 ml after meals high in carbohydrates. That the
blood-sugar level is maintained within a fairly narrow range despite uneven intake of sugar is due to the body's ability to
carry out
a. adaptation.
b. inheritance.
c. metabolism.
d. homeostasis.
e. evolution.
ANSWER: d
You might also like to view...
Changing day length, as well as variations in precipitation and temperature, are environmental cues
that exert an important influence on: a. the kinds of genes a plant has. b. the number of mutations that genes undergo. c. whether a plant is an annual, biennial, or perennial. d. which genes will be expressed in a plant. e. whether a plant reproduces sexually or asexually.
The blueberries found in a typical grocery store have several gene differences compared to wild blueberries. What has caused this difference?
A) natural selection B) artificial selection C) a change in the environment D) genetic engineering
Overexpression of caudal in the early Drosophila embryo, at a level high enough to overcome inhibition by Bicoid protein, would
A. interfere with the development of both anterior and posterior structures. B. interfere with the development of anterior structures. C. have no effect since the cytoplasm has already been determined. D. interfere with the development of posterior structures.
You are studying an individual with very low levels of insulin in her blood. Further analysis indicates that cells of her pancreas are producing normal levels of this protein, but it is accumulating in the cytoplasm rather than being secreted from the cells. Which hypothesis makes the most sense to explain this observation?
A. A chromosomal segment that includes the gene for insulin has been inverted. B. A missense mutation has altered the ribosome-binding sequence at the 5' end of the mRNA. C. A small deletion has removed the nucleotides that code for the signal sequence at the amino terminus of the protein. D. A two-base deletion near the middle of the gene has altered the reading frame during translation of the protein. E. A missense mutation has caused premature termination during translation of this protein.