Answer the question using the accompanying figure. At which point in this action potential diagram does the K+
channel close to stabilize the membrane potential?
a. A
b. B
c. C
d. D
e. E
ANSWER: e
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Many organisms used in modern agriculture are a result of artificial selection
Indicate whether the statement is true or false
Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. Kidneys that are extremely good at producing a concentrated urine B. Body fluid concentrations that are similar to or greater than those of seawater C. The ability to secrete salts and wastes into their intestinal contents like an insect D. They use ammonia as their primary nitrogenous waste E. Salt glands
A recessive allele: Check all that apply.
A. will never have an effect on an organism's phenotype. B. will have no noticeable effects on an organism's phenotype if a dominant allele is present. C. will have an effect on an organism's phenotype if the individual is homozygous for the recessive allele. D. can be on either the maternal or the paternal chromosome.
The chorion of amniotic eggs functions in:
a. supply of food. b. removal of wastes. c. gas exchange. d. protection of the egg. e. absorbing toxins.