The structures labeled "D" in the accompanying figure _____
a. prevents movement of materials between cells
b. allows passage of a signal to contract heart muscles
c. allows the free passage of materials between cells
d. is found mostly in stomach tissue
e. is found in most tissues except heart muscle
ANSWER: b
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Gene rearrangement is responsible for the generation of the various antibody molecules
Indicate whether this statement is true or false.
Estimates of spontaneous mutation rates are made using dominant disorders because
A) it takes several generations for the phenotype to change. B) they do not affect offspring. C) the mutant phenotype is obvious. D) they can be identified by DNA sequencing.
Which vitamin deficiency is correctly paired with the condition it causes?
a. vitamin D deficiency: in bone hardening b. vitamin K deficiency: in decreased blood clotting time c. vitamin D deficiency: in anemia d. vitamin K deficiency: in increased blood clotting time
Identify the biotic factor of an ecosystem among the following options
A) Amount of nitrogen available for the moss to grow on cliffs B) Nesting spots on the edge of a cliff that birds can use C) Average wind forces that the cliffs withstand daily D) Amount of moss available to the consumers