The situation in which an active regulatory protein "turns on" gene expression is an example of
A) feedback inhibition.
B) positive control.
C) negative control.
D) constitutive gene elements.
E) a mutation.
Answer: B
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Gap junctions ____
a. seal the spaces between cells b. allow ions and small molecules to pass between cells c. allow plant cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall
Which of the following is not one of the principal types of surfaces used by animals to facilitate gas
exchange? a. bronchial tubes b. body surface c. gills d. lungs e. tracheal tubes
A group of people whose ancestors immigrated to North America 200 years ago have certain allele frequencies that differ significantly from those in surrounding populations in the United States. Which of the following is the most likely explanation for the difference in allele frequencies?
(A) Mutation (B) Independent assortment (C) Reproductive isolation (D) Sex linkage
The presence of AB blood type illustrates the principle of
A) incomplete dominance. B) codominance. C) pleiotropy. D) polygenic inheritance.