Catabolic pathways that break down complex substances into more usable units are usually regulated in response to the
A) end products of the pathway.
B) levels of the molecule that is to be broken down.
C) other metabolites that are limiting.
D) levels of enzymes in the pathway.
B) levels of the molecule that is to be broken down.
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Which of the following is NOT a characteristic that distinguishes mammals from all other vertebrates?
A. mammary glands B. hair C. endothermy D. specialized teeth E. enlarged skull
Which of the following elements is considered an essential micronutrient for plants?
a. zinc b. potassium c. hydrogen d. arsenic e. platinum
Which of the following best describes adaptation?
a. When an individual changes its genotype to better suit its environment b. When an organism has heritable traits that “match” its environment c. When an individual changes its phenotype to better suit its environment d. When an organism purposefully mutates to fit its environment
During the winter of 1999, minimum temperatures did not get much below freezing in an Oregon pond, and the following summer, large mosquito populations were observed. In the winter of 2000, frost came early and most ponds were frozen for 3 months
The following summer, very small mosquito populations were observed. This is an example of A) density-dependent regulation. B) density-independent regulation. C) ecosystem carrying capacity. D) community carrying capacity. E) exotic regulation.