In the cAMP signal transduction pathway, once a protein kinase is activated, which of the following
happens next?
a. G protein is activated.
b. Adenylyl cyclase is activated.
c. GDP is replaced by GTP.
d. cAMP is converted to ATP.
e. The protein kinase activates a cellular response.
E
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In some rocky intertidal habitats, the barnacle Chthamalus can survive across the same depths as can the barnacle Balanus
However, where the two occur together, Chthamalus adults are found only in the more stressful upper portions of the habitat where they are more prone to desiccation. This is an example of: A. the mutualistic form of symbiosis. B. intraspecific competition reducing the size of Chthamalus' fundamental niche to a smaller realized niche. C. mutualism reducing the size of Balanus' realized niche to a smaller fundamental niche. D. competitive exclusion reducing the size of Chthamalus' fundamental niche to a smaller realized niche. E. competitive exclusion expanding the size of Balanus' realized niche to a larger fundamental niche.
The reaction: pyruvate + CoA + NAD+ ? acetyl CoA + CO2 + NADH, is catalyzed by pyruvate dehydrogenase. If an inhibitor of this enzyme was added to cells, then ___ levels in the cytoplasm would increase.
A. NADH B. Pyruvate C. Acetyl CoA D. CO2
Procollagen chains are synthesized on the endoplasmic reticulum.
a. true b. false
If a gene has three alleles in a population, their frequencies must add up to ________
A) 1.0 B) 0 C) 3.0 D) 1.5