What process typically regulates the enzymes involved in metabolic reactions?
a. entropy capture
b. ATP blockage
c. feedback inhibition
d. substrate inhibition
Ans: c. feedback inhibition
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Energy is required in order to add a nucleotide to the growing strand of DNA during replication. From where does that energy come?
A. DNA polymerase B. DNA ligase C. helicase D. primase E. the incoming nucleotide
A scientist is searching for chemical compounds involved in embryonic limb development. He discovers a new compound that is transiently expressed in the limb, and only seems to affect cells in its immediate vicinity (up to a few cell lengths away)
How should the scientist classify this chemical compound? A. as an amine hormone B. as a peptide hormone C. as a steroid hormone D. as a paracrine factor E. as a neurotransmitter
Mangrove plants live in areas regularly flooded with salt water. Which of these is not a possible mechanism for controlling their salt balance?
A. The succulent leaves contain large quantities of water that dilute salt that is absorbed. B. Excess salt is stored in special tissues. C. The roots block salt uptake. D. Modified roots emerge above the water level and help oxygen diffuse into the roots. E. Absorbed salt is secreted from special salt glands.
The step involving ATP, hexokinase and the phosphorylation of glucose to glucose-6-phosphate is
A. an example of photophosphorylation. B. the final step of the Krebs cycle. C. an example of substrate-level phosphorylation. D. the first redox reaction of the electron transport system. E. an example of oxidative phosphorylation.