Irrigated land accounts for approximately what percentage of human food production?
a. 10
b. 30
c. 50
d. 75
e. 90
B
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The activation of receptor tyrosine kinases is characterized by _____
A) dimerization and phosphorylation B) dimerization and IP3 binding C) a phosphorylation cascade D) GTP hydrolysis E) channel protein shape change
Death from botulism is usually due to respiratory paralysis
Indicate whether this statement is TRUE or FALSE.
A fourth type of restriction enzyme is identified that cleaves at precise locations like a type II enzyme, but it also occasionally makes mistakes and cuts elsewhere. Would this type of enzyme be a useful enzyme to use in molecular cloning?
A. Yes, because it cuts correctly sometimes. B. No, because cutting mistakes could lead to incorrect cloning. C. No, because it is a precise enzyme. D. Yes, because cutting mistakes don't matter in molecular cloning.
Why do nitrogen-fixation nodules contain large amounts of leghemoglobin?
A. It helps transport oxygen to the bacteria. B. The nitrogenase enzyme interacts with the iron in the leghemoglobin. C. It stimulates the Nod factors. D. It prevents carbon dioxide from inhibiting the nitrogenase enzyme. E. The leghemoglobin helps break the triple bond of N2.