Which of the following statements is false?
a. Enzymes catalyze reversible reactions in
either direction.
b. Enzymes are highly specific.
c. Most enzymes are carbohydrate molecules.
d. Enzymes do not allow some reactions to
occur that would never occur without them.
e. Enzymes may be temporarily modified
during their involvement with the substrate
C
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What type of environment is well suited for asexual reproduction?
a. terrestrial environment b. aquatic environment c. stable or predictable environment d. unstable or unpredictable environment
A mating system in which at least some females mate with more than one male is termed ________
A) vivapary B) polygyny C) polygamy D) polyandry
Which of the following demonstrates negative feedback by the endocrine system?
(A) During labor, the fetus exerts pressure on the uterine wall, inducing the production of oxytocin, which stimulates uterine wall contraction. The contractions cause the fetus to further push on the wall, increasing the production of oxytocin. (B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels. (C) At high elevation, atmospheric oxygen is more scarce. In response to signals that oxygen is low, the brain decreases an individual's rate of respiration to compensate for the difference. (D) A transcription factor binds to the regulatory region of a gene, blocking the binding of another transcription factor required for expression.
The cascade of events determining whether bacteriophage lambda elects to purpose lysogeny or a lytic cycle begins with a race between the production of the lambda repressor and ________.
A. endolysin B. integrase C. N protein D. Cro protein