Enzymes
a. are usually carbohydrates.
b. can only catalyze a reaction once.
c. reduce the activation energy of chemical reactions.
d. eliminate the activation energy of chemical reactions.
Answer: c. reduce the activation energy of chemical reactions.
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The binding of a neurotransmitter to ligand-gated Cl? channels will cause ____ in the postsynaptic
membrane.
a. depolarization b. hyperpolarization c. repolarization d. apolarization e. depolarization and repolarization
After a meal, ectotherms often situate themselves in a warm and or sunny spot. This can be critical to the health of the animal. Why is this process important?
A. The digestive process is enzyme catalyzed. An increase of 10 degrees Celsius can increase the rate of enzyme-driven reactions 10 times the original rate. B. The digestive process is enzyme catalyzed and regulated within the body. This behavior has nothing to do with digestion. C. The digestive process is enzyme catalyzed. An increase of 10 degrees Celsius can decrease the rate of enzyme-driven reactions, which provides more time for greater nutrient absorption. D. The digestive process is enzyme catalyzed. An increase of 10 degrees Celsius can increase the rate of enzyme-driven reactions 2-3 times the original rate.
Which one of the following statements is TRUE regarding the nitrogen cycle?
A) Nitrogen fixation results in the production of nitrogen from carbon. B) Atmospheric nitrogen is unavailable to living organisms because two nitrogen atoms are held tightly together by a triple covalent bond. C) Plants take up ammonia directly from the atmosphere. D) Once nitrogen is "fixed," it must then be converted to nitrogen gas before living organisms can use it. E) In a balanced ecosystem, nitrogen fixation occurs more often than denitrification.
Why is chlamydia much more common than syphilis?
A. Many chlamydia infections are asymptomatic. B. Syphilis can penetrate a condom whereas chlamydia cannot. C. Chlamydia is viral, and viral diseases spread much quicker. D. Chlamydia is spread via droplet inhalation. E. Chlamydia is resistant to most antibiotics.