Recurrent episodes of rheumatic fever would MOST likely cause:
A) metastatic brain cancer.
B) frequent streptococcal infections.
C) progressive failure of the liver.
D) permanent damage to the heart valves.
Answer: D) permanent damage to the heart valves.
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Which of the following best describes the neuroendocrine-to-endocrine pathway of hormone action?
A) A neural organ that produces hormones regulates another gland through the release of hormones into the circulation that travel to the affected gland. B) A neural organ that produces hormones releases its hormones directly into another gland that it regulates. C) A gland releases hormones directly into a neural structure, thus regulating neural functions. D) A gland exhibits negative feedback on the nervous system by releasing hormones into neural tissue both directly and indirectly through the circulation .
The parts of the graph indicated at points C, D, and E represent
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A) depolarization.
B) hyperpolarization.
C) the refractory period.
D) repolarization.
E) sodium channel activity.
You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases. This indicates that the compound X is an __________.
A. non-competitive inhibitor B. competitive inhibitor C. activator D. allosteric inhibitor E. enzyme
Photosynthetic autotrophs use ________ from the air as a carbon source and ________ as their energy source
Fill in the blank(s) with correct word