The hormone FSH stimulates the development of a follicle in the human female. As the follicle develops, it secretes estrogen. A high level of estrogen decreases the secretion of FSH. This mechanism is an example of
A. cell differentiation
B. in vitro fertilization
C. positive tropism
D. negative feedback
Answer: D. negative feedback
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Which of the following regions connects directly to the rectum?
a. sigmoid colon b. ascending colon c. descending colon d. transverse colon e. appendix
Which of the following statements about the skeleton of a clam is NOT true?
A. The skeleton of a clam has two separate shells. B. The skeleton of a clam has muscles attached to it from the inside of the body. C. The skeleton of a clam is made of calcium carbonate. D. The skeleton of a clam is used mainly to allow movement of the organism. E. The skeleton of a clam grows with the organism.
Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?
A) glycolysis and the oxidation of pyruvate to acetyl CoA B) oxidation of pyruvate to acetyl CoA and the citric acid cycle C) the citric acid cycle and oxidative phosphorylation D) oxidative phosphorylation and fermentation E) fermentation and glycolysis
How can you recognize a reliable source of information?
A. By checking whether the information was peer-reviewed B. By checking whether the source of information is primary C. By checking whether the authors are well qualified D. All of the above are ways to check whether a source is reliable