Inhibin is a hormone that
A. is involved in a negative feedback relationship with the anterior pituitary and hypothalamus to regulate testosterone levels.
B. prevents or inhibits erection.
C. is involved in a positive feedback relationship with the hypothalamus to regulate maturation of eggs in the oviduct.
D. is involved in a negative feedback relationship with the anterior pituitary and hypothalamus to trigger ovulation in females.
E. prevents or inhibits sexual urges.
Answer: A
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Frameshift mutations (select all that apply)
A. cause the insertion or deletion of a single amino acid from the polypeptide chain. B. result in premature stop codons. C. change the entire amino acid sequence downstream from the site of the insertion or deletion. D. are known risk factors in most forms of cancer, including breast and colon cancer. E. are known risk factors in breast cancer, but not colon cancer.
Lamarck argued that long-legged wading birdsare descended from short-legged ancestors that stretched their legs to
stay dry while feeding in shallow water, and consequently produced offspring with slightly longer legs. Which mechanism did he use to support this argument?
a. principle of use and disuse b. theory of catastrophism c. inheritance of acquired characteristics d. natural selection e. evolution of vestigial structures
A particle in the atom that has neither a negative nor a positive electrical charge is the
A. electron. B. element. C. isotope. D. neutron.
Which of the following is a protective structure where egg cells are formed in bryophytes and some other plants?
a. stoma b. strobilus c. sporangium d. archegonium