When the chromosome is most condensed, which
of the following is true?
a. Proteins are used to wind up the DNA.
b. They are less susceptible to radiation.
c. Lipid droplets form “beads on a string.”
d. Carbohydrates wind the DNA into clusters.
e. None of these are true.
Answer: a
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The birth process in mammals is an example of positive feedback
Indicate whether the statement is true or false.
The accompanying figure represents which chromosomal change?
a. inversion b. deletion c. duplication d. translocation e. aneuploidy
Which organ produces anti-diuretic hormone leading to water retention in the kidneys?
a. liver b. kidneys c. hypothalamus d. heart
Which of the following is an example of positive feedback?
A) After eating a meal containing high glucose levels, the pancreas secretes more insulin, a hormone that lowers blood glucose levels. B) After cutting your finger, the injured tissue releases chemicals that activate platelets in the blood. These activated platelets release chemicals to activate more platelets, leading to the formation of a blood clot. C) An elevation in blood pressure causes heart rate to decrease, thereby causing blood pressure to decrease. D) The secretion of the hormone TSH stimulates the thyroid gland to secrete thyroxine. Thyroxine, in turn, inhibits the secretion of TSH.