People with Turner syndrome have ________ chromosome constitution.
A) XX
B) XXY
C) XO
D) XXX
C) XO
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Which of the following choices best describes gated transporters? a. Gated transporters are channels or pores in the membrane that are always open
b. Gated transporters expend energy to move molecules against concentration gradients. c. Gated transporters change shape in response to binding or charge, releasing the molecule on the other side. d. Gated transporters move two substances across the membrane in opposite directions.
Teosinte is a wild grass in Mexico from which corn (maize) was originally domesticated. How might corn that is grown commercially compare to teosinte?
A) Corn is less genetically diverse than teosinte. B) Corn is more genetically diverse than teosinte. C) Corn is a threat to teosinte populations. D) Corn is about as genetically diverse as teosinte.
HIV does the greatest damage to
A) the adrenal glands. B) pancreatic cells. C) nervous tissue. D) white blood cells.
The figure above demonstrates the relationship between:
a. small population size and genetic drift. b. population size and the effect of selection. c. population size and the effect of mutation. d. population size and effective population size. e. population size and the effect of migration.