What legal restrictions on the use of PGD are in place in the United States?
A. It has been banned across the board.
B. It can only be used to prevent implantation if the disease diagnosed has a 100 percent
chance of occurring with the genotype revealed.
C. It cannot be used for sex selection.
D. It cannot be used for screening embryos to be tissue donors.
E. None of these are legal restrictions currently in place in the United States.
E
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During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____
A) break cross-bridges by acting as a cofactor in the hydrolysis of ATP B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed C) transmit action potentials from the motor neuron to the muscle fiber D) spread action potentials through the T tubules E) re-establish the polarization of the plasma membrane following an action potential
What happens when a resting neuron's membrane depolarizes?
A) There is a net diffusion of Na+ out of the cell. B) The equilibrium potential for K+ (EK) becomes more positive. C) The neuron's membrane voltage becomes more positive. D) The neuron is less likely to generate an action potential. E) The cell's inside is more negative than the outside.
Which of the following pigments is found exclusively in red algae?
A) chlorophyll a B) chlorophyll c C) lutein D) phycoerythrin E) ?-carotene
If reproduction occurs early in the life cycle,
what occurs?
a. Population growth rate increases. b. Population size declines. c. Population size is not affected. d. Generation time increases. e. Growth rate remains unchanged.