From the data, scientists conclude that plants survived heat best
A. when infected by the virus.
B. with virus-free fungi.
C. when not infected by the virus.
D. with virus-infected fungi.
E. without fungi.
D. with virus-infected fungi.
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The direction of water movement across a cell membrane is determined in part by:
A. the presence of transporter molecules. B. the levels of ATP in the cell. C. the concentration of solutes inside and outside the cell. D. the pressure gradient existing between the inside and the outside the cell E. the concentration of solutes and the pressure gradient existing between the inside and the outside the cell.
As mature adults, male squid have a modified tentacle that carries their sperm. Sperm are
produced in testes and transferred to this modified appendage prior to mating. During courtship and mating, the male will insert this tentacle into a structure know as the mantle cavity of a female, where the eggs are waiting. Fertilization occurs within this body cavity. Which of the following is true about this scenario?
a. Internal fertilization occurs. b. External fertilization occurs. c. These animals have an amniotic egg. d. both (a) and (c)
Chemoreceptors for blood pH are located in the brain stem and the lungs.
Answer the following statement true (T) or false (F)
The X chromosome in humans is
a. found as a pair in females. b. the only human sex chromosome. c. present only in females. d. always found in single copy.