Fertilization by multiple sperm is blocked by
a. the exocytosis of secretory vesiclesthat coat the egg.
b. a hardening of the plasma membrane.
c. a hyperpolarization of the plasma membrane.
d. the release of spermicidal jelly.
Ans: a. the exocytosis of secretory vesiclesthat coat the egg.
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How might a plant cell compensate for the excessive membrane fluidity that occurs during prolonged exposures to elevated temperature?
A. Reduce membrane cholesterol content. B. Alter the lipid composition to have longer phospholipid tails and fewer double bonds. C. Alter the lipid composition to have shorter phospholipid tails and more double bonds. D. Alter the lipid composition to have shorter and more unsaturated phospholipid tails. E. Reduce cholesterol content and alter the lipid composition to have shorter phospholipid tails.
The fungal diseases that are acquired the airborne route typically stay localized to the lungs, causing pneumonia.
Answer the following statement true (T) or false (F)
Hertz and Huey discovered which of the following compensatory mechanisms that allows lizards
living at high altitudes to survive lower mean air temperatures?
a. hibernation b. torpor c. increased time spent basking d. increased consumption of food e. shelter-seeking behavior
The maximum possible rate of increase is a species’
__________ potential. Fill in the blank(s) with the appropriate word(s).