An embryo is protected from most mechanical impacts because of the ____
a. amniotic cavity
b. allantois
c. placenta
d. yolk sac
e. chorion
a
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The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H36O18 B) C18H32O16 C) C6H10O5 D) C18H30O15 E) C3H6O3
The leaf area index (LAI) of a temperate deciduous forest is highest during
A) fall. B) spring. C) summer. D) winter.
Proteins that are destined to become associated with the inner surface of the plasma membrane are:a
manufactured in the same way as protein hormones. b. manufactured in the same way as proteins destined to become external peripheral proteins. c. made on free ribosomes in the cytoplasm. d. made on ribosomes located on the rough endoplasmic reticulum. e. transported to the plasma membrane within a secretory vesicle
How does HIV know which cells to infect?
A. It can infect cells with particular surface receptors. B. It can infect any cell it comes in contact with. C. It can only infect cells that are actively growing and dividing. D. It only infects cells that line the reproductive tract. E. It can only infect cells on surfaces of the body where the temperature is lower.