The salinity of seawater at the poles is:

a. high due to evaporation.
b. low due to precipitation.
c. high due to freezing.
d. low due to river input.
e. similar to the open ocean.


C

Biology & Microbiology

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Encouraging the growth (via nutrient fertilization) of photosynthetic protists in marine environments may help reduce global warming because _____

A) photosynthetic protists are primary consumers in many marine food chains B) photosynthetic protists fix atmospheric carbon dioxide, decreasing atmospheric carbon dioxide levels C) the increased oxygen consumption by large populations of photosynthetic protists will increase photosynthesis in land plants D) photosynthetic protists would release a lot of oxygen, and fertilizing them would increase levels of oxygen in the atmosphere

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An antigen must be at least ________ amino acids long to be effective in a vaccine

A) 10 B) 25 C) 50 D) 100

Biology & Microbiology

Living cells maintain biochemical reactions far from equilibrium conditions. They do this by

constantly manipulating the concentrations of reactants and products. Why is it important that a state far from equilibrium be maintained? What will be an ideal response?

Biology & Microbiology

Inflammation begins when mast cells in tissue release __________, which increases blood flow and also makes capillaries leaky to phagocytes and plasma proteins.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology