What is the purpose of getting a "flu shot" every year?
A. It lets your body get used to having the flu
so that you won't feel as sick when you
actually do get the flu.
B. It exposes your immune system to
antigens present on the flu virus, and
antibodies can be made by the immune
system
C. It exposes your immune system to
antibodies present on the flu virus, and
antigens can be made by the immune system
D. It exposes your immune system to the
virus and causes gene recombination in
memory B-cells.
B
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The two identifying characteristics of addiction are
A) intolerance and independence. B) intolerance and dependence. C) tolerance and independence. D) tolerance and dependence.
Marsh periwinkles are able to survive out of the water because their ________ can absorb oxygen from the air
a. muscular foot b. mantle cavity c. radula d. operculum
The first plants were _____
a. ferns c. bryophytes b. flowering plants d. conifers
In photosynthesis, an H+ ion gradient forms across the ________
A) thylakoid membrane B) outer chloroplast membrane C) endomembrane D) inner chloroplast membrane