Why are flu vaccinations recommended for individuals on a yearly basis?
a. Live viral vaccines revert to disease-causing forms after a year if not replaced.
b. The body cannot create new flu antibodies, so they must be replaced yearly.
c. Mutations alter viral markers, rendering previous vaccination ineffective.
d. Yearly vaccinations allow scientists to track which vaccinations were effective.
c. Mutations alter viral markers, rendering previous vaccination ineffective.
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Which number identifies the site where activators bind?
a. 2 b. 3 c. 4 d. 5 e. 6
At the arteriole end of the capillary, precapillary sphincters
a. force blood back into arteries. b. control blood flow into capillaries. c. control blood flow into venules. d. connect arterioles to venules. e. force blood back into veins.
Third phase of mitosis; chromosomes are aligned at the metaphase plate.
What will be an ideal response?
Lysosomes are considered to be part of the endomembrane system because they _____
A) deposit end products of digestion in the endoplasmic reticulum B) facilitate movement between stacks of the Golgi C) are formed from products synthesized by the endoplasmic reticulum and processed by the Golgi D) are composed largely of phospholipids