Hemophilia A is an X-linked recessive disorder. If a normal man marries a woman who is a carrier, what fraction of their daughters will have hemophilia? Select one:
a. 25%
b. 50%
c. 75%
d. 0%
e. 100%
d. 0%
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What are the nodes of Ranvier?
A. breaks in the myelination along an axon B. the population of voltage-gated sodium channels located at the axon hillock C. the point of communication between an axon terminal and a muscle cell D. branch points along an axon
The primary determinant of blood flow to a particular region of the body during normal physiological function is
A. the radius of arterioles. B. blood hematocrit. C. the length of arterioles. D. venous return regulated by sympathetic activation. E. leakage of fluids from the capillaries.
Which action that spreads pathogens is the simplest to prevent?
1.inhalation
2.indirect contact
3.contact with a vector
4.direct contact
Although carbon dioxide contains carbon, it is not considered an "organic" compound because ____.
A. it is not found in the earth's crust B. it is not present in living cells C. the carbon atom is not bonded to at least one hydrogen atom D. the carbons are not in chains or rings E. it is too small