In this diagram of the heart, which of the
following choices correctly identifies A and B?
a. A is the AV node; B is the cardiac
pacemaker.
b. A is the SA node; B is the septum.
c. A is the AV node; B is the SA node.
d. A is the SA node; B is the AV node.
e. A is the septum; B is the cardiac
pacemaker.
D
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A. Hydroxyl - alcohols B. Amino - proteins C. Phosphate - carbohydrates D. Carboxyl - fatty acids E. Sulfhydryl - proteins
The placenta
A) is where blood cells form before the fetus has bone marrow. B) nourishes the fetus and secretes hormones that maintain the pregnancy. C) is a membrane surrounding the embryo that gives rise to the blood vessels in the umbilical cord. D) is the membrane that contains the fetus.
Cytosine, uracil, and thymine are single-ringed nitrogen-containing organic bases called ____________________. Fill in the blank(s) with the appropriate word(s)
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