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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Microbially produced glycolipid surfactants are used for
A. emulsification and increasing detergency, which aids in biodegradability. B. prevention or reduction of microbial growth on surfaces, decreasing transmission of disease. C. solubilization of hydrophobic compounds, which enhances cleanup and recovery of oil from spills. D. both emulsification and increasing detergency and solubilization of hydrophobic compounds. E. both emulsification and increasing detergency and prevention or reduction of microbial growth on surfaces.
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.
Which of the following functional groups is mismatched to the organic compound in which it is typically found?
A. Hydroxyl - alcohols B. Amino - proteins C. Phosphate - carbohydrates D. Carboxyl - fatty acids E. Sulfhydryl - proteins
Cytosine, uracil, and thymine are single-ringed nitrogen-containing organic bases called ____________________. Fill in the blank(s) with the appropriate word(s)