Each amino acid differs from others in the
A) chemical structure of the R group.
B) size of the amino group.
C) number of carboxyl groups.
D) number of central carbon atoms.
E) number of peptide bonds in the molecule.
A) chemical structure of the R group.
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A drug company produces an anti-venom for snake bites and terms it "snake rescue gamma globulin." The anti-venom is probably made from which type of antibody?
A. IgA B. IgE C. IgM D. IgG E. Could be any of these
Which of the following statements regarding blood-type incompatibilities between a mother and her fetus is TRUE?
A. A fetus with type B blood may be at risk if its mother has type O blood. B. An Rh-positive fetus may be at risk if its mother is Rh-negative. C. An Rh-negative fetus may be at risk if its mother is Rh-positive. D. The greatest risk to a fetus occurs when both mother and fetus are Rh-positive. E. The risk to an Rh-positive fetus of an Rh-negative mother is lessened if she has previously carried an Rh-negative fetus.
Graded potentials in a nerve or muscle cell membrane:
1.spread by passive current flow.
2.are local changes in membrane potential.
3.spread from the point of origin
4.Both 1 and 2 are correct.
5.All of these are correct.
In the oral cavity, the opening of the parotid duct (parotid papilla) is located
A. on the palate just posterior to the maxillary incisors. B. in the buccal vestibule opposite the maxillary 2nd molar. C. just lateral to the lingual frenum. D. on the floor of the mouth along the sublingual fold. E. at the junction of the body and base of the tongue.