The purpose of sodium dodecyl sulfate (SDS) in a two-dimensional gel electrophoresis experiment is that it allows proteins to separated by
A. by charge only
B. primarily by molecular mass
C. by a combination of both size and mass
D. net charge
B
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Amal has a serious metabolic disorder known as PKU. His sister has the same disorder. Neither of
Amal’s parents have the disorder. What is the most likely inheritance pattern of this disorder? A. Autosomal dominant B. Autosomal recessive C. X-linked dominant D. X-linked recessive E. It is not possible to tell the inheritance pattern from this information.
Which of the following types of skin damage are the most superficial?
A) first-degree burns B) second-degree burns C) third-degree burns D) All of these have the same level of pain.
Which statement about the B cells' abilities to produce antibodies is most accurate?
A) There are no B cells until an antigen is encountered. B) Most B cells are capable of producing any kind of antibody. C) B cells wait to encounter an antigen and then copy it. D) There may be 100 million different B-cells, each producing a different antibody. E) B cells don't produce antibodies until they develop in the thymus.
Which of the following does not assist the kidneys in excretion of nitrogenous wastes?
A. pancreas B. blood C. sweat glands D. muscles E. liver