An artery has a much thicker muscle layer than

a. a vein
b. a capillary
c. a venule
d. all of the above


Answer: d. all of the above

Biology & Microbiology

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Which of the following lists contain

ingredients that are essential for PCR?

a. nucleotides, DNA template, Taq polymerase, and primers b. nucleotides, DNA template, DNA ligase, and primers c. restriction enzymes, DNA template, Taq polymerase, and primers d. nucleotides, DNA template, Taq polymerase, and plasmids e. nucleotides, DNA template, DNA ligase, and plasmids

Biology & Microbiology

Which of the following lack vascular tissue?

A) cone-bearing plants B) grasses C) ferns D) mosses

Biology & Microbiology

What is the smallest number of nucleotides that must be added or subtracted to change the triplet grouping of the genetic message?

A) one B) two C) three D) four

Biology & Microbiology

A substance that may trigger an immune response, if presented in the right context is termed a(n)

A) cytokine. B) antigen. C) effector. D) antibody. E) hapten.

Biology & Microbiology