In which type of vessel do the walls contain a high proportion of smooth muscle?

a. lymphatic vessels
b. arterioles
c. capillaries
d. venules
e. veins


ANSWER: b

Biology & Microbiology

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Which one of the following is directly involved in the process of blood clotting?

A) sodium ions B) antigen C) fibrin D) clotting factor XX E) globulins

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Why is DNA replication considered semiconservative?

A) DNA is created from only four of nine available nucleotides. B) The DNA molecule includes a parental strand and newly created DNA strand. C) DNA is not just one strand but two complementary strands. D) DNA is divided into a top half and a bottom half before replicating.

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Identify the viral disease from the list below:

A) botulism B) influenza C) anthrax D) ringworm

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A trait in which the heterozygotes have a phenotype that is intermediate between the dominant and recessive phenotypes is an indication of

a. codominance. b. pleiotropy. c. a sex-linked trait. d. incomplete dominance. e. None of these are correct.

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