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
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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
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.
Identify the viral disease from the list below:
A) botulism B) influenza C) anthrax D) ringworm
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.