Lack of iodine will lead to the development of
a. diabetes insipidus.
b. diabetes mellitus.
c. a simple goiter.
d. acromegaly.
e. Graves disease.
C
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In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have high levels of mutation within his mature sperm. C. He would have difficulty getting and/or sustaining an erection. D. He would have a low sperm count due to decreased spermatogenesis.
Phylum Chordata includes two clades of invertebrates. Which of the following is an example of a chordate invertebrate?
a. sea slugs b. brittle stars c. lancelets d. moray eels
The third line of defense against foreign invaders is ____
a. adaptive immunity b. innate immunity c. secretions d. physical and chemical barriers e. inflammation
Which of the following substances is not considered part of blood plasma?
A. dissolved O2 B. red blood cells C. albumin D. urea E. glucose