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.
Answer: C
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