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 a low sperm count due to decreased spermatogenesis.
C. He would have high levels of mutation within his mature sperm.
D. He would have difficulty getting and/or sustaining an erection.
D. He would have difficulty getting and/or sustaining an erection.
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Pyruvate passes freely across some intracellular membranes. The membranes of the ________ must be crossed by pyruvate prior to its oxidation during respiration.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a two-carbon hydrocarbon with a single-carbon carbon bond?
a. ethene b. ethyne c. ethane d. ethylene
In humans, the gene for blood type has ____________________ (number) alleles and the A and B alleles are
____________________. Fill in the blank(s) with the appropriate word(s).
All tapeworms are intestinal parasites that completely lack digestive systems
Indicate whether the statement is true or false