A defect in the HoxA-3 would most likely result in:
A. defects of the lungs.
B. defects of the thyroid.
C. defects of the limbs.
D. abnormal positioning of the kidneys.
E. an enlarged heart.
Answer: B
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YAC stands for yeast artificial cosmid
Indicate whether the statement is true or false
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.
Mosses are limited to moist environments because they
A. have large roots. B. have sperm that swim. C. do not have leaves. D. produce eggs.
________ observations are supported by factual information, while ________ observations involve personal judgment.
A. Objective; analytical B. Subjective; theoretical C. Subjective; analytical D. Objective; hypothetical E. Objective; subjective