A gene typically has many alleles because
A) a protein sequence can vary in many ways.
B) humans have many traits.
C) a chromosome has many genes.
D) a DNA sequence can vary in many ways.
D
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Arterioles have no significant parasympathetic innervation, with the exception of the abundant parasympathetic vasodilator supply to the arterioles of the genitalia
a. True b. False Indicate whether the statement is true or false
The structures in the nucleus that serve as a "mitotic clock" are
A. hormones.
B. ribosomes.
C. telomeres.
D. kinases.
Blood is a type of connective tissue.
Answer the following statement true (T) or false (F)
The adaptive significance of the crossed extensor reflex when a person steps on a tack is to
A. remove the foot from the tack. B. increase the rate at which withdrawal of the limb occurs. C. slow the rate of removal of the foot from the tack. D. reduce the pain sensations. E. prevent the person from falling down.