Red blood cells are produced in the _______.
a) thymus gland
b) liver
c) pancreas
d) red bone marrow
e) kidneys
Ans: d) red bone marrow
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The condition shown in the photograph, xeroderma pigmentosum, is caused by dimerization of thymine bases when UV damage to DNA is not repaired. What mechanism exists to repair this kind of damage to DNA?
a. proofreading
b. nucleotide mismatch repair
c. nucleotide excision repair
d. phosphodiester substitution
What would be the karyotypic designation of a female with trisomy for the X chromosome?
____________________ Fill in the blank(s) with the appropriate word(s).
Which of the following statements correctly describes the behavior of a tetrad during anaphase I of meiosis?
A) It travels intact to one pole of the dividing cell. B) It splits into two pairs of sister chromatids, and one pair goes to each pole of the dividing cell. C) It splits into two pairs of homologous, nonsister chromatids, and one pair goes to each pole of the dividing cell. D) It splits into four chromosomes, which distribute in random pairs to the two poles of the dividing cell.
The uniformity in the way nerve cells function within the animal kingdom
A) indicates that the peripheral nervous system (PNS) evolved before the central nervous system (CNS). B) is evidence that the neuron was an early evolutionary adaptation. C) is proof of neurotransmitter efficiency. D) must have prevented the development of diversity.