Which of the following statements about DNA
replication is correct?
a. DNA replication is error free
b. DNA replication occurs without the help of
enzymes
c. In DNA replication, the parent strands are
discarded
d. Each newly formed DNA molecule
contains two new strands and two old
strands.
e. Each newly formed DNA molecule
contains one parent strand and three new
strands.
D
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All of the following are true of acute necrotizing ulcerative gingivitis (ANUG) except that it
A. is associated with severe pain, bleeding, pseudomembranes, and necrosis. B. is highly contagious. C. is common in AIDS patients. D. involves Treponema vincentii, Prevotella intermedia, and Fusobacterium. E. is due to poor oral hygiene, altered host defenses, or prior gum disease.
Crossing over
a. generally results in binary fission. b. involves centrioles. c. involves breakages and exchanges between sister chromatids. d. results in new combinations of alleles being channeled into the daughter cells. e. does all of these.
Huntington Disease is inherited in humans as an autosomal dominant gene. Affected individuals show progressive brain deterioration from cell death in the cerebral cortex. Onset of the disease usually occurs between ages 30 and 50
Give two possible reasons for the observed variation in the age of onset of this disease.
Which body system develops first in a human embryo?
A. nervous B. excretory C. reproductive D. respiratory E. circulatory