Molecular biologists can determine experimentally whether a region of DNA contains closed chromatin or open chromatin by assessing the sensitivity of the region to __________
A) nucleosomes
B) histone deacetylase
C) RNA polymerase II
D) methyltransferase
E) DNAse
E
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Which of the following is a small Gram-negative rod requiring X-factor for growth?
A. Escherichia coli. B. Treponema pallidum. C. Neisseria gonorrheae. D. Haemophilus ducreyi
Menstruation begins in response to ____
a. rising levels of FSH and LH b. rising levels of GnRH c. rising levels of progesterone d. falling levels of progesterone e. rising levels of estrogen
Which of the following is false regarding nondisjunction?
A. Nondisjunction results in sex cells having too few or too many chromosomes. B. The frequency of nondisjunction increases in women over the age of 37. C. Nondisjunction is a cause of Down syndrome. D. A cell with one too few chromosomes is trisomic.
What animal cannot make hypertonic urine?
A. Grasshopper B. Blue jay C. Human D. Dog E. American toad