Individuals heterozygous for the RB+ and RB? alleles can develop tumors as a result of (Select all that apply.)
A) a mitotic crossover that leads to homozygosity for RB+ in some cells and RB? in other cells.
B) a somatic mutation in the RB+ allele that leads to homozygosity for RB?.
C) a somatic mutation in the RB? allele that leads to homozygosity for RB+.
D) the fact that RB? is dominant to RB+.
A) a mitotic crossover that leads to homozygosity for RB+ in some cells and RB? in other cells,
B) a somatic mutation in the RB+ allele that leads to homozygosity for RB?.
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Tony sometimes seems very "wound up." At those times, he seems full of energy, talks very rapidly, and makes very grandiose plans. (One time, he gave away all of his belongings and was planning to move to Washington, D.C., so he could advise the President.) At these times, he also seems to need almost no sleep. During other periods of time Tony seems very "down." During these times he does not take care of himself. He seems to want to sleep all the time, and he often makes thinly veiled references to wanting to commit suicide.
a. Schizophrenia b. Major Depression c. Dissociative Identity d. Bipolar Disorder e. none of the above
The oceans contain about ________% of the Earth's water.
A. 95 B. 93 C. 91 D. 97
A patient has very low plasma glucose levels, a condition called hypoglycemia. The problem is not associated with
insulin, but with the secretion of glucocorticoids. How would you evaluate the patient to determine where in the feedback system the problem is located?
What will be an ideal response?Which of the following injuries would be most
difficult for your body to repair?
a. broken leg b. a deep cut on your foot c. a twisted ankle d. a torn biceps muscle e. an ulcer