Hemophilia is caused by an X-linked recessive mutation in humans. If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability that their first child will have hemophilia? (Assume that no other cases of hemophilia and no hidden carriers exist in the pedigree.)
A) 0
B) 1/4
C) 1/2
D) 1/8
E) 1
A) 0
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In transcription,
a. several proteins can made from the same DNA molecule. b. promoters are at the beginning of a gene. c. messenger RNA is produced. d. a specific enzyme called RNA polymerase is required. e. all of these are true.
Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?
A. Sympathetic activation has no effect on blood flow. B. Leakage of fluids from the capillaries has no effect on blood flow. C. Blood hematocrit has no effect on blood flow. D. Blood vessel length is relatively fixed and has no effect on blood flow.
The (reoviruses/retroviruses/rhinoviruses) have been studied more than any other group of viruses because of their unique features and the diseases they cause
What will be an ideal response?