Which of the following statements is true?
a. A colorblind girl's father must be colorblind.
b. A sex-linked allele cannot be dominant.
c. Females cannot have hemophilia.
d. A colorblind boy's father must be colorblind.
Answer: d. A colorblind boy's father must be colorblind.
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The diagram below depicts three phylogenetic trees. Which of the two show the same sister group relationships among groups A, B, and C?
A. 1 and 2 are equivalent. B. 2 and 3 are equivalent. C. 1 and 3 are equivalent. D. All 3 are equivalent. E. All 3 are differentâ€"no two are equivalent.
"Mad cow" disease, also called bovine spongiform encephalopathy, is caused by a ________
a. virus b. fungus c. bacteria d. prion
Hundreds of thousands of vitamin A deficiencies, and its resulting blindness, may be avoided with the
use of genetically modified ____________________. Fill in the blank(s) with the appropriate word(s).
What initiates the sodium-potassium pump?
A. Two potassium ions are transported into the cell. B. ATP binds to the protein which becomes phosphorylated (ADP is released). C. Three sodium ions are translocated out of the cell. D. Three sodium ions bind to the cytoplasmic side of the protein. E. Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind.