A woman heterozygous for blood type A and a man with blood type AB are expecting a child. The probability of the child having type B blood is
A. 0.
B. 1/4.
C. 1/2.
D. 3/4.
B. 1/4.
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The radioactive decay of carbon-14 can be used to determine ____
a. relative dating b. absolute dating c. mutation rates d. plate tectonics e. extinction rates
The class Reptilia is a group of species that share a common ancestor and some, but not all of its descendants. It is
therefore considered ____.
a. monophyletic b. polyphyletic c. paraphyletic d. an outgroup e. a domain
Once glucose has entered a cell, what prevents it from diffusing back out of the cell?
a. Glucose pumps actively transported any leaked glucose back into the cell. b. One side of the cell membrane is permeable to glucose, but the other side is not. c. Glucose inhibitors attach to glucose once it’s in the cell. d. Glucose is phosphorylated, preventing it from leaving the cell. e. Glucose is hydrolyzed into two three-carbon molecules that cannot diffuse in a reverse direction.
Normal white blood cells (called B cells) and cancerous B cells that cause leukemia both carry a unique surface protein
called CD-19. a. True b. False