The reason why some individuals who inherit polydactyly (having an extra digit on the hand or feet) do not express the trait is due to
A. incomplete penetrance.
B. gene linkage.
C. pleiotropy.
D. incomplete dominance.
E. None of the answers are correct.
Answer: A
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What is the primary difference between NAD+ and NADP+ (shown in the figure above)?
a. NAD+ functions as an electron transporter, whereas NADP+ does not. b. NAD+ functions as an electron transporter in chloroplasts while NADP+ functions as an electron transporter in mitochondria. c. Both function as electron carriers, but NADP+ has a third phosphate group and NAD+ does not. d. Both transport electrons to the electron transport chain (ETC) found on the inner mitochondrial membrane, but NADP+ transfers its electrons to the ETC at a higher energy level. e. NAD+ functions as a free energy source for cells while NADP+ does not.
Nitrogen makes up about _________% of the Earth’s
atmosphere. a. 20 b. 40 c. 60 d. 80 e. 90
Neuroglial cells do all of the following EXCEPT
a. metabolically support other neurons. b. form sheaths around neurons and control the rate of impulse transmission. c. form more than half of the volume of the brain. d. provide physical support. e. conduct action potentials.
In humans, egg production (oogenesis) differs from sperm production (spermatogenesis) in that spermatogenesis
A. produces many more cells than oogenesis. B. occurs on a monthly cycle. C. produces polar bodies. D. occurs for a short period of a person's life.