In gel electrophoresis, DNA fragments are separated based on their:

A. sequence.
B. size.
C. charge.
D. how many adenine bases are in the
fragment.
E. how many thymine bases are in the
fragment.


B

Biology & Microbiology

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In a ribbon model of a polypeptide, broad arrows indicate:

A. -sheets. B. -helices. C. disulfide linkages. D. -sheets and -helices. E. All of these choices are correct.

Biology & Microbiology

Since many altruistic individuals do not reproduce, how are the genes for their behavior passed on? a. All altruistic individuals are born infertile; their sacrifices do not impair their reproductive potential

b. Altruists generally sacrifice themselves for close relatives, thus they share some genes with the individuals they help protect. c. Altruism always develops among highly inbred populations, where each individual is a near identical genetic copy of every other individual. d. Genetic evidence suggests that altruistic behavior results from mutant genes.

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Blood vessels that serve as gateways to capillary beds are ________

A) venules B) arteries C) arterioles D) veins

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__ is the abnormal blue color of the skin caused by deoxygenated hemoglobin

A. Erythema B. Cyanosis C. Jaundice D. Freckles E. Pallor

Biology & Microbiology