Variolation involved using
A. antibodies to the smallpox virus.
B. a recombinant carrier with genetic material of the smallpox virus.
C. dried, ground smallpox scabs.
D. preparations of human cowpox lesions.
Answer: C
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In many ways, ________ as a biofuel compares very favorably to ethanol and other fuels.
Fill in the blank(s) with the appropriate word(s).
The term for a cross that involves just one trait, such as pod shape, is called a
a.) homozygous cross. B.) test cross. C.) monohybrid cross. D.) dihybrid cross.
One form of NGU is lymphogranuloma venereum caused by
A) Leptospira interrogans. B) Chlamydia trachomatis. C) Neisseria gonorrhoeae. D) Treponema pallidum. E) Candida albicans.
Darwin's concept of evolution "the theory of descent with modification through variation and natural selection" can be demonstrated by which of the following examples?
A. A monkey accidentally drops her fruit in the salty water of a bay, she recovers the fruit and eats it. She discovers that the fruit is cleaner and tastes better after it has been in the salty water. She continues to wash fruit in the bay before eating. Her offspring see what she has done and also wash their fruit in the salty water. Soon the whole population is washing their fruit. B. A female alligator gives birth to a male alligator that has the ability to change color to a bright white when it is in cold water. The baby male alligator is quickly spotted by a large bird of prey and eaten. C. Several turtles hatch from a clutch of eggs buried in the sand on a beach. One of the turtles is the color of the sand, the others are darker in color. The turtles all scurry to the water, but one by one the dark turtles are eaten by birds, only the sand colored turtle survives. When it enters the water the sand color changes to a darker brown. The turtle grows, mates and has offspring that are also sand colored when they are born. D. A giraffe stretches his neck to reach higher branches. The exercise of stretching up strengthens the muscles in the neck and legs. This ability to stretch is also seen in the giraffe's offspring.