The human finger contains ____ joints
a. hinge
b. fulcrum
c. ball-and-socket
d. lever
e. ligament
ANSWER: a
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The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell
trait is an example of _______________. A. natural selection D. heterozygote disadvantage B. genetic drift E. more than one of these C. spontaneous mutational spread
Which of the following explains how genetic variation in a population of bacteria results from this process?
(A) Bacterial proteins transferred from the donor bacterium by the phage to the recipient bacterium recombine with genes on the recipient's chromosome. (B) The recipient bacterium incorporates the transduced genetic material coding for phage proteins into its chromosome and synthesizes the corresponding proteins. (C) The phage infection of the recipient bacterium and the introduction of DNA carried by the phage cause increased random point mutations of the bacterial chromosome. (D) DNA of the recipient bacterial chromosome undergoes recombination with DNA introduced by the phage from the donor bacterium, leading to a change in the recipient's genotype.
Which of the following statements regarding skeletal muscle is true?
A) Skeletal muscle is attached to bones by tendons. B) Skeletal muscle cells are not striated. C) Skeletal muscle is largely responsible for involuntary body motions. D) Skeletal muscle coordinates movement of nutrients and oxygen throughout the body.
Which of the following types of fat are the least healthy?
A) trans fat B) monounsaturated fat C) saturated fat D) polyunsaturated fat