The exact elevation at which the treeline occurs depends on the __________ and __________
a. temperature; distance from the sun
b. altitude; distance from the sun
c. elevation; annual precipitation
d. latitude; distance from the ocean
e. longitude; distance from the equator
D
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Why do Rh-negative but not Rh-positive mothers sometimes have babies with hemolytic disease of the newborn?
A. This disease results when an Rh-negative mother's immune system is primed multiple times to produce anti-Rh IgG antibodies that can cross the placenta. If the mother is Rh-positive, she won't produce any anti-Rh antibodies at all. B. Rh-positive mothers produce IgM antibody, not IgG. This antibody can't cross the placenta, so it can't cause hemolytic disease of the newborn. C. Rh-positive mothers will receive a preventative shot from their physician prior to conception. This will provide the protection the fetus needs AFTER conception to avoid the disease. D. Rh-negativity is also associated with hyperproduction of antibodies. As such, Rh-negative mothers are more likely than Rh-positive mothers to produce the antibodies needed to produce this disease.
Which of the following statements about Caenorhabditis elegans is FALSE?
a. It is asexual. b. It is anatomically simple. c. It has a fixed cell number. d. Specimens do not have to be killed to be studied. e. It completes its life cycle in three days.
Inheritance of autosomal dominant disorders require to pass on the allele, while inheritance of autosomal recessive disorders require to pass on the allele for it to be expressed in the offspring.
A. either the mother or the father; both the mother and the father B. only the mother's X chromosome; only the father's Y chromosome C. the parent who has the disorder; the parent who is a carrier for the disorder D. only the father; only the mother E. All of the answer choices are correct.
A food chain is a series of organisms that
A. shares the same energy source. B. successively eats one another. C. shares the same niche. D. exhibits mutualism with each other. E. succeeds one another as a climax community develops.