At the end of gastrulation, the ectoderm makes up the
A) lining of the embryonic digestive tract.
B) outer layer of the gastrula.
C) inner layer of the gastrula.
Answer: B
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Human birth rate peaked in the 1980s and has been slowly declining ever since. How is this expected to affect our population size over the next several decades?
A. The human population size will level off. B. The human population size will continue to increase at the same rate it has for the past 100 years. C. The human population size will begin to decline. D. The human population size will continue to increase, but not as fast as before.
Candida is another name for
a. baker’s yeast. b. brewer’s yeast. c. slime molds. d. yeast that can cause vaginal infections
The results of the treatment of 20 boys with SCID-X1 showed that ____
a. SCID-X1 can be cured through genetic engineering b. none of those treated were cured of the disease c. a bone marrow transplant can cure SCID-X1 d. our understanding of the human genome exceeds our ability to modify it e. the “treatment” caused numerous unforeseen complications.
In precipitation tests, maximum precipitation takes place when
A) the amount of the antibody exceeds the amount of the antigen. B) the amount of the antigen exceeds the amount of the antibody. C) the amount of the antibody and the amount of the antigen are at optimal proportions. D) a toxin is present. E) a complex solution of many antibodies is used.