The process by which cells become specialized during development is called _____
a. somatic cell nuclear transfer
b. differentiation
c. development
d. mitosis
e. meiosis
ANSWER: b
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Scientists perform ____ in order to ____ a
given ____.
a. experiments; test; hypothesis. b. tests; experiment; law. c. tests; experiment; variable. d. facts; test; variable. e. hypotheses; try; experiment.
Familial hypercholesterolemia is a genetic disease that affects approximately one in 500 people worldwide. There is more than one genetic cause of the disease. Class I is often described as an autosomal dominant disease. Affected individuals have cholesterol levels >250 as children and often >300 as adults. However, homozygotes have cholesterol levels of >600 as children and can die of heart attacks in their 20s. These individuals entirely lack a functional LDL receptor.
Which of the following would be the best description of the inheritance of this form of hypercholesterolemia? A) Dominant epistatic B) Codominant C) Incompletely dominant D) Complementary E) Recessive epistatic
Which of the following reactions is a hydrolysis reaction?
A. A + B ? C + H2O B. A ? B + C+ H2O C. A + H2O ? B + C D. A + B + H2O ? C
You are maintaining a small population of fruit flies in the laboratory by transferring the flies to a new culture bottle after each generation. After several generations, you notice that the viability of the flies has decreased greatly
Recognizing that small population size is likely to be linked to decreased viability, the best way to reverse this trend is to _____. A) cross your flies with flies from another lab B) reduce the number of flies that you transfer at each generation C) transfer only the largest flies D) change the temperature at which you rear the flies