Which of the following statements is (are) true concerning the vitelline layer of the sea urchin egg?
A) It is outside the fertilization membrane.
B) It releases calcium, which initiates the cortical reaction.
C) It has receptor molecules that are specific for binding acrosomal proteins.
D) A and B are true.
E) A, B, and C are true.
Answer: C) It has receptor molecules that are specific for binding acrosomal proteins.
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Which of the following is TRUE about exergonic reactions?
A. Exergonic reactions have a positive G. B. Exergonic reactions consume energy. C. Exergonic reactions are found only in biological systems. D. Exergonic reactions are catabolic. E. Exergonic reactions measure of the strength of an ionic bond.
The two strands of a DNA double helix are said to be antiparallel. This means that
a. the 5' end of one strand is directly paired with the 5' end of the other strand. b. since the double helix twists, it is not perfectly parallel. c. one strand has a negative charge and the other strand has a positive charge. d. the 5' end of one strand is directly paired with the 3' end of the other strand. e. both strands have a negative charge.
Suppose that some marine bacteria that are normally bioluminescent are NOT any more. As a result, what would the bacteria most likely be unable to do?
a. They would be unable to scare off potential predators. b. They would be unable to feed. c. They would be unable to communicate. d. They would be unable to reproduce.
What is the general position of the consensus sequence called the GC box? What is its sequence?
A) promoter; CAAT B) terminator; GGGCGG C) promoter; GGGCGG D) attenuator; GGGCGG E) terminator; CAAT