Describe the general process of excision repair
What will be an ideal response?
Ans: Excision repair works on damage in which one strand of DNA is affected. In the incision step, an endonuclease recognizes the damage and nicks the DNA on both sides of the damage. Next, in the excision step, an exonuclease removes the strand between the nicks. Then, a polymerase synthesizes a replacement strand, and finally DNA ligase joins the new DNA to the remainder of the original strand.
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Which of the following is one reason that flatworms are flat?
a. They lack circulatory systems. b. They have small respiratory systems. c. They have only one germ layer. d. They lack any sex organs.
Leaves falling on the ground initially become a part
of soil horizon __________, but will later be a component of soil horizon __________. a. A; B b. A; O c. O; A d. B; A e. B; C
Which of the following best explains why a particular atom may not form compounds easily?
A) The atom has an uneven number of protons. B) The atom's outer energy shells are completely full. C) The atom has seven electrons in its outer shell. D) The atom has no electrons.
The three main forms of nitrogenous wastes found in animals are
A. ammonia, urea, and uric acid. B. uracil, urea, and uric acid. C. amino acids, uracil, and uric acid. D. ammonia, urea, and amino acids. E. ammonia, urea, and uracil.