Which of the following base pairs would be targeted and repaired by a mismatch repair system?
A. C-G
B. A-T and C-G
C. A-G
D. A-T
E. A-G and C-G
Answer: C
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George is a normal XY boy. Who among the
following would essentially have the same Y chromosome as George?
a. his father’s brother b. his mother’s father c. his mother’s brother d. his father’s father e. more than one of these is possible but only those who are related to his father
Transmembrane movement of a substance down a concentration gradient with no involvement of membrane proteins is called ________
Fill in the blank with correct word.
Donating blood in the United States
A) requires that the donor be at least age 17. B) does not involve a physical examination. C) though beneficial, may take several hours to complete. D) depends on donors with no prior sexual history. E) is easy and painless, and many donors are allowed to give 5 to 10 units at a time.
Primary succession may be seen:a
on new lava or on sand dunes. b. after a fire. c. when farmland is abandoned. d. only in tropical rain forests. e. in any community that has periodic disturbances.