Which of the following statements about methyl-directed mismatch repair systems is FALSE?
A. Methyl-directed mismatch repair systems require the concerted actions of several proteins.
B. Methyl-directed mismatch repair systems require exonucleases.
C. Methyl-directed mismatch repair systems are most often used to correct pyrimidine dimers.
D. Methyl-directed mismatch repair systems exist in all species.
E. Methyl-directed mismatch repair systems require incorrectly matched base pairs in the DNA.
C. Methyl-directed mismatch repair systems are most often used to correct pyrimidine dimers.
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The digestive system of most animals is lined with cells through which nutrients are absorbed. What is the embryonic origin of these cells?
A) endoderm B) ectoderm C) mesoderm
Hibernation and estivation during seasons of environmental stress are both examples of _____
A) acclimatization B) torpor C) evaporative cooling D) nonshivering thermogenesis E) shivering thermogenesis
The number of linkage groups in an organism with sex chromosomes equals:
A. 1n B. 2n +1 C. 1n + 1 D. 2n + 2
Which method often results in colonies developing down throughout the agar along with some colonies on the surface?
A. Streak plate B. Spread plate C. Replica plate D. Pour plate