Which of the following enzymes is responsible for initiating the proofreading repair mechanism?

A. DNA ligase
B. DNA polymerase
C. AP endonuclease
D. DNA uracil glycosylase
E. None of the answer options is correct.


B

Biology & Microbiology

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A collection of similarly specialized cells and any extracellular material they secrete and maintain describes

(a) an organ. (b) a system. (c) a tissue. (d) organelles.

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Answer the following statements true (T) or false (F)

1. The Na+/K+-ATPase pump is a ligand-gated ion channel. 2. Ion gradients across the membrane drive numerous cellular functions. 3. The ability of bread to rise is mainly a function of the CO2 produced anaerobically during oxidative phosphorylation. 4. The aerobic breakdown of glucose yields 34 to 38 ATP, while the anaerobic breakdown of glucose yields 20 ATP.

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The eyes of many deep-sea fishes are tubular

Indicate whether the statement is true or false

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Smegma is produced by which gland?

A. Skene's B. Tyson's C. Bartholin D. Cowper's

Biology & Microbiology