Which of the following cofactors is very important in the synthesis of purines?

A. Acetyl-CoA
B. Glutathione
C. Cytidine diphosphate
D. Folic acid


Answer: D

Biology & Microbiology

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The depolarization phase of an action potential requires _____

A) opening of K+ channels in the membrane B) opening of Na+ channels in the membrane C) opening of Ca2+ channels in the membrane D) a K+ concentration gradient across the membrane E) a Ca2+ concentration gradient across the membrane

Biology & Microbiology

All of the following types of culture media are enriched and selective except:

A) blood agar. B) colistin-nalidixic acid agar. C) phenylethyl alcohol agar D) Thayer-Martin agar.

Biology & Microbiology

Explain how the term "fluid mosaic" describes the plasma membrane

What will be an ideal response?

Biology & Microbiology

Urine is moved through the ureter to the bladder by muscular contractions known as ____.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology