The viral envelope is derived from the host ________ during __________.

a. cell membrane; release
b. cell membrane; penetration
c. peptidoglycan structure, release
d. cellulose, penetration


Ans: a. cell membrane; release

Biology & Microbiology

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Tacrolimus (FK-506) is a drug that inhibits an enzyme called calcineurin. Calcineurin is a protein phosphatase. This is an enzyme that dephosphorylates (removes phosphate groups) from proteins. When added to cells, tacrolimus can inhibit the dephosphorylation of a protein called NFAT, but it cannot prevent the dephosphorylation of a protein called CDK1 . What is the most likely explanation for

this finding? A. Calcineurin requires an additional cofactor to dephosphorylate NFAT B. NFAT is a substrate of calcineurin, but CDK1 is not C. Tacrolimus is a competitive inhibitor of calcineurin for NFAT and CDK11 D. Tacrolimus changes the optimum pH for calcineurin

Biology & Microbiology

Where do plants typically store their starches and sugars for later use?

A. In the leaves B. In the roots C. In the stems D. In the flowers

Biology & Microbiology

In E. coli, the genetic material is composed of ________

A) circular, double-stranded RNA B) circular, double-stranded DNA C) polypeptide chains D) RNA and protein E) linear, double-stranded DNA

Biology & Microbiology

Chloroplasts contain a green photosynthetic pigment called

A. chlorophyll. B. chromatin. C. hemoglobin. D. keratin. E. Gram stain.

Biology & Microbiology