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
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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
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
Chloroplasts contain a green photosynthetic pigment called
A. chlorophyll. B. chromatin. C. hemoglobin. D. keratin. E. Gram stain.
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