A layer of membrane attached to a virus is called

an envelope.
a protein coat.
a chromosome.
a plasmid.
a nucleus


an envelope.

Biology & Microbiology

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Epinephrine

A. is an antihistamine. B. causes desensitization. C. inhibits the activity of lymphocytes. D. reverses constriction of airways.

Biology & Microbiology

An organelle found in plant cells and some members of the kingdom Protista but not in animal cells is a

A. chloroplast. B. lysosome. C. Golgi apparatus. D. rough endoplasmic reticulum. E. mitochondrion.

Biology & Microbiology

Bacitracin ________.

A. inhibits peptidoglycan synthesis B. interferes with protein synthesis C. interferes with plasma membrane function D. inhibits DNA replication

Biology & Microbiology

Allosteric enzyme regulation is usually associated with _____

A) feedback inhibition B) activating activity C) an enzyme with more than one subunit D) the need for cofactors

Biology & Microbiology