A layer of host cell membrane attached to a virus is called:
a. An envelope
b. A protein coat
c. A capsomere
d. A capsid
e. A plasmid
Answer: a. An envelope
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Which strategy can be used for regulation of metabolism?
A. Feedback inhibition B. Regulation of enzyme synthesis C. Allosteric regulation D. Covalent modification of enzymes E. All of the choices are correct.
The M phase of the cell cycle includes __________ and cytokinesis.
Fill in the blank(s) with the appropriate word(s).
(a) Describe by labeled diagram the structural components of the lac operon in E. coli
(b) State the function of the lac regulator gene. (c) State the function of ?-galactosidase in the lac system. (d) Show by diagram the manner in which lactose brings about transcription of the three structural genes of the lac operon. (e) Explain why certain mutations in the regulator gene (I-) of the lac system result in maximal synthesis of ?-galactosidase, permease, and transacetylase even in the absence of the inducer (lactose).
To form NADH from NAD+, two electrons and a proton are removed from an organic molecule. What term best describes the reaction in which electrons and a proton are removed from an organic molecule?
A. dehydrogenation B. decarboxylation C. isomerization D. condensation E. reduction