Which of the following does not belong?

a. Polysaccharides
b. Nucleus acids
c. Lipids
d. Proteins


Ans: c. Lipids

Biology & Microbiology

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The event that occurs when allolactose levels increase in E. coli is

A. transcription of genes within the lac operon increases. B. transcription of genes within the lac operon decreases. C. transcription of genes within the lac operon does not change. D. E. coli cells replicate rapidly. E. the tryptophan operon becomes more active.

Biology & Microbiology

Which of the following is mismatched?

A) CO2 + 4H2 ? CH4 + 2H2O — Methane-producing bacteria B) 2 NO2- + O2? 2 NO3 — Nitrobacter C) 6CO2 + 6H2O ? C6H12O6 + 6O2 — Clostridium D) N2 + 6H+ ? 2NH3 — Beijerinckia E) SO42- + 10H+ ? H2S + 4H2O — Desulfovibrio

Biology & Microbiology

Which of the following is (are) used to define the field of microbiology?

A. The size of the organism studied B. The techniques in the study of organisms regardless of their size C. Both the size of the microorganism studied and the techniques employed in the study of organisms regardless of their size. D. Neither the size of the organism studied nor the techniques employed in the study of organisms regardless of their size.

Biology & Microbiology

What supplies the energy for muscle contraction?

A. actin B. Ca2+ C. myosin D. ATP E. tropomyosin

Biology & Microbiology