Which of the following statements is true?

a. The cell walls of bacteria are composed of peptidoglycan.
b. Peptidoglycan is a fatty acid.
c. Gram-positive bacterial walls have a relatively thin layer of
d. peptidoglycan anchored to the cytoplasmic membrane by teichoic acids.


Ans: a. The cell walls of bacteria are composed of peptidoglycan.

Biology & Microbiology

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Which of the following is an intermediate in the reaction that forms Ala-tRNA?

A. Alanyl-ATP B. Alanyl-ADP C. Alanyl-PPi D. Alanyl-AMP

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Place the events of parturition in the correct order.

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In chemistry, what is a base?

a. A base is any substance that increases the hydrogen ion (H+) concentration in a solution. b. A base provides either hydrogen ions (H+) or positively charged ions that combine with hydroxide ions (OH-). c. A base provides either hydroxide ions (OH-) or negatively charged ions that combine with hydrogen ions (H+). d. A base is any substance that increases the hydroxide ion (OH-) concentration in a solute.

Biology & Microbiology