Which of the following may have cell walls containing teichoic acids?

A) Gram-negative bacteria only
B) Gram-positive bacteria only
C) archaea
D) both Gram-positive and Gram-negative bacteria
E) all prokaryotes


B

Biology & Microbiology

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A major chemical used to preserve meat products is ________.

A. refrigeration B. nitrite C. propionate D. ethylene oxide

Biology & Microbiology

Generally, movements are accomplished by:

a. a single muscle exerting a pulling force only. b. a single muscle exerting a pushing force only. c. groups of muscles opposing the actions of one another. d. groups of muscles collectively exerting pulling forces only. e. groups of muscles collectively exerting pushing forces only.

Biology & Microbiology

The word __________ actually refers to non-woody plants such as the grasses, and many annual flowers like petunias and marigolds. 

A. flower B. herb C. weed D. moss

Biology & Microbiology

From which molecules are mRNA molecules transcribed?

a. tRNA b. rRNA c. DNA d. proteins

Biology & Microbiology