Listeria monocytogenes causes a variety of diseases, including food poisoning. Listeria are small, gram +, motile rod-shaped bacteria. Which of the following best describes these microorganisms?

A. listeria are facultative intracellular pathogens
B. once infected, the immune system cannot destroy listeria
C. listeria cannot be cultivated on artificial media
D. flagella are produced both at room temperature and at 37C


Answer: A. listeria are facultative intracellular pathogens

Biology & Microbiology

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Echinoderms and chordates are

(a) deuterostomes. (b) protostomes. (c) animals whose blastopore becomes a mouth. (d) both b and c.

Biology & Microbiology

Which of the following statements about Caenorhabditis elegans is FALSE?

a. It is asexual. b. It is anatomically simple. c. It has a fixed cell number. d. Specimens do not have to be killed to be studied. e. It completes its life cycle in three days.

Biology & Microbiology

The example of agarose displayed is composed of two chains coiled around each other in a helical (spiral) fashion. Agarose molecules are generally composed of hundreds of sugar residues. Approximately how many residues are in each of the chains?

a. 2 b. 4 c. 6 d. 8

Biology & Microbiology

A nucleosome is a linear chromosome wound around the

A. nuclear membrane. B. nucleolus. C. mRNA. D. histone. E. rRNA.

Biology & Microbiology