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
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Echinoderms and chordates are
(a) deuterostomes. (b) protostomes. (c) animals whose blastopore becomes a mouth. (d) both b and c.
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.
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
A nucleosome is a linear chromosome wound around the
A. nuclear membrane. B. nucleolus. C. mRNA. D. histone. E. rRNA.