Which of the following is the major source of the pathogens that cause nosocomial infections?
A) Escherichia coli
B) Enterococcus spp.
C) Staphylococcus aureus
D) Streptococcus pyogenes
D) Streptococcus pyogenes
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T cells and B cells are produced in the
A. bone marrow. B. thymus. C. Peyer's patches. D. nervous tissue.
Bacilli are ________ prokaryotes
A) spherical B) comma-shaped C) rod-shaped D) spiral
Fungi differ from bacteria in that fungi
a. Have cell walls. b. Have DNA. c. Have a nucleus. d. Spoil food. e. Are cellular.
Use your knowledge of amino acid characteristics to order the peptides below according to the net charge contributed by their side chains at physiological pH (~pH 7). Each peptide contains eight amino acids
Use the single-letter amino acid designations to generate your list, placing the most negatively charged peptide on the left and the most positively charged peptide on the right. In addition, for each peptide, list the total number of positive and negative charges. Remember that, at neutral pH, the amino terminus carries a positive charge and the carboxyl terminus carries a negative charge. A. YGAKKRA B. ARRKSTRK C. DERKQNST D. DDAEIYSA E. NQSTYEEG