Which of the following streptococcal diseases has a toxigenic type of pathogenesis?
A. Scarlet fever
B. Rheumatic fever
C. acute glomerulonephritis
D. impetigo
E. glanders
Ans: A. Scarlet fever
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During stationary phase, group members of Serratia produce prodigiosins that contain pyrrole
Considering its structural relatedness to other pyrrole-containing molecules of known function (e.g., chlorophylls, bacteriochlorophylls, porphyrins), propose a potential ecological role for these compounds in soil where they are involved in something other than photosynthesis. What will be an ideal response?
When analyzing a cross involving two traits, each trait is analyzed separately, and then the frequencies of each are combined to yield the observed phenotypic ratios
a. True b. False Indicate whether the statement is true or false
Which of the following is not a function of the eukaryotic glycocalyx?
A. Adherence B. Reception of chemical signals C. Movement D. Protection
Except for the stop codons, the codons in the genetic code specify which of ____ amino acids to use
a. 5 b. 64 c. 4 d. 20 e. 3