The initial classification of a bacterial isolate is dependent upon multiple factors. Which of the following factors is not used in the initial classification of an isolate?
A) Shape of cells
B) Arrangement of cells
C) Staining characteristics
D) Rate of growth/division of cells
D) Rate of growth/division of cells
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Relative to enzymes in mesophilic microorganisms, which of the following is NOT characteristic of enzymes in psychrophiles?
A) decreased alpha helices B) decreased beta sheets C) less hydrogen bonds D) less ionic bonds
Multiple alleles are common because
A) RNA is an informational molecule, and many sequences are possible for a particular gene. B) proteins are informational molecules, and many amino acid sequences are possible. C) a gene sequence can vary in different ways and still encode a functional protein. D) there are many humans on the planet.
A 100 ml sample of water is filtered through a sterile membrane, and the membrane is transferred to a plate of m-Endo agar. Following overnight incubation at 37°C, 57 green metallic colonies appear. The coliform count is
A. acceptable for drinking water and recreational use. B. too high for both drinking water and recreational use. C. acceptable for recreational use but too high for drinking water.
A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass. They inject a 5 M solution of glucose into the cell and then place the cell into a beaker containing 10 M glucose. What effect do you expect to observe?
A. water moves out of the cell B. glucose moves into the cell C. glucose moves out of the cell D. water moves into the cell E. no net change in cell weight