Organotrophy: With (aerobic) & Without (anaerobic) O2
What will be an ideal response?
•Microbes can use other e- acceptors when oxygen is absent (animals can't!).
•Ex: Glucose = e- donor & Nitrite (NO2) = e- acceptor.
•= 440 - (-430) = 870 mV.
•Alternative e- acceptors = Lower (but still relatively high) energy yield.
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A patient was involved a serious accident and lost a large quantity of blood. In an attempt to replenish body fluids, distilled water—equal to the volume of blood lost—is added to the blood directly via one of his veins
A patient was involved a serious accident and lost a large quantity of blood. In an attempt to replenish body fluids, distilled waterâ€"equal to the volume of blood lostâ€"is added to the blood directly via one of his veins. What will be the most probable result of this transfusion? A) It will have no unfavorable effect as long as the water is free of viruses and bacteria. B) The patient's red blood cells will shrivel up because the blood has become hypotonic compared to the cells. C) The patient's red blood cells will swell and possibly burst because the blood has become hypotonic compared to the cells. D) The patient's red blood cells will shrivel up because the blood has become hypertonic compared to the cells. E) The patient's red blood cells will burst because the blood has become hypertonic compared to the cells.
Which of the following is not true of
cladistics? a. It involves making hypothesis about the evolutionary relationship between clades. b. It is a precise science. c. It can lead to a cladogram. d. It may involve parsimony analysis. e. It may use outgroups to ‘root’ the tree
Why is only one strand of DNA transcribed into mRNA?
a. Because mRNA is only required in small quantities. b. Because transcribing both DNA strands would produce different amino acid sequences. c. Because the other strand would produce the same amino acid sequence in reverse order. d. Because all genes are located on the same DNA strand, while the other strand acts as protection. e. Because the other strand is transcribed directly into amino acids.
A simple stain ________.
a. readily differentiates microbial groups b. allows observation of bacterial motility c. improves the contrast between the cell and the background, thus improving the visibility of bacterial cell shapes and structures d. requires two steps: a staining step, then the addition of a mordant to decolorize the specimen