Lipids with unsaturated fatty acids
a. decrease the fluidity of membranes.
b. increase the charge associated with the inner face of a membrane.
c. increase the fluidity of membranes.
d. are present only on the inner side of the plasma membrane.
Ans: c. increase the fluidity of membranes.
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Which of the following best describes the process of ventilation?
A) the movement of oxygen gas through the blood of the circulatory system B) the movement of carbon dioxide gas through the blood of the circulatory system C) the movement of the respiratory medium past the respiratory surface D) the diffusion of gases into and out of the circulatory system E) the diffusion of gases into and out of tissues where cellular respiration occurs
The backbone of the DNA and RNA, polynucleotides consist of a repeating pattern of sugars, phosphate, sugar, phosphate
a. true b. false
Place the following steps in the correct order to reflect how a plaque assay is done.1. Several dilutions of sample to be assayed are prepared.2. Dilutions are mixed with the appropriate bacterial host.3. Bacterial/sample dilution mixtures are plated on agar plates.4. Plates are incubated to allow for plaque development.5. Plates from different dilutions are examined and plaques are counted.
Fill in the blank(s) with the appropriate word(s).
Please select the explanation for why the members of the bacterial family Enterobacteriaceae are commonly pathogenic to humans.
A) This family of bacteria commonly inhabits the human body as normal flora. B) Animals have these bacteria as normal flora, and since humans and animals are in close contact, the bacteria are easily transmitted to humans. C) Humans contact these bacteria easily from soil. D) Humans have no inherited resistance to these bacteria. E) As air contaminants, these bacteria easily are transmitted by respiratory route.