You are a microbiologist working with a new species of bacteria thriving in soil at 15°C. In the lab, you find this bacterium adjusts well to growth at 37°C
If this bacterium were "typical," what changes would you expect to find in the fatty acid composition of the membrane as the bacteria undergo homeoviscous adaption?
What will be an ideal response?
Answer: Expected would be an increase in the average length of the membrane lipid fatty acid chains from 16 to 18 carbons and an increase in their overall saturation (decrease in C=C double bonds), both of which would increase the melting temperature of the membrane. Stearate is an example of a fatty acid that fits both of these criteria and might be found at higher levels following the temperature change.
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DNA and RNA are alike in
a. the pentose sugar. b. all the nitrogenous bases used to assemble the genetic code. c. the number of strands. d. their function in genetics. e. none of these.
The major function of a receptor is to
a. control the autonomic functions of the body. b. stabilize the internal environment to achieve homeostasis. c. produce responses to the various stimuli the body receives. d. give organisms or cells awareness of and sensitivity to their environment. e. do none of these.
Which body system is directly responsible for protecting an animal from disease?
a) circulatory system b) immune system c) nervous system d) endocrine system
Organisms implicated in microbially influenced corrosion include ALL of the following EXCEPT
a. sulfate reducers. b. ferrous-iron-oxidizing bacteria. c. ferric-iron-oxidizing bacteria. d. methanogens.