A temporary change in the conformation of a nitrogenous base is called ______
A. Depurination
B. A tautomeric shift
C. Deamination
D. None of the answers are correct
B
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A new serotype of Vibrio cholerae, V. cholerae 0139, has picked up the ability to produce
A. pili. B. flagella. C. capsules. D. toxin.
Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You repeat
Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism appears green, just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
Answer the following statements true (T) or false (F)
1. The penicillin molecule is an example of a hapten. 2. Autoimmune diseases are always the result of type II hypersensitivity reactions. 3. With respect to a particular pathogen, detection of antibodies in a patient's blood provides better proof of current infection than does detection of antigens. 4. If a person's immune system is not functioning properly, that person is said to be immunocompetent. 5. An IgM molecule can bind to 10 antigenic determinants, but they would all have to be the antigenic determinant that stimulated the production of that IgM molecule.
Which of the following reactions is most likely to be exergonic? Select all correct choices
A. the synthesis of a phospholipid from glycerol and fatty acids B. the replication of DNA from free nucleotides C. the formation of cellulose from individual glucose molecules D. the digestion of protein from food into amino acids