Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew
Which of the following may explain this result?
A) The colonies may be due to back mutation (reversion).
B) The colonies may be due to recombination.
C) Either A or B is possible.
D) Neither A nor B is possible.
Answer: C
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Archaeal and Bacterial pili are identical in structure and function.
Answer the following statement true (T) or false (F)
What proportion of the offspring of a cross between a red snapdragon (RR) and a white one (rr) will be red?
a. 75% b. 50% c. 0% d. 25%
Which is NOT a correct association of a fungus and product?
A. Aspergillus-soy sauce B. Saccharomyces cerevisiae-beer and wine C. rusts and smuts-truffles D. Penicillium-blue cheese
Which is incorrect about anaerobic respiration?
A. It allows cells to continue to produce ATP through glycolysis. B. Fermentation recycles NADH back to NAD+. C. Some organisms use organic molecules other than oxygen as final electron acceptors. D. Anaerobic respiration consumes a small amount of oxygen. E. When human muscles are lacking oxygen, lactate is produced.