MBIO 3401 EXAM 2 QUESTIONS AND ANSWERS 2026
The first experimental evidence that genes are composed of DNA rather than protein
was published by: - Answers - Oswald Avery, Colin MacLeod, and Maclyn McCarty
In terms of chemical structure, what distinguishes DNA from RNA? - Answers - two or
more of the above answers are correct
A nucleotide molecule (such as ATP) is composed of what chemical groups? - Answers
- a pentose sugar, a phosphate group, and a purine or pyrimidine base
The correct logarithm form of the exponential growth equation is: - Answers - log N = log
N0 + 0.301(t-t0)/g
Which of the following statements best expresses the meaning of exponential growth of
bacteria? - Answers - the number of cells in the population doubles during a constant
time interval
The time required for cells in a microbial population to grow, divide, and produce twice
the number of cells that existed before is called the: - Answers - generation time
After stationary-phase bacteria are inoculated into fresh culture medium, what happens
before cell elongation is observed to occur? - Answers - two or more of the above
answers are correct
the most common type of cell division in yeast cells is: - Answers - budding
what is the change in concentration of protons (H+) when going from pH 7.0 to pH 4.0?
- Answers - from 1x10-7 M to 1x10-4 M
lack of the enzymes superoxide dismutase and catalase in certain bacteria may explain
differences in: - Answers - ability to grow in the presence of oxygen
you have just isolated a novel bacterium from an anaerobic environment. In terms of its
relationship to oxygen, what type of microorganism would this be? - Answers - further
testing is required since it could be any one of several of the above types
an organism that requires an inorganic compound as its hydrogen (electron) donor for
growth is called a: - Answers - lithotroph
Thought question: A student wishes to grow E. coli in the laboratory on a defined
mineral salts medium. He includes glucose, potassium phosphate, sodium ammonium
phosphate, and magnesium chloride in the medium. Will E. coli grow in this culture
medium? - Answers - No, because he forgot to include a sulfur source
The first experimental evidence that genes are composed of DNA rather than protein
was published by: - Answers - Oswald Avery, Colin MacLeod, and Maclyn McCarty
In terms of chemical structure, what distinguishes DNA from RNA? - Answers - two or
more of the above answers are correct
A nucleotide molecule (such as ATP) is composed of what chemical groups? - Answers
- a pentose sugar, a phosphate group, and a purine or pyrimidine base
The correct logarithm form of the exponential growth equation is: - Answers - log N = log
N0 + 0.301(t-t0)/g
Which of the following statements best expresses the meaning of exponential growth of
bacteria? - Answers - the number of cells in the population doubles during a constant
time interval
The time required for cells in a microbial population to grow, divide, and produce twice
the number of cells that existed before is called the: - Answers - generation time
After stationary-phase bacteria are inoculated into fresh culture medium, what happens
before cell elongation is observed to occur? - Answers - two or more of the above
answers are correct
the most common type of cell division in yeast cells is: - Answers - budding
what is the change in concentration of protons (H+) when going from pH 7.0 to pH 4.0?
- Answers - from 1x10-7 M to 1x10-4 M
lack of the enzymes superoxide dismutase and catalase in certain bacteria may explain
differences in: - Answers - ability to grow in the presence of oxygen
you have just isolated a novel bacterium from an anaerobic environment. In terms of its
relationship to oxygen, what type of microorganism would this be? - Answers - further
testing is required since it could be any one of several of the above types
an organism that requires an inorganic compound as its hydrogen (electron) donor for
growth is called a: - Answers - lithotroph
Thought question: A student wishes to grow E. coli in the laboratory on a defined
mineral salts medium. He includes glucose, potassium phosphate, sodium ammonium
phosphate, and magnesium chloride in the medium. Will E. coli grow in this culture
medium? - Answers - No, because he forgot to include a sulfur source
