Which of the following best describes the degrees of freedom for the calculation of variance?
A. (n + 1)
B. 2(n + 1)
C. (n - 1)/n
D. (n - 1)
D
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You are part of a team that discovers a new nitrogen-fixing bacteria in symbiosis with a plant. As you study this new bacteria, you discover that it is photosynthetic. This bacteria is likely to be:
A. cyanobacteria. B. actinobacteria. C. proteobacteria. D. none of the above.
In the lac operon, if lactose is present, which of the following occurs?
A. Lactose bind to RNA polymerase, which then binds to the promoter and transcribes the needed genes. B. Lactose binds to the repressor, changing its shape so that it does not bind to the operator. RNA polymerase then transcribes the needed genes. C. Lactose binds to the operon, which attracts RNA polymerase, then transcription of the needed genes occurs. D. Lactose binds to the repressor, changing its shape so that it can bind to the operator and the structural genes are not expressed.
Assume that in a Hardy-Weinberg population, 9 percent of the individuals are of the homozygous recessive phenotype. What percentage are homozygous dominant?
What will be an ideal response?
Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
A) N-acetylglucosamine B) peptidoglycan C) lipoteichoic acid D) endotoxin E) mycolic acid