Which of the following can be mutated to result in constitutive expression from the lac operon?
A) lacZ and lacP
B) lacZ and lacI
C) lacO and lacI
D) lacO and lacZ
E) lacI and lacY
C
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Answer the question using the accompanying figure. The muscle indicated by the letter ‘B’ is analogous to the ____
muscle in a human.
a. calf b. deltoid c. biceps d. tongue e. triceps
If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?
A. 85X B. 950X C. 100X D. 95X E. 850X
What feature of mycobacteria is responsible for the unusually slow growth of these bacteria?
A. Their low tolerance for oxygen retards their growth. B. They cannot fully metabolize carbohydrates and must rely on fermentation. C. They have limited numbers of ribosomes so protein production is slow. D. The mycolic acid in their cell walls requires signification metabolic investment. E. They lack a cell wall and are extremely fragile.
Which of the following is considered “specific” immunity?