Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

A) 10-10 M
B) 10-4 M
C) 10-7 M
D) 10.0 M


Ans: A) 10-10 M

Biology & Microbiology

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Cells of Staphylococcus aureus are cocci measuring about 1 ?m in diameter.  In a textbook image of S. aureus, each cell measures about 1 cm.  The magnification of the image on the page is ________.

A. 0.001X B. 10,000X C. 0.0001X D. 1,000X E. 100X F. 0.01X G. This is impossible to calculate without more information.

Biology & Microbiology

The net reproduction per individual per unit time (r)

is __________ per mouse per month in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5

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Which of the following human sex chromosome genotypes is not possible?

a. Y_ b. XXY c. XY d. X_ e. XX

Biology & Microbiology

Transfer of genetic materials involving the so called "jumping genes"

A. Transduction B. Transformation C. Conjugation D. Transposition

Biology & Microbiology