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
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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.
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
Which of the following human sex chromosome genotypes is not possible?
a. Y_ b. XXY c. XY d. X_ e. XX
Transfer of genetic materials involving the so called "jumping genes"
A. Transduction B. Transformation C. Conjugation D. Transposition