A urine sample with more than 100,000 organisms is considered indicative of infection. A urine sample containing 5,000 bacteria,with a generation time of 30 minutes,
sits for 3 hours before finally being assayed. How many bacteria will then be present within the sample?
A. 10,000
B. 64,000
C. 100,000
D. 320,000
D
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Some marine species of cyanobacteria
A. do not have flagella and are, therefore, nonmotile. B. do not have flagella but are, nonetheless, motile by some unknown mechanism. C. do not have flagella but are motile by means of pseudopods. D. have flagella and are, therefore, motile.
In female mammals,
A) the maternally inherited X chromosome is shut off in every cell. B) the paternally inherited X chromosome is shut off in some cells. C) one X chromosome is shut off in a germline cell. D) both SRY genes are activated.
Algins, thickening compounds used in the food industry, are obtained from ____
a. foraminiferans b. brown algae c. dinoflagellates d. red algae e. green algae
The structure of DNA explains both its ability to encode genetic information and the way in which it is copied during cell reproduction
Indicate whether the statement is true or false