About 180 liters of blood plasma is filtered into human nephrons per day and, of that amount, about 2-3 liters leaves the body as urine. Therefore, the percentage of plasma filtrate that leaves as urine each day is about ________.
A. 0.1-0.2 percent
B. 0.5-1.0 percent
C. 1-2 percent
D. 5-10 percent
E. 10-20 percent
F. 20-50 percent
Answer: C
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When a dog's brain detects the need to dissipate excess heat and the dog begins to pant, the brain acts as the _________________, and the panting behavior acts as the ________________.
A. stimulator; effector B. integrating center; sensor C. integrating center; effector D. sensor; integrating center
Cancer is a single disease that affects one in three Americans.
Answer the following statement true (T) or false (F)
The significance of the Hershey and Chase
experiments in which 32P and 35S were used is that a. DNA labeled with 35S and proteins labeled with 32P can be traced in the course of an experiment. b. they demonstrated that DNA labeled with 32P is transferred from the bacteriophage to the virus. c. they established that proteins labeled with 35S become deactivated and unable to be transferred. d. they demonstrated that bacteriophages transfer their DNA, not their protein coats, into their hosts. e. DNA may be the hereditary material; although, bacteriophages transfer both DNA and proteins into their hosts.
With a light microscope, observation of which of the following would allow discrimination between a prokaryote and a eukarkyote?
a. the cell membrane b. a nucleus c. flagella d. a cell wall