Which of the following statements about the loop of Henle is correct?
A. The thick segment of the ascending limb is
impermeable to water.
B. The descending limb actively transports
electrolytes into the interstitial fluid.
C. Water moves from the interstitial fluid into
the descending limb of the loop of Henle.
D. The filtrate is more concentrated when it
leaves the loop of Henle than when it enters
the loop.
E. All of these answer options are correct.
A
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George Beadle and Edward Tatum used auxotrophs to determine their "one gene–one enzyme" hypothesis. An auxotroph is best described as:
A. a defective enzyme. B. a result of nondisjunction. C. a mutant unable to grow on minimal media. D. a wild-type version of a model organism. E. an organism with a dominant lethal mutation.
The types of human genes most likely to be duplicated, resulting in multiple copies, are
_____ genes controlling basic tissue development. _____ immune system genes. _____ genes for cell surface receptors. _____ genes for controlling basic metabolism.
Answer the following statements true (T) or false (F)
1. In the organismic model, communities are superorganisms. 2. A forest community consists of not only the trees and shrubs, but also the animals and microorganisms. 3. If one species in a community is very common this will increase measures species diversity. 4. The time hypothesis suggests communities diversify with age. 5. South Texas has the highest bird species richness in the continental United States.
Which of the following occurs during systolic pressure?
a. The ventricles contract. b. The atria contract. c. Both the ventricles and atria contract. d. The heart is at rest.