Smaller birds tend to lay smaller eggs with a smaller yolk supply than larger birds. This would be recognized as an example of
a. down regulation.
b. a preadaptation.
c. genetic fitness.
d. a cost-benefit trade off.
e. intrinsic control.
d
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One of the functions of blood is to regulate fluid levels in the body. If too much fluid escapes from the bloodstream and enters the tissues, blood pressure will
A. increase. B. decrease.
Bill wants to determine his blood type, so he takes a few drops of blood from a puncture wound in his finger and mixes it with various antisera. His blood cells agglutinate when mixed with the anti-A serum but not with the anti-B. Therefore this is true:
A) Bill's plasma contains B antibodies. B) Bill could donate blood to an individual with type B blood. C) Bill could receive type B blood in a transfusion. D) Bill's plasma would cross-react with type O red blood cells. E) Bill is Rh positive.
Fruits, maple syrup, and sugar are all sources of
A. lactose. B. cellulose. C. sucrose. D. nitrogen.
Which ion(s) at least initially lowered the frog heart rate?
A) sodium B) potassium and sodium C) potassium D) calcium E) calcium, potassium and sodium