Placoderms were among the first fishes to display
a. jaws.
b. gill openings.
c. cartilaginous skeletons.
d. jaws and gill openings.
e. jaws, gill openings, and cartilaginous skeletons.
Answer: a
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In the light-independent reactions of photosynthesis, CO2 is added to a five-carbon molecule known as
A. cellulose. B. ribose. C. deoxyribose. D. RuBP. E. CAM.
How can a signal be amplified?
a. Activation of the signal propagation network can cause the signal to collapse and not propagate. b. Signal activation can result in phosphorylation of unrelated receptors and the propagation of different types of signals. c. Activation of a receptor-linked enzyme can activate many copies of the response molecule. d. A cascade of upstream events can result in activation at inappropriate times when the signal is not intended.
The fluid portion of blood is known as blood ________; this portion constitutes approximately ________ % of the total blood volume
Fill in the blank(s) with correct word
Which hypersensitivity disorder is the result of cell-mediated response?
A) type I B) type II C) type III D) type IV E) both type I and II