The Krebs cycle is considered a cycle because ________ is regenerated
a. -ketoglutarate
b. acetyl-CoA
c. citrate
d. oxaloacetate
d
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Ehrlichiosis, Rocky Mountain Spotted Fever, dengue fever, and tularemia are all infectious diseases of the cardiovascular system. What feature do they have in common?
A. They are all transmitted by arthropod vectors. B. People with immune deficiencies are especially susceptible to these diseases. C. They are all endemic in the mountain states in the western U.S. D. The causative agent of each of these diseases is a bacterium.
The source region in the pressure flow explanation of phloem transport is most often the ____
a. root b. flower c. stem d. leaf e. soil
Uracil will pair with
a. ribose. b. adenine. c. cytosine. d. thymine. e. guanine.
The net movement of substances to regions of lower concentration is called
A. facilitation. B. active transport. C. diffusion. D. osmosis.