The FIRST step in the Krebs cycle is combination of an acetyl group with oxaloacetic acid, leading to the formation of

a) lactic acid.
b) pyruvic acid.
c) citric acid.
d) acetyl CoA.


Ans: c) citric acid.

Biology & Microbiology

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The genetic relatedness of two siblings is

A) 2.0. B) 1.0. C) 0.5. D) 0.25. E) 0.75.

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When an impulse passes from one neuron to the next,

it a. passes directly from dendrite to axon. b. passes from axon to cell body to dendrite. c. bypasses the cell bodies of both. d. passes from the output zone of one to the input zone of the other. e. undergoes repolarization.

Biology & Microbiology

The major function of a receptor is to

a. control the autonomic functions of the body. b. stabilize the internal environment to achieve homeostasis. c. produce responses to the various stimuli the body receives. d. give organisms awareness and sensitivity to their environment by converting a stimulus to an action potential (nerve impulse). e. interpret the sensations it receives from the environment

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The last stage of succession is the 

A. early community. B. climax community. C. biome community. D. pioneer community.

Biology & Microbiology