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Catalyzing Chemical Reactions

Enzymes are one of the key proteins in cells and facilitate chemical reactions. How does a typical enzyme catalyze a chemical reaction?

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Cerebrospinal Fluid Producers

Cerebrospinal fluid (CSF) is created by special capillary networks located in the brain. CSF bathes the hollow regions of the brain, spinal cord, and around the central nervous system, within its protective coverings. The areas that the CSF pathway includes are:

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Nerve Impulse Propagation

The velocity of nerve impulse propagation could be increased by:

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Gastrin Secretion

Which of the following statements is NOT true regarding gastrin secretion and function?

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Decreasing Activity of an Enzyme

Some enzymes experience a decrease in activity proportional to the concentration of their products. This phenomenon could be an example of what process?

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Mechanism of Cyanide

The lethal poison cyanide causes death by interfering with cellular respiration. What is cyanide’s mechanism of toxicity?

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Theory of Natural Selection

Which of the following is the most accurate statement regarding the theory of Natural Selection?

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Mammalian Zygote

Once a mammalian zygote has become a blastocyst and implants itself into the uterine wall, it will develop into?

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Inhibition by Penicillin

Penicillin exerts its effect on bacterial growth through inhibition of cell-wall synthesis. This antibiotic blocks the last step in the formation of the cell wall. Glycopeptide transpeptidase is a bacterial enzyme that catalyzes the cross-linking reaction between peptidoglycan molecules, which are the main constituents of the cell wall. Penicillin inhibits the enzyme by binding covalently to its active site. The penicillin-enzyme complex cannot react further.

This is an example of:

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Genetic Drift Effects

Genetic drift is the process responsible for:

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