Tag Archives: MCAT

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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Plane-Polarized Light

Which of the following molecules do not rotate the plane of plane-polarized light?

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Know Your Thermo

Describe the reaction below.

PCl3(g) + Cl2(g) -> PCl5(g); Delta(Hf) = -87.9kJ/mol

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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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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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Chemical Species

A high intensity peak in the mass spectrum of 2,2-dimethylpentane is observed at m/z 57. What chemical species does this peak represent?

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Rates of Consumption

During the reaction to form ammonia from nitrogen and hydrogen according to the reaction: N2(g) + 3 H2(g) <-> 2 NH3(g), ammonia was being produced at the rate of 1.50 mol.L-1.s-1.

What were the respective rates of consumption of nitrogen and hydrogen at this time?

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Benzoic Acid

(Fill in the blanks) Benzoic acid can be extracted into water from an organic solvent using _________ and then removed from the water into an organic solvent by the addition of _________.

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