Tag Archives: Biology

Otter Future

In a small lake, sea urchins graze upon small grasses that grow on the bottom. After the introduction of an exotic sea urchin, the small grasses became over grazed and absent. To solve the problem, a species of otter is introduced into the lake to predate upon the sea urchins, and the balance between the urchins and sea grasses is restored. What would be the appropriate term for the otter that was introduced?

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Favored Reaction in Thermodynamics

According to the second law of thermodynamics, which of the following reactions would be favored?

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Primitive Atmosphere

According to scientists, Oparin and Haldane, which of the following gases were present in the primitive atmosphere?

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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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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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