Other Cell Structures - SAT Subject Test in Biology

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Question

____________ are hollow tubes made up of polymerized tubulin that provide support throughout the cell.

Answer

Microtubules are hollow tubes made up of polymerized tubulin that provide support throughout the cell.

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Question

Which of the following characteristics are true of all enzymes?

Answer

Enzymes do not alter the equilibrium constant because enzymes are not consumed in the reaction.

Hint: Write out the equation for the equilibrium constant and notice that there is no variable for enzymes.

Enzymes are sensitive to temperature and pH, as high temperatures and very low pH can cause denaturation of an enzyme. Enzymes are only optimal at certain pH and temperature ranges.

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