Biology: Enzymes Flashcards Preview

MCAT: Biological Sciences > Biology: Enzymes > Flashcards

Flashcards in Biology: Enzymes Deck (5)
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1
Q

Enzymes

A
  • Lower activation energy of reaction
  • Increase rate of reaction
  • Do not alter equilibrium constant
  • Do not affect overall ΔG of the reaction
  • Neither changed nor consumed in the course of the reaction
  • pH and temperature sensitive
  • Specific for a particular reaction or class of reactions
  • Most enzymatic reactions are reversible
2
Q

Differences between the lock and key theory and induced fit hypothesis?

A

The induced fit hypothesis describes the active site as having some flexibility while the lock and key theory describes a stiffer enzyme

3
Q

What are the two important types of cofactors?

A

Metal cations and small organic groups (coenzmes)

4
Q

What does a low Michaelis constant indicate?

A

High enzyme-substrate affinity, where a lower concentration of substrate is necessary for 50% enzyme saturation

5
Q

Allosteric Enzyme

A

Two or more active sites and can exist in more than one conformation