Enzymes Foundation

Which of the following statements regarding enzymes is true?

• Enzymes increase the rate of a reaction by making the reaction more exergonic

• Enzymes increase the rate of a reaction by lowering the activation energy barrier

• Enzymes increase the rate of a reaction by reducing the rate of reverse reactions

• Enzymes change the equilibrium point of the reactions they catalyze

Tags

NGSS.HS-PS1-5

What is structure A?

• Substrate

• Active site

• Enzyme

• Products

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusable
• catalyst
• specific
• fragile

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Tags

NGSS.HS-PS1-5

Which of the following is true for all exergonic reactions?

• The products have more total energy than the reactants

• The reaction proceeds with a net release of free energy

• A net input of energy from the surroundings is required for the reactions to proceed

• The reactions are rapid

What kind of inhibition for Enzyme A?

• competitive inhibition

• feedback inhibition

• noncompetitive inhibition

• cooperativity inhibition

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

What kind of inhibition for Enzyme B?

• competitive inhibition

• noncompetitive inhibition

• cooperativity

• activator

Which of the following statements is true concerning catabolic pathways?

• They supply energy, primarily in the form of ATP, for the cell's work

• They combine molecules into more energy-rich molecules

• They are spontaneous and do not need enzyme catalysis

• They build up complex molecules such as protein from simpler compounds

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Allosteric enzyme regulation is usually associated with

• feedback inhibition

• lack of cooperativity

• the need for cofactors

• an enzyme with more than one subunit