Enzymes

What is an enzyme?

• A protein that speeds up chemical reactions

• A protein that breaks apart molecules

• A protein needed for cell structure

• A neurological protein involved in cell signaling

Tags

NGSS.HS-LS1-6

What is activation energy

• The energy released after chemical reactions

• The energy required to start a chemical reaction

• Energy absorbed by chemical reactions

• The energy required to activate Mr Davin to get out of bed in the morning

An enzyme speeds up a reaction by

• lowering the activation energy.
• raising the activation energy.
• releasing energy.
• absorbing energy.

Tags

NGSS.HS-PS1-5

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 .
  

Catabolic processes

• make complex molecules from simpler ones
• break complex molecules into simpler ones
• occur only in autotrophs
• occur only in heterotrophs

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Endergonic reactions require:

• an input of energy
• a release of energy
• do not change energy

Tags

NGSS.HS-PS1-4

Enzymes need certain environmental conditions in order to function properly.  What happens when enzymes are heated to a high temperature?

• they die
• they denature
• they change their amino acid sequence
• they work better

Reaction rate decreases when the temperature decreases because

• cold temperatures denature the enzyme

• the enzyme freezes

• there are fewer collisions between enzyme and substrate

• there are too many collisions between enzyme and substrate

Tags

NGSS.HS-PS1-5

Which of the following has a reversible effect on an enzyme?

• Denaturation

• Competitive inhibition

• Non competitive inhibition