IGCSE biology - enzymes

Enzymes are _____________?

• Hydrocarbons

• Hormones

• Lipids

• Proteins

Tags

NGSS.HS-LS1-1

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-PS1-5

NGSS.HS-LS1-7

An enzyme is a catalyst.

• True
• False

Where do substrates (biological molecules) bind on an enzyme?

• voltage-gated channels

• surface receptor

• calcium channels

• active site

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

Tags

NGSS.HS-PS1-5

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered denature
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

Tags

NGSS.HS-PS1-5

Letter C...

• active site
• enzymes
• substrate
• products

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

What is the optimal pH for this enzyme?

• 6

• 10

• 9

• 7

Changes in pH and temperature can ___________________ an enzyme which causes it to lose its shape and affects its function.

• puncture

• denature

• double

• delete

Tags

NGSS.HS-PS1-5

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

• reusable

• catalyst

• specific

• fragile