Enzymes and Feedback Loops

Insulin is secreted by the pancreas and controls blood sugar levels. When blood sugar level rises, the body responds by secreting insulin into the blood to lower blood sugar levels. When the blood sugar level reaches homeostasis, the pancreas stops releasing insulin. This system is an example of:

• Positive feedback

• Negative Feedback

• Allosteric Regulation

• Acceleration

Tags

NGSS.HS-LS1-3

Based on the graph, which of the following could be used to increase the reaction rate beyond point C?

• increase the amount of substrate

• add more water

• increase the temperature

• decrease enzyme concentration

Tags

NGSS.HS-PS1-5

When a piece of liver is dropped into hydrogen peroxide, the peroxide bubbles vigorously as a result of what reaction?

• peroxide being broken into water and oxygen

• peroxide is destroying the germs in the liver

• more peroxide is being created by the liver

• liver and peroxide are joining together to make a new protein

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Some people cannot digest milk products because they lack a specific enzyme. Which enzyme would be used to break down the lactose in milk?

• hydroxylase

• maltase

• peroxisomes

• lactase

On the image, which letter represents the enzyme?

• A

• B

• C

• D

On the image, which letter represents the substrate?

• A

• B

• C

• D

On the image, which letter represents the product of the reaction?

• A

• B

• C

• D

Enzymes are composed of what organic molecule?

• sugars

• DNA

• fatty acids

• proteins

Tags

NGSS.HS-LS1-1

Enzymes change the _____ of a chemical reaction.

• type

• rate

• products

• reactants

Tags

NGSS.HS-PS1-5

Enzymes are designed for very specific chemical reactions.

• True

• False