Chapter 6 review

Ubiquitin

• 
  

  is attached to improperly folded proteins and targets them for degradation.

• targets proteins for degradation.

• targets proteins for degradation and post-translational processing.

The primary complexes for protein synthesis and degradation in eukaryotes are _________blank and _________blank, respectively

• ribosomes; lysosomes

• ribosomes; proteasomes

Patients with McArdle's Disease lack an enzyme in their livers that catabolizes glycogen. These individuals tire easily during exercise. Which of the following would best explain this symptom?

• Glycogen must be broken down to glucose to be used in metabolism.

• 
  Glycogen synthesis increases the energy available to cells during exercise.

In a catabolic reaction, electrons from food are

• removed by oxidation and stored in NADH.

• added by oxidation and stored in ATP.

• removed by reduction and stored in NADH.

Tags

NGSS.HS-LS1-7

Your liver produces 90% of the cholesterol found in your body. When cholesterol levels get too high, the first enzyme in the pathway of cholesterol synthesis is inhibited. This is an example of

• feedback inhibition

• positive feedback

Tags

NGSS.HS-LS1-3

How can a living cell increase the rate of a chemical reaction?

• by a catalyst

• by raising temp

Tags

NGSS.HS-PS1-5

The primary function of an enzyme or any biological catalyst is to

• reduce the energy of activation of a reaction.

• reduce the energy of activation and increase the rate of a reaction.

Tags

NGSS.HS-PS1-2

If one were to double the amount of enzyme in a reaction with an initial ΔGΔG of −5 kcal/mole, what would the ΔG be?

• 
  −5 kcal/mole

• +5 kcal/mole

Tags

NGSS.HS-PS3-1

A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?

• • 
    

    Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells.

• Living cells make the water warmer, speeding up the reaction.

• Enzymes in the cell catalyze the breakdown of glucose.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Which of the following is true of ribozymes?

• made of RNA

• they cannot catalyze reactions