Energy Reactions in Cells

Question 1

What is metabolism?

Answer 1

The set of processes which derive energy and raw materials from food

Question 2

True or False:

Catabolic pathways are reductive (use H)

Answer 2

FALSE

Catabolic pathways are oxidative - release H atoms

Question 3

True or False:

Anabolic pathways are oxidative (release H)

Answer 3

FALSE

Anabolic pathways are reductive (use H)

Question 4

True or False:

In an exergonic reaction, /\G < 0 and the reaction is spontaneous whereas in an endergonic reaction, /\G > 0 and the reaction is not spontaneous

Answer 4

True

Question 5

When [ATP] is high, what pathways are activated?

Answer 5

Anabolic pathways

Question 6

When [ATP] is low and ADP/AMP are high, what pathways are activated?

Answer 6

Catabolic pathways

Question 7

What reaction is catalysed by myokinase?

Answer 7

2ADP –> ATP + AMP

Question 8

What is phosphocreatine?

Answer 8

A phosphorylated creatine molecule that serves as a rapidly mobilizable reserve of high-energy phosphates in skeletal muscle and the brain.

Question 9

What does creatine kinase do?

Answer 9

Catalyses:

Creatine + ATP <=> Phosphocreatine + ADP

Question 10

How many subunits make up creatine kinase?

Answer 10

2

Question 11

What is creatinine?

Answer 11

Breakdown product of creatine phosphate

Question 12

What is creatinine concentration in urine a marker of?

Answer 12

Urine dilution

Question 13

What is creatine excretion per 24h proportional to?

Answer 13

Muscle mass of the individual