Roles of Redox Reactions and H-Carrier Molecules in Metabolism

Where are the substances mentioned in the text initially released from?

Blood vessels
Digestive system
Respiratory system
Body tissues (correct)

Which of the following processes do the substances undergo within the body tissues?

Absorption
Chemical transformations (metabolism) (correct)
Excretion
Transportation

What is one of the purposes of the metabolic processes mentioned in the text?

Storing nutrients
Synthesizing new molecules
Regulating body temperature
Releasing energy (correct)

In which tissues do the metabolic processes mentioned in the text occur?

All tissues (C) Signup and view all the answers

Which of the following is NOT mentioned in the text as a part of the metabolic processes?

Anabolism (B) Signup and view all the answers

Which type of compounds, in addition to ATP, have high energies of hydrolysis?

Other phosphorylated compounds (C) Signup and view all the answers

What is the significance of phosphorylated compounds with high energies of hydrolysis?

They release energy when broken down (B) Signup and view all the answers

What does a large negative G0 value for hydrolysis indicate?

High bond stability (B) Signup and view all the answers

Why are phosphorylated compounds important in biological processes?

They carry high-energy bonds for cellular activities (B) Signup and view all the answers

What is a common characteristic of compounds with high phosphoryl-group transfer potential?

They participate in energy transfers (C) Signup and view all the answers

What is the primary role of redox reactions in metabolism?

To transfer electrons between molecules (C) Signup and view all the answers

Which of the following is an example of an H-carrier molecule?

NAD+ (C) Signup and view all the answers

What is the primary function of H-carrier molecules in metabolism?

To shuttle hydrogen atoms or electrons (D) Signup and view all the answers

Which of the following is a consequence of redox reactions in metabolism?

Production of ATP (C) Signup and view all the answers

How do H-carrier molecules participate in redox reactions?

By both donating and accepting protons (A) Signup and view all the answers

What is the primary function of NAD+ in cells?

To facilitate oxidation reactions (C) Signup and view all the answers

If all the NAD in a cell is in the reduced form (NADH), what would be the consequence?

Oxidation reactions would not be possible (B) Signup and view all the answers

Which of the following statements about NAD+ is incorrect?

It can be transported across the cell membrane (D) Signup and view all the answers

What is the relationship between NAD+ and NADH?

They are different forms of the same coenzyme (B) Signup and view all the answers

In which cellular process is the NAD+/NADH ratio particularly important?

Cellular respiration (C) Signup and view all the answers

What is the primary use of the free energy released during cellular respiration?

To drive ATP synthesis (B) Signup and view all the answers

Which of the following molecules are oxidized during cellular respiration and can be reused in catabolism?

NAD+ and FAD (A) Signup and view all the answers

What is the primary function of ATP in a cell?

To provide energy for cellular processes (C) Signup and view all the answers

Which of the following statements about cellular respiration is true?

It is a process that releases energy from glucose (B) Signup and view all the answers

What is the role of NAD+ and FAD in cellular respiration?

They are electron carriers that can be reused (B) Signup and view all the answers