Portage Learning - CHEM 210 Biochemistry Module 8 Exam (2025 / 2026) Ques & Ans, Exams of Biochemistry

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Chem 210 - Module 8 exam

True or False: The majority of reactions of the urea cycle occur in the cytosol.

TRUE

True or False: NADH yields 1.5 ATP molecules after donating electrons and hydrogenatoms to the electron transfer chain (ETC).

FALSE

True or False: GTP is invested in the urea cycle.

FALSE

True or False: There are six complexes associated with the ETC.

FALSE

True or False: In the production of ATP via ATP synthase, the H+ ions move from the mitochondrial matrix to the intermembrane space.

FALSE

The urea cycle involves reactions (only those in the cyclic portion of the process).

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Question 8

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Which amino acids are involved in the urea cycle?

A. Ornithine B. Aspartate C. Threonine D. Both A and B E. Both A and C D.BOTH A AND B

Fumarate is converted to for it to reenter the mitochondrion.

Ornithine Citrulline Malate Fumarase Ammonia MALATE

Urea is useful for excreting nitrogen from cells due to its:

A. Ability to form London forces B. High density of nitrogen atoms C. Large size D. Low melting point

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C. NO 2

D. NH 3

E. NH4+

E. NH4+

The following chemical species is.

Ammonium Fumarate Arginine Argininosuccinate Urea UREA

FADH 2 donates electrons and H+ to complex.

I

II

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III

IV

V

II

Which of the ETC complexes do pump H+ ions?

Complex I Complex III Complex IV All of the above None of the above ALL OF THE ABOVE

What protein shuttles electrons from Complex III to Complex IV?

NADH dehydrogenase

Cytochrome C Fumarase Cytochrome B None of the above CoQ

In what portion of the mitochondrion does the CAC take place?

Matrix Intermembrane space

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FROM THE MATRIX TO THE INTERMEMBRANE SPACE

Energy released is utilized for the synthesis of ATP.

As protons flow through ATP synthase and back into the mitochondrial matrixIn the digestion of proteins In the degradation of carbohydratesIn the formation of ATP None of the above AS PROTONS FLOW THROUGH ATP SYNTHASE AND BACK INTO THE MITOCHONDRIALMATRIX

The H+ ions flow through what part of the ATP synthase?

A. FO

B. F 1

C. F 2

D. Stator

E. Both A and C

A. FO

An individual with the MERRF disease, tend to have symptoms of.

Muscle weakness Elevated Blood pressureSwollen feet Red eyes None of the above MUSCLE WEAKNESS

ATP synthase is located in the of mitochondria.

A. Inner membrane B. Intermembrane space C. Outer membrane D. Both A and B E. Both B and C A.INNER MEMBRANE

What process results in ATP formation?

A. H 2 O in ATP synthase

B. GTP is produced first

C. Heat applied to ATP synthase

D. Rotation of ATP synthase

E. None of the above

D. ROTATION OF ATP SYNTHASE

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A) citric acid cycle

B) ATP

C) ATP

D) ADP and Pi

E) electron transport chain

According to the chemiosmotic theory, how is the ETC connected to ATP production?Explain in at

least four complete sentences.

The chemical reactions of the ETC provide energy to pump H+ ions from the mitochondrial matrix into the intermembrane space. The reactions also provide electrons and H+ to convert oxygen into water. The net resultis that the H+ gradients permit a flow H+ to rotation ATP synthase, producing ATP.

nt is formed more clearly (be specific that the ETC transport creates a gradient).

Consider the importance of the mitochondria in energy production.

A. What structural features of mitochondria support ATP formation?

And

B. Where are the complexes of the ETC located in Mitochondria?

This organelle is the central hub of energy production in the cell and has a complicated structure, including two membranes. The mitochondrion has an outer membrane and an inner membrane. The outer membrane is a bilayer with porin proteins that permit ions and molecules to cross intothe intermembrane space. The intermembrane space is the solution between the outer and inner membranes. The inner membrane is a highlyselective bilayer permitting only select ions and molecules to cross. The selectivity is crucial for maintaining specific concentrations of H+, ATP, and other species in the mitochondrial matrix. The inner membrane also contains the electron transport chain's protein complexes, which acceptsthe electrons from the coenzymes. The matrix is the innermost space of mitochondrion, where the citric acid cycle occurs along portions of fatty acid oxidation and the urea cycle. Once the NADH and FADH 2 are produced by the citric acid cycle, they are in proximity to the electron transport chain, so that donation of electrons and hydrogen ions is efficient.