Biochemistry Lecture 4: Proteins Classification

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What is the main characteristic of fibrous proteins?

Form enzymes

Contain prosthetic groups

Spherical shape

Insoluble in water (correct)

Which of the following is an example of a globular protein?

Keratin

Elastin

Hemoglobin (correct)

Collagen

How are simple proteins classified?

Dissolve in water

Are insoluble in water

Contain prosthetic groups

Contain only amino acid residues (correct)

Which type of proteins contain heme as a prosthetic group?

Conjugated proteins Signup and view all the answers

How are globular proteins different from fibrous proteins?

Fibrous proteins dissolve in water Signup and view all the answers

What is the main characteristic of protein molecules according to the text?

Twisted and folded into a complex three-dimensional structure Signup and view all the answers

What level of protein structure is described as the sequence of amino acids in the peptide chain?

Primary structure Signup and view all the answers

Which type of protein structure is characterized by hydrogen bonds between the amide and carbonyl groups of amino acids along the chain?

Secondary structure Signup and view all the answers

What stabilizes the coiled shape of the alpha helix in protein structure?

Hydrogen bonds Signup and view all the answers

Which protein structure is characterized by bending and folding into a specific three-dimensional shape?

Tertiary structure Signup and view all the answers

What type of interactions stabilize the tertiary structure of a protein?

Hydrogen bonds and hydrophobic interactions Signup and view all the answers

Which protein structural level involves protein chains lying side by side in a parallel arrangement?

Secondary structure Signup and view all the answers

What type of bonds hold together two or more polypeptide chains in a larger protein complex?

Hydrogen bonds Signup and view all the answers

What is the specific term used to describe the arrangement of subunits in a larger protein complex?

Quaternary structure Signup and view all the answers

Which of the following is NOT a denaturing agent for proteins?

Heme groups Signup and view all the answers

How does denaturation affect the structure of a protein?

It causes the structure to become random and disorganized. Signup and view all the answers

In hemoglobin, what does the heme group in each subunit do?

Transports oxygen in the blood. Signup and view all the answers

Which of the following is NOT a substance that can denature proteins?

Cell membranes Signup and view all the answers