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Protein Structure and Function Quiz

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Questions and Answers

What is the main driving force for the folding of a globular protein?

Salt bridge
Hydrophobic effect (correct)
Disulfide bonds
pKa values

Which type of protein has a more complex shape, fibrous or globular?

Globular protein (correct)
Conjugated protein
Buffer
Fibrous protein

Which group of amino acids are considered hydrophilic?

Group 4: negatively-charged amino acids
Group 2: polar amino acids (correct)
Group 1: hydrophobic amino acids
Group 3: positively-charged amino acids

What is the purpose of post-translational modifications of proteins?

To alter the protein after translation (B) Signup and view all the answers

What does pKa indicate about an acid?

Strength of the acid (D) Signup and view all the answers

Do all 20 standard proteinogenic amino acids have ionizable side chains?

Some do and some don't (A) Signup and view all the answers

What is the impact of the hydrophobic effect on protein folding?

It causes polar amino acids to be on the protein's exterior and nonpolar amino acids to be in the protein's interior. (A) Signup and view all the answers

Why does isomer selection matter for pharmaceuticals?

It affects the drug's ability to bind to receptors and maximize efficacy. (C) Signup and view all the answers

Which standard amino acid is achiral and why?

Glycine, due to its lack of a chiral center. (A) Signup and view all the answers

Where does a protein's net charge primarily come from?

From the positively charged amino groups and negatively charged carboxyl groups in amino acids. (C) Signup and view all the answers

What role do acetylation and phosphorylation play in chromatin remodeling?

They recruit chromatin remodeling complexes, influencing gene expression. (C) Signup and view all the answers

How does pH impact a protein's net charge?

Higher pH leads to a more positive net charge on proteins. (A) Signup and view all the answers