MBIOS 305 Chapter Notes -Van Der Waals Force, Beta Sheet, Alpha Helix

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notyourrandom

3 Feb 2023

School

WSU

Department

Molecular Biosciences

Course

MBIOS 305

Professor

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Document Summary

First residue is referred to as i+0: each amino acid"s r group, the second residue is referred to as i+1, amino acid sequence read from amino group to carbonyl group. Primary structure: polypeptide chain, link alpha carbonyl group of one amino acid to alpha amino group of another amino acid. Sequence of primary structure is determined by genes. Spatial arrangement of secondary structure sheets or helices into one another. Interactions between amino acids that make up the protein: hydrophobic interactions between nonoplar amino acids, hydrogen bonds, ionic bonds found in hydrophilic interactions. Quaternary structure: arrangement of subunits and interactions among subunits. Subunits = proteins consisting of functional polypeptide chains.

Related Questions

1. A sequence of amino acids in a certain protein is found to be â Ser â Gly â Pro â Gly â

The sequence is most probably part of a(n):

a. beta turn

b. antiparallel beta sheet

c. alpha-helix

d. parallel beta-sheet

e. alapha-sheet

2. Which statement about peptides bonds is NOT TRUE?

There is perfectly free rotation about the peptide bond.

The peptide bond has partial double-bond character.

The peptide bond is shorter than a normal carbon-nitrogen single bond.

The peptide bond usually has a trans configuration with respect to the alpha-carbons of the two amino acids involved in the peptide bond.

Peptide bonds are made via condensation of an amine and a carboxylic acid with loss of water.

3. Which of the following statements about proteins is FALSE?

	Active proteins are generally very loosely structured.
	In water-soluble proteins, hydrophobic amino acid residues are generally buried and not exposed to water.
	Primary structure determines tertiary structure.
	Secondary structure is regular, recurring arrangements in space of nearby amino acid residues in a polypeptide.
	Quaternary structure involves the interaction of subunits in a protein with more than one polypeptide chain.

maroonwallaby335

Which of the following actions would affect the secondary, but not primary, structure of a protein?

break the ionic bonds between amino acids

change the sequence of amino acids

break the hydrogen bonds between amino acids

disrupt the interactions between two different polypeptide chains

byzantiumchinchilla319

Local folding that occurs through hydrogen bonding between the amino group of one atom and the carboxyl group of another atom within the same polypeptide is known as:

Option A: secondary structure.

Option B: primary structure.

Option C: tertiary structure.

Option D: quaternary structure.

orchidmacaw309

MBIOS 305 Chapter Notes -Van Der Waals Force, Beta Sheet, Alpha Helix

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