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If a polypeptide gets smaller, which bond/ force/ interaction was most likely broken?

Van der Waals interaction.
Ionic bond (electrostatic interaction).
Hydrogen bond.

Peptide bond.

Peptide bonds are covalent bonds. In module 1, what did you learn was required to make and break covalent bonds in biology?

Tertiary structure
pH
Enzymes
Charged R-groups.

In a soluble protein in the cytosol, where are clusters of hydrophobic amino acid residues found?

Folded inside the protein.
Exposed on the surface of the protein.

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Jean Keeling
Jean KeelingLv2
6 Jul 2018
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Related questions

1. The level of protein structure that is stabilized primarilyby non-covalent interactions between the side chains within asingle polypeptide chain is refered to as its:

A) primary structure

B) secondary structure

C) tertiary structure

D) quaternary structure

E) none of the above

2. Collagen, a strong fibrous protein found in connectivetissue, bone, and the extracellular matrix, has a structure inwhich three left-handed helices wind around each other to form aright-handed triple helix. The primary structure of collagen has arepeat unit of -(Gly-X-Pro)- Which of the following bonds stabilizethe collagen triple helix? (mark all that apply)

A) Hydrogen bonds between hydroxyproline residues

B) Hydrogen bonds between N-H and C=O

C) Ionic bonds between amino acid side chains

D) Hydrogen bonds between charged amino acids

3. The non-covalent forces that stabilize the Beta-strandconformation of peptides include:

A) H-bonds between amide C=O and amide NH

B) Van der Waals packing between the peptide backbone atoms

C) Van der Waals packing due to side chain interdigitation

D) Only A and B above

E) None of the above

4. What is the approximate length difference of a 22-kDasingle-stranded ?-helical protein segment vs. a 22-kDasingle-stranded ?-strand protein segment? Assume a mean residuemass of 110 Da. Show work.


5. Circular dichroism measurements have shown that the peptidebackbone of poly-l-lysine (KKKKKKK) adopts a random coilconformation at pH 7.0, but becomes ?-helical as the pH is raisedabove 10. This observation is known as the

1. In biology, the term "ionic bond" is used differently than inchemistry. A biological "ionic bond" is used to describe theinteraction of an R group containing a carboxyl group(–COO–) with an R group containing an amino group(–NH3+). From this description, what do youunderstand a biological "ionic bond" to be?

a. van der waals interaction

b. hydrogen bond

c. Electrostatic interaction

d. covalent bond

2. The three dimensional arrangement of alpha helices,beta-sheets and other parts of the polypeptide chain is called

a. primary structure

b. secondary strucutre

c. tertiary structure

d. quaternary structure

3. Multiple polypeptide chains are held together by

a. peptide bond

b. intermolecular forces

4. What holds multiple polypeptides together? (Choose bestanswer)

a. R groups

b. amino groups

c. carboxylate group

5. Which of the following single-celled organisms is an exampleof a prokaryote?

a. algae

b. yeast

c. amoeba

d. bacteria

6. Which of the following is an insect most closely relatedto?

a. tree

b. mushroom

c. fish

d. bacteria

7. In evolutionary history, which was the most ancientdivergence?

a. Prokaryotes and eukaryotes

b. Birds and reptiles

c. Rats and mice

d. Plants and animals

8. In evolutionary history, which was the most recentdivergence?

a. Prokaryotes and eukaryotes

b. Birds and reptiles

c. Rats and mice

d. Plants and animals

9. What is the chemical equation for ATP synthesis?

a. ADP + Pi ⟶ ATP + H2O

b. ATP + H2O ⟶ ADP + Pi

c. ADP + H2O ⟶ ATP + Pi

d. ATP + Pi ⟶ ADP +H2O

9. What is glycolysis?]

a. It is the oxidation of three-carbon molecules into carbondioxide.

b. It is the splitting of six-carbon sugars into three carbonmolecules with the synthesis of ATP.

c. It is the transport of electrons to power the synthesis ofATP.

d. It is the synthesis of sugars from carbon dioxide.

10. What chemistry concept describes whether a reaction orprocess can occur spontaneously?

a. therodynamics

b. kinetics

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