Theme B Do Now Extra Credit Quick Quiz

Which of the following best explains the role of R-groups in amino acids?

• They link amino acids together through peptide bonds.

• They determine the chemical properties and interactions of the amino acid.

• They stabilize the secondary structure of proteins.

• They are identical in all amino acids.

The secondary structure of a protein is stabilized by:

• Ionic bonds between R-groups.

• Hydrogen bonds between the backbone atoms.

• Hydrophobic interactions in the protein core.

• Disulfide bridges between cysteine residues.

Which of the following bonds or interactions is NOT involved in the tertiary structure of proteins?

• Hydrogen bonds

• Peptide bonds

• Ionic bonds

• Hydrophobic interactions

A quaternary protein structure:

• Always contains disulfide bridges.

• Is formed by interactions between multiple polypeptide chains.

• Is the sequence of amino acids in a polypeptide chain.

• Is determined by the hydrophilic nature of its R-groups.

Which protein is an example of a fibrous protein?

• Hemoglobin

• Myoglobin

• Collagen

• Insulin

Cholesterol in animal cell membranes:

• Prevents the membrane from being too fluid at high temperatures.

• Makes the membrane more permeable to ions.

• Only interacts with proteins in the membrane.

• Decreases the membrane’s ability to form vesicles.

The sodium-potassium pump is an example of:

• Passive transport.

• Facilitated diffusion.

• Primary active transport.

• Secondary active transport.

What feature of mitochondria maximizes ATP production?

• Cristae that increase surface area for the electron transport chain.

• Double membrane structure.

• Presence of ribosomes.

• High concentration of DNA.

Which organelle is primarily involved in the synthesis and packaging of proteins?

• Smooth endoplasmic reticulum

• Rough endoplasmic reticulum

• Golgi apparatus

• Nucleus

The fluidity of the lipid bilayer depends on:

• The presence of unsaturated fatty acids.

• The amount of carbohydrates attached to the lipids.

• The ionic bonds in the membrane.

• The pH of the surrounding environment.