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Membrane Proteins and Their Characteristics

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Membrane Proteins and Their Characteristics

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Questions and Answers

What is the approximate percentage of proteins found in chloroplast membranes?

30%

70% (correct)

50%

40%

Which amino acids are typically found in the lipophilic interface of integral proteins?

Glu, Asp, Arg

Alanine, leucine, isoleucine

Trp, His, Tyr (correct)

Phenylalanine, glycine, valine

What type of forces are responsible for the interaction between the hydrophobic side chains of integral proteins and fatty acid side chains?

Hydrogen bonds

Ionic bonds

Disulfide bonds

Van der Waals forces (correct)

What is the typical structure of integral proteins found in the membrane?

All of the above Signup and view all the answers

Which of the following is an example of an integral protein?

Glycophorin A Signup and view all the answers

What type of bonds are involved in the association of integral proteins with the membrane?

Ionic bonds and hydrogen bonds Signup and view all the answers

What is the primary function of lipid-anchored proteins in the membrane?

To act as receptors for signaling pathways Signup and view all the answers

What is the role of amphipathic alpha helix in the membrane?

To form non-polar core with the membrane Signup and view all the answers

What is the primary function of hydrogen bonds in the membrane?

To hold cells in place and give cells and tissues their structure Signup and view all the answers

What is the primary function of protein domains in the membrane?

To bind with ligands and trigger signaling pathways Signup and view all the answers

What is the primary function of anion exchange proteins in the membrane?

To facilitate transport of anions across the membrane Signup and view all the answers

What is the main function of Band 3 protein in blood plasma?

Exchanging HCO3- with CI- ions Signup and view all the answers

What is the primary function of the SARS-CoV-2 spike protein?

Mediating viral cell entry Signup and view all the answers

What is the characteristic of integral proteins with multiple helices?

They contain 2-12 transmembrane segments Signup and view all the answers

What is the function of the transmembrane domain of the SARS-CoV-2 spike protein?

Anchoring the protein in the viral membrane Signup and view all the answers

What is the name of the process mediated by the Band 3 protein in blood plasma?

Chloride Shift Signup and view all the answers

What is the type of protease that the SARS-CoV-2 spike protein binds to on the host cell membrane?

Type 2 TM serine protease Signup and view all the answers