Membrane proteins:

I) are sometimes covalently attached to lipid moieties.

II) are sometimes covalently attached to carbohydrate moieties.

III) are composed of the same 20 amino acids found in soluble proteins.

IV) move across the membrane unless they are anchored

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 24667

#Unit 2. Cellular Organization

 The transfer of a lipid molecule across a bilayer, a process termed:

TLS Online TPP Program

#Question id: 24668

#Unit 2. Cellular Organization

 Differences between cotransport and active ion transport include

TLS Online TPP Program

#Question id: 24669

#Unit 2. Cellular Organization

Match the following inhibitors (Column I) with their effect (Column II).

TLS Online TPP Program

#Question id: 24670

#Unit 2. Cellular Organization

Which of the following statement(s) is (are) true of V-class proton pumps?

a. They are ATPases.

b. They are present in membranes of plant vacuoles.

c. They serve to decrease the pH inside a lysosome.

d. They can acidify the lumen of an organelle (or the extracellular space) because these pumps are electrogenic

TLS Online TPP Program

#Question id: 24671

#Unit 2. Cellular Organization

Cholesterol and phospholipids are transported between organelles by

i. Golgi-dependent mechanisms.

ii. incompletely characterized vesicle populations.

iii. direct contact between membranes and, to some extent, small, soluble lipid-transfer proteins.

Which of the following statements are correct?

TLS Online TPP Program

#Question id: 24672

#Unit 2. Cellular Organization

Which statement describes the mode of action of the ABCB1 transporter (the first eukaryotic ABC transporter to be recognized)?