Cell Bio 1

Which of the following is NOT a major type of phospholipid found in cells?

• Phosphatidylserine

• Phosphatidylcholine

• Phosphatidylethanolamine

• Triglyceride

What effect do cis double bonds in fatty acids have on membrane fluidity?

• Increase membrane fluidity

• Decrease membrane fluidity

• Have no effect on membrane fluidity

• Make the membrane rigid

Which type of fatty acid has straight chains that stack neatly and result in low membrane fluidity?

• Saturated fats

• Unsaturated fats

• Trans fats

• Essential fats

What is the function of cholesterol at low temperatures in the membrane?

• Increases fluidity

• Decreases fluidity

• Acts as a receptor

• Creates kinks in fatty acids

Which factor increases membrane fluidity?

• High temperature

• Low temperature

• Saturated fatty acids

• High cholesterol at high temperature

What is the main function of receptor proteins in the cell membrane?

• Communication and detection of external signals

• Transport of molecules across the membrane

• Providing structural support

• Increasing membrane fluidity

Which type of protein spans the entire membrane and is embedded within the bilayer?

• Integral (Transmembrane) proteins

• Peripheral proteins

• Lipid-bound proteins

• Glycoproteins

What is the main function of channel proteins?

• Passive transport of molecules

• Active transport of ions

• Cell recognition

• Anchoring the cell

Which type of protein is loosely attached to the membrane surface and is easily detached?

• Peripheral proteins

• Integral proteins

• Carrier proteins

• Lipid-bound proteins

What is required for carrier proteins to move substances against the concentration gradient?

• ATP/energy

• Water

• Oxygen

• Glucose