Cell Membrane Structure and Function

What is the primary function of the cell membrane as described in the fluid mosaic model?

• To store genetic information

• To produce proteins

• To separate the cell's interior from the external environment

• To provide energy to the cell

Which part of the phospholipid is hydrophilic?

• The hydrocarbon tails

• The phosphate head

• The entire molecule

• None of the parts

What term describes molecules that have both hydrophilic and hydrophobic parts?

• Hydrophobic

• Hydrophilic

• Amphipathic

• Bipolar

How do phospholipids arrange themselves in a bilayer?

• Randomly arranged

• Hydrophilic heads facing the water

• Hydrophobic heads facing the water

• Hydrophilic tails facing each other

What is a protocell, as mentioned in the context of phospholipid bilayers?

• A fully developed cell

• A genetic material

• A primitive cell-like structure

• A type of protein

What role do glycolipids play in cell membranes?

• They provide energy to the cell

• They assist in cell-cell recognition

• They produce proteins

• They store genetic information

What is the function of transmembrane proteins?

• To replicate DNA

• To store energy

• To transport molecules across the membrane

• To produce lipids

How does cholesterol affect the cell membrane?

• It makes the membrane more rigid

• It has no effect on the membrane

• It increases the membrane's fluidity

• It decreases the membrane's fluidity

What is the consistency of the cell membrane described as?

• Solid like a rock

• Rigid like a balloon

• Fluid like oil or salad dressing

• Sticky like glue

Why is the model called the 'fluid mosaic model'?

• Because it is made of a single component

• Because it is rigid and unchanging

• Because it is composed of various components that can move

• Because it is a solid structure