Cell Membrane Structure and Function

The video explores the fluid mosaic model of cell membranes, explaining why it's called 'fluid' and 'mosaic.' It delves into the structure of phospholipids, their amphipathic nature, and how they form bilayers. The video also discusses the role of proteins, glycolipids, glycoproteins, and cholesterol in the membrane, highlighting the dynamic and fluid nature of the membrane that allows it to maintain separation between the cell's internal and external environments.

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