Cell Membrane Structure and Function

What is the initial purpose of soaking a raw egg in vinegar for an osmosis experiment?

• To harden the egg yolk.

• To remove the outer shell, exposing the semi-permeable membrane.

• To cook the egg without heat.

• To increase the egg's volume.

Why are cells typically very small?

• Smaller cells require less energy to function.

• Smaller cells have a higher surface area to volume ratio, allowing for efficient transport.

• Smaller cells are less likely to be damaged.

• Smaller cells can reproduce faster.

A 1mm cube has a surface area to volume ratio of 6:1. If the cube's dimensions are increased to 3mm, how does its surface area to volume ratio change?

• It increases to 18:1.

• It remains the same at 6:1.

• It decreases to 2:1.

• It becomes 1:1.

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What does the "fluid" aspect of the Fluid Mosaic Model imply about the cell membrane?

• The membrane is primarily composed of water.

• The membrane components are static and do not move.

• The membrane components are constantly moving and not static.

• The membrane can easily dissolve in water.

What characteristic describes a phospholipid due to its polar head and nonpolar tails?

• Hydrophobic

• Hydrophilic

• Amphiphilic

• Nonpolar

What is the primary role of cholesterol in the cell membrane at varying temperatures?

• It acts as a channel for water molecules.

• It helps maintain membrane fluidity by preventing phospholipids from packing too tightly at low temperatures and connecting them at high temperatures.

• It provides structural support, making the membrane rigid.

• It serves as a receptor for cell signaling.

What is the main difference between peripheral and integral proteins in the cell membrane?

• Peripheral proteins are involved in transport, while integral proteins are for cell recognition.

• Peripheral proteins are loosely attached to the membrane surface, while integral proteins span across the entire membrane.

• Peripheral proteins are only found on the outer surface, while integral proteins are only on the inner surface.

• Peripheral proteins are made of lipids, while integral proteins are made of carbohydrates.

What is a key function of both glycoproteins and glycolipids in the cell membrane?

• They regulate the movement of water across the membrane.

• They provide energy for cellular processes.

• They are involved in cell recognition and cell signaling.

• They form the structural backbone of the membrane.