Howell-CellMembraneYTQ

What is osmosis?

• The movement of solute particles across a membrane.

• The movement of water across a semi-permeable membrane.

• The movement of large molecules into a cell.

• The process of boiling an egg.

What is the purpose of soaking a raw egg in vinegar for 24-48 hours in an osmosis experiment?

• To cook the egg.

• To harden the egg membrane.

• To remove the hard outer shell of the egg.

• To make the egg absorb more water.

What is the primary function of a cell membrane?

• To provide structural support to the cell.

• To control the movement of substances into and out of the cell.

• To produce energy for the cell.

• To store genetic material.

Which of the following organisms possesses a cell membrane?

• Bacteria

• Plants

• Fungi

• All of the above

In the Fluid Mosaic Model of the cell membrane, what does the term 'fluid' refer to?

• The watery environment inside the cell.

• The ability of the membrane components to move around.

• The liquid state of the cell membrane at room temperature.

• The presence of water channels in the membrane.

What characteristic describes a phospholipid molecule due to having both a polar head and nonpolar tails?

• Amphiphilic

• Hydrophilic

• Hydrophobic

• Nonpolar

Which part of a phospholipid molecule is attracted to water?

• The nonpolar tails

• The polar head

• The integral proteins

• The cholesterol

How do phospholipids arrange themselves in a bilayer to keep the nonpolar regions away from water?

• With their polar heads facing inward

• With their nonpolar tails facing outward

• With their nonpolar tails facing each other in the middle

• With their polar heads randomly distributed

What property of the cell membrane is described by the fluid mosaic model?

• Its rigid structure

• Its ability to transport large molecules

• Its flexibility and movement of components

• Its impermeability to all substances

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

• To connect phospholipids

• To act as a transport channel

• To prevent phospholipids from becoming too packed

• To increase membrane fluidity