HL1 Fall Semester Review 2024

Front

What is a phospholipid bilayer?

Back

A phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier that separates the interior of the cell from the external environment.

Front

What is cohesion in the context of water molecules?

Back

Cohesion is the attraction between water molecules, which allows them to stick together, contributing to phenomena like surface tension.

Front

What is the function of lysosomes in a cell?

Back

Lysosomes are organelles that contain digestive enzymes to break down waste materials and cellular debris.

Front

What is the fine adjustment knob used for in microscopy?

Back

The fine adjustment knob is used to make small adjustments to the focus of a microscope, allowing for clearer viewing of specimens.

Front

What is capillary action?

Back

Capillary action is the ability of water to flow in narrow spaces against gravity, due to cohesive and adhesive forces.

Front

Define surface tension.

Back

Surface tension is the elastic tendency of a fluid surface that makes it acquire the least surface area possible, caused by cohesive forces between liquid molecules.

Front

What role do mitochondria play in a cell?

Back

Mitochondria are known as the powerhouse of the cell, as they produce energy (ATP) through cellular respiration.

Front

What is the difference between adhesion and cohesion?

Back

Adhesion is the attraction between different substances, while cohesion is the attraction between similar substances, such as water molecules.

Front

What is the primary function of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and support.

Front

What is the significance of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.