Cells and Chemistry of Life

Front

What is the plasma membrane?

Back

The plasma membrane is a biological membrane that separates and protects the interior of all cells from the external environment. It is composed of a phospholipid bilayer with embedded proteins.

Front

Where is water least likely to be found in the plasma membrane?

Back

Water is least likely to be found in the hydrophobic (water-repelling) regions of the plasma membrane, particularly within the lipid bilayer.

Front

What is cohesion in the context of water?

Back

Cohesion is the property of water molecules to stick together due to hydrogen bonding, which allows for processes like capillary action.

Front

What are the products of photosynthesis?

Back

The products of photosynthesis are oxygen and glucose, which are produced from carbon dioxide and water using sunlight.

Front

How does temperature affect enzyme activity?

Back

Enzyme activity generally increases with temperature up to a certain point, after which high temperatures can denature the enzyme, reducing its effectiveness.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process of passive transport that allows substances to cross membranes with the assistance of special proteins, without the use of energy.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What role do enzymes play in biological reactions?

Back

Enzymes act as catalysts that speed up chemical reactions in the body by lowering the activation energy required for the reaction.

Front

What is the significance of the surface tension of water?

Back

Surface tension is the cohesive force at the surface of water that allows it to resist external force, enabling small objects to float and organisms to move on its surface.