Cell Membrane, Transport, Hypertonic, Hypotonic, Isotonic

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

Front

Which part of the phospholipid is hydrophobic?

Back

The tails.

Front

What happens to a cell in an isotonic solution?

Back

The cell stays the same size.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space.

Front

In which direction do substances move in a concentration gradient?

Back

Substances move from an area of high concentration to an area of low concentration.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

Which of the following is not an example of active transport?

Back

Facilitated diffusion.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, causing the cell to swell.

Front

What happens to celery sticks placed in pure water?

Back

They are in a hypotonic solution, and the cells will swell.

Front

What is a hypertonic solution?

Back

A hypertonic solution has a higher concentration of solutes compared to the inside of the cell, causing the cell to shrink.