Diffusion

The video tutorial explains diffusion in both biological and physical contexts. In biology, diffusion is described as the movement of small molecules across a cell membrane from an area of high concentration to low concentration. In physics, diffusion involves the reflection or refraction of radiation, such as light or sound, by an irregular surface, causing it to scatter in multiple directions.

What is the primary characteristic of diffusion?

• Movement in a circular pattern

• Movement in a straight line

• Movement from high to low concentration

• Movement from low to high concentration

In biological systems, how do small molecules typically move across cell membranes?

• Through active transport

• By diffusion

• Using endocytosis

• Via osmosis

Which process allows small molecules to pass through cell membranes without energy?

• Endocytosis

• Facilitated diffusion

• Diffusion

• Active transport

In physics, what does diffusion refer to?

• Concentration of sound waves

• Transmission of heat

• Reflection or refraction of radiation

• Absorption of light

What happens to light or sound when it encounters an irregular surface in the context of diffusion?

• It is focused into a beam

• It is scattered in many directions

• It is absorbed

• It is amplified