02 Cells 04 Diffusion

Which of the following substances does a typical human cell want to allow in?
There may be more than one correct answer.

• Oxygen

• Waste products.

• Glucose

• All of the above

• Carbon Dioxide.

What is the main function of the cell membrane?

• To produce energy

• To control what enters and leaves the cell

• To store genetic information

• To synthesize proteins

Which of the following are reasons multicellular organisms need transport systems?

• To transport nutrients

• To transport oxygen

• To transport waste products

• To transport light

What is shown in the diagram?

• The digestive system which transports food and nutrients through the body.

• The respiratory system which is used to breathe air in and out.

• The circulatory system (which transports oxygen in the blood).

• The nervous system which is very active when you panic during a difficult quiz.

Cells need to exchange substances with their environments to ______.

• grow

• survive

• reproduce

• move

Large, multicellular organisms need to transport __________ through the entire body.

(a)  

• substances
• substandards
• upstandings
• lights

Unicellular organisms do not need special organ systems to transport substances. They can (a)   substances directly with their ​ (b)   . It's good to be small!

• donate
• exchange
• slower

• environment
• friends
• oxygen

What is one way cells can exchange substances with their environment?

• Difficulty

• Diffusion

• Public transport

• Electrolysis

Which process involves the movement of oxygen from the lungs (specifically the alveoli) into the blood?

• Osmosis

• Diffusion

• Active transport

• Filtration

Which of these is a simple definition of concentration?

• How many particles there are in a given area or volume.

• How many red circles there are on the board.

• Something which goes up and down.

• A red line going downwards.