Biology 2nd quiz

Question 1

What is the function of the cell membrane?

Answer 1

Controls what goes in and out of the cell.

Question 2

What are the different parts in the cell membrane?

Answer 2

• Proteins: look like wide balls
• Lipids: in between the phosphate balls
• Sugars: look like the y on the proteins
• Phosphates: The balls around the cell

Question 3

Particle Model of Matter:

Answer 3

1. All matter is made up of particles that can be different in size and composition.
2. The particles are always moving (move the least in solids and more in gases)
3. The particles are attracted to one another or bonded together.
4. Paticles have spaces between them.

Question 4

what are the 5 main ways of transport in a cell?

Answer 4

1. Osmosis
2. Diffusion
3. Facilitated Diffusion
4. Active transport
5. Endocytosis and exocytosis

Question 5

Diffusion:

Answer 5

The natural movement of particles from an area of high concentration to an area of low concentration.
- No energy is involved (passive transport)

Question 6

Osmosis:

Answer 6

The natural movent of water across a cell membrane from an area of high concentration to low concentration.
- No energy is involved (passive transport)

Question 7

Different water movements:

Answer 7

1. Hypotonic: Water enters the cell and the solutes leave the cell. The cell then becomes bigger in size.
2. Hypertonic: Water leaves the cell and the solutes enter the cell. The cell then shrinks in size.
3. Isotonic: The size of the cell stays the same and nothing leaves or enters the cell.

Question 8

Faciltated Diffusion:

Answer 8

Involves the use of a protein to move substances across the cell.
- Passive transport (no energy is involved)
- Goes from an area of high concentration to an area of low concentration.

Question 9

Chanel proteins and carrier proteins:

Answer 9

Chanel Proteins: Creates a tunnel for water-soluble particles to move through.
Carries Proteins: Attach to larger molecules to pull them across.

Question 10

Active Transport:

Answer 10

• Requires energy for transport.
• Goes from an area of low to high concentration.
• Requires ATP
• Gets its energy from the mitochondria

Question 11

Endocytosis and Exocytosis:

Answer 11

Endocytosis: Particles entering a cell
Exocytosis: Particles leaving a cell
Both require energy (active transport).