Sub-Cellular Structures.

Question 1

Nucleus:

Answer 1

• It controls the activities of the cell.
• Contains the organism’s genetic material, arranged as chromosomes.
• Therefore determines the cell’s appearance and function.
• Contains instructions to make new cells or new organisms.

Question 2

Mitochondria:

Answer 2

• Where respiration happens.
• Special protein molecules, called enzymes, enable glucose and oxygen to react together.
• The reactions transfer vital energy to the organism.

Question 3

Cell Membrane:

Answer 3

• Selective barrier that controls which substances pass in/out of cell.
• Membrane also contains receptor molecules.

Question 4

Cytoplasm:

Answer 4

A “jellylike” substance. The chemical reactions that keep the cell alive happen here.

Question 5

Chloroplast:

Answer 5

• Contain green chlorophyll.
• Transfers energy from the Sun to the plant as light- used in photosynthesis.
• Only in green parts of plant.

Question 6

Vacuole:

Answer 6

• Full of cell sap, a watery solution of sugar and salts.
• Helps to keep the cell rigid,
• Supports plant + keeps it upright.

Question 7

Cell Wall.

Answer 7

• Surrounds the cell.
• Made of a tough fibre called cellulose.
• Makes wall rigid.
• Supports cell.