3.2.1 Cell Structure

Question 1

What are Eukaryotic Cells?

Answer 1

Eukaryotic cells contain a nucleus and membrane-bound organelles

Question 2

What is the STRUCTURE of the Cell-Surface Membrane

Answer 2

• Surrounds a cell
• Made of phospholipids and proteins

Question 3

What is the FUNCTION of the Cell-Surface Membrane

Answer 3

Controls the movement of substance (ions, molecules) into and out of the cell

Question 4

What are the STRUCTURES of a Nucleus 4

Answer 4

Nuclear Envelope - Double plasma membrane with pores which controls what goes in and out of the nucleus
Nucleoplasm - Similar to the cytoplasm. Contains Chromatin
Nuclear Pores - Allows the passage of large molecules such as mRNA out of the nucleus
Nucleolus - Manufactures ribosomal RNA and assembles ribosomes

Question 5

What is the FUNCTION of a Nucleus

Answer 5

• Acts as the control centre through the production of mRNA and rRNA
• Retains genetic material to from DNA na d chromosomes
• Manufactures of rRNA and ribosomes

Question 6

What is the STRUCTURE of Mitochondria

Answer 6

1. DOUBLE MEMBRANE STRUCTURE
   - Outer Membrane - Controls what goes in and out of the mitochondria
   - Inner Membrane - Folds to from Cristae
2. Cristae
3. Matrix
4. Mitochondrial DNA is present so that the mitochondria can produce their own ribosomes

Question 7

What is Cristae (Mitochondria)

Answer 7

Cristae is an extension of inner membrane. It has a large Surface Area for the attachment of enzymes and other protiens that are involved in areobic respiration

Question 8

What is the Matrix (Mitochondria)

Answer 8

Remainder of the mitochondria. (Fluid) and contains enzymes for aerobic respiration, producing ATP.

Question 9

What is the FUNCTION of Mitochondria