Cells

Question 1

What is the structure of eukaryotic cell and their function ?

Answer 1

Cell membrane - receptors on cell for cell recognition
RER- synthesise proteins , proteins processed/folded/ transmitted in RER
Golgi apparatus - packages proteins, produces lysosomes
cell vacuole - contains cell sap store sugar and amino acids etc and maintains turgor pressure

Question 2

Difference between tissue, organ and organ system

Answer 2

Tissue is a group of specialised cells, organ is aggregation of tissue and organ system is a group of organs.

Question 3

Compare and contrast the structure of eukaryotic and prokaryotic cell (6 marks )

Answer 3

• Eukaryotic has membrane bound organelles e.g mitochondria whereas prokaryotic doesn’t
• Eukaryotic has larger (80s) ribosome in the cytoplasm whereas prokaryotic has a smaller (70s ribosome )
  -In eukaryotic cell cell wall is only in plants ,algae and fungi containing cellulose or chitin whereas in prokaryotic cells it contains murein
• In eukaryotic DNA is long and linear and is associated with histone protein whereas in prokaryotic it is short and circular and isn’t associated with histone proteins.
• eukaryotic larger size overall prokaryotic much smaller size
• eukaryotic has nucleus containing DNA whereas prokaryotic doesn’t have nucleus and dna is free floating