Cell Structure

Question 1

Features of a Prokaryotic cell ?

Answer 1

• No membrane bound organelles
• Smaller ribosomes
• No nuclear envelope , Circular DNA free in cytoplasm

Question 2

Features of a Eukaryotic cell ?

Answer 2

• Has a Nuclear envelope holding DNA
• Rough and Smooth Endoplasmic Reticulum
• Lysosomes

Question 3

Features of a Light Microscope ?

Answer 3

• Stain needed to see structures clearly
• Low resolution and magnification
• Uses lamp below stage to illuminate sample

Question 4

Features of a Scanning Electron Microscope (SEM) ?

Answer 4

• Generates a 3D image
  *No stain needed
  Specimen must be dead as vacuum required

Question 5

Features of a Transfer Electron Microscope (TEM) ?

Answer 5

• Generates a 2D image
• No stain needed
• Specimen must be dead as a vacuum is required

Question 6

How does a SEM generate an image ?

Answer 6

Sends a beam of electrons at the specimen then gathers scattered electrons

Question 7

How does a TEM generate an image ?

Answer 7

Sends beam of electrons through specimen and detects electrons that pass through

Question 8

What is Resolution ?

Answer 8

The smallest distance between 2 objects where they can still be distinguished as 2 separate entities