3.6 Prokaryotic cells and viruses

Question 1

Compare nd contrast the strutcure of eukaryotic and prokaryotic

Answer 1

Eukaryotic has membrane bound organelles like mitochondria and endoplasmic reticulum prokaryote doesnt
Euk has nucleaus Prok doesnt
The DNA in Euk is long and linear DNa in Prok is short and circular
Euk has larger ribosomes(80s) than Prok(70s)
Cell wall only in plants algae and fungi for Prok they all hace cell walls
Plasmids and never present in euk but are present in prok
Euk are larger than Prok

Question 2

Describe the general structure of a virus particle

Answer 2

1. nuceluic acids surround by a capsid
2. attatchment proteins allow attatchment to specifc host cells
   3.no cytoplasm ribosomes and cell wall
   4.some also surrounded bu a lipid envelope

Question 3

What are the distinguishing features of prokaryotic cells?

Answer 3

*Cytoplasm lacking membrane bound organelles
*So genetic matieral not encolesed in a nucleus

Question 4

Describe the general structure of prokarytoic cells

Answer 4

The organalles that arealways present are
Cell surface membrane
Cell wall
Cytoplasm
Smalll ribosomes(70s)
Circular DNA-Not associated with proteins and Free in cytoplasm
The ones that are sometimes present
Capsule
Plasmids- small rings of DNA
Flagella

Question 5

Explain why viruses Are described as accelular and non living

Answer 5

Acellular- Not made of cells no cell membrane/cytoplasm/organelles
Non living-Has no metabolism, Cannot independently move/respire/replicate/excrete