2.1.2 Prokaryotic Cell Structure + Viruses Flashcards
1
Q
What organelles do some prokayrotes contain
A
- One or more plasmids
- Slime capsule
- One or more flagella (flagellum)
1
Q
What organelles do all prokaryotic cells contain
A
- Cell membrane
- Cell wall - murein (a glycoprotein)
- 70s ribosomes (smaller than eukaryotic)
- Single, circular DNA
- Cytoplasm
2
Q
Desribe how prokaryotes differ from eukaryotes
A
- Much smaller
- No membrane-bound organelles
- No membrane bound nucleus
- A singular ring of DNA rather than linear DNA
- DNA not associated with proteins (histones)
3
Q
Describe the nature of a virus
A
Acellular and non-living
4
Q
What components do all viruses contain
A
- Genetic material (DNA/RNA)
- Protein capsid
- Attachment proteins (on protein capsid or lipid envelope)
5
Q
What components do some viruses contain
A
- Lipid envelope
- Enzymes within the matrix (Reverse transcriptase)
6
Q
Draw the structure of a virus
A
7
Q
Function of genetic material in virus
A
Codes for viral proteins
8
Q
Function of capsid proteins in virus
A
Protects genetic material
9
Q
Function of attachment protiens in viruses
A
Bind to receptors on cells
10
Q
Why are viruses acellular
A
Have no cell-surface membrane or organelles
11
Q
Why are viruses non-living
A
They cannot independantly reproduce or respire
