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Summary Biology Unit 2 AQA ALEVEL New Spec Full Revision Notes
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Full Revision Notes on Unit 2 A-Level Biology; Cells.
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Section 2: CellsEukaryotic vs Prokaryotic Cells?
- Eukaryotic = animal/pllan cell, has membrane bound organelles
(nucleus, endoplasmic retculum, ol i apparaaus, lysosome,
miaochondria).
- Prokaryotic = bac eria, has no membrane bound organelles.
What are the two forms of reproductioo?
- Sexual – 2 plaren s (each provides a ameae which fuse ao form a zy oae,
which develops inao or anism).
- Asexual – 1 plaren o plroduce genetically identical oosplring.
Defioe a tissuei oraao aod oraao system?
- Tissue = a groupl of splecialised cells.
- Organ = made of dioeren tissues.
- Organ sys em = dioeren organs working oge her.
What is ao aoimal cell made of?
- Organelles (nucleus, endoplasmic retculum, ol i apparaaus, lysosomes,
miaochondria, ribosomes).
- Cy opllasm (siae of chemical reacton).
- Cell membrane (holds cell conaenas ao eaher, conarols whaa
enaers/leaves cell, cell si nallin ).
Structure of oucleus?
- DNA (made of enes, enes code for makin proaeins) wraplpled around
his ones o form chromatin.
- Double membrane called nuclear envelople, which con ains plores.
- Nucleolus a cen re of nucleus plroduces mRNA.
- Res of nucleus made upl of Nucleopllasm (conaains ahe DNA/chromatn).
Plasma membraoe?
Regula es movemen of subs ances in and ou of he cell.
Eodoplasmic reticulum?
- Rough – has ribosomes (siae of proaein synahesis) on he surface.
- Smoo h – no ribosomes, syn hesises liplids.
Golai apparatus?
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