What this topic covers
Cells has 4 subtopics:
- Cell structure
- All cells arise from other cells
- Transport across cell membranes
- Cell recognition and the immune system
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AS Level AQA Biology · Topic 2 of 4
Cells – AS Level AQA Biology revision notes
Choose a subtopic. Cells covers Cell structure, All cells arise from other cells, Transport across cell membranes, and Cell recognition and the immune system in AS Level AQA Biology. 18 lessons in 4 subtopics.
Revise Cells for AS Level AQA Biology, including Cell structure, All cells arise from other cells, and Transport across cell membranes.
18
Lessons
4
Subtopics
Cells lessons by subtopic
18 lessons, grouped by subtopic.
Cell structure
- Prokaryotic Cell Structure: Inside and Out
- Prokaryotic Cell Features: Plasmids, Capsule, and Flagella
- Viruses: Acellular Structure
- Microscopy Techniques
- Cell Fractionation and Ultracentrifugation
- Exploring Eukaryotic Cells: Nucleus, Membranes, and Energy
- Eukaryotic Organelles: Golgi, Lysosomes, and Endoplasmic Reticulum
- Specialisation and Organisation in Eukaryotic Cells
All cells arise from other cells
Transport across cell membranes
- Passive Transport: Diffusion and Osmosis
- Active Transport and Co-transport
- Cell Adaptations and Membrane Permeability
Cell recognition and the immune system
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Frequently asked questions
What is Cells?
Cells covers Cell structure, All cells arise from other cells, Transport across cell membranes, and Cell recognition and the immune system in AS Level AQA Biology. 18 lessons in 4 subtopics.
What are the stages of mitosis?
The four stages of mitosis are prophase, when chromosomes condense and the nuclear envelope breaks down; metaphase, when chromosomes line up at the equator attached to spindle fibres by their centromeres; anaphase, when spindle fibres shorten and pull sister chromatids to opposite poles; and telophase, when nuclear envelopes reform around each set. The The Cell Cycle and Mitosis notes cover this in full.
What is osmosis?
Osmosis is the net movement of water molecules from a region of higher water potential to a region of lower water potential across a partially permeable membrane, without the use of metabolic energy. The Passive Transport: Diffusion and Osmosis notes cover this in full.
What is the function of the cell wall?
The cell wall is a layer external to the cell surface membrane that provides structural support and rigidity. The Specialisation and Organisation in Eukaryotic Cells notes cover this in full.
What is active transport?
Active transport is the movement of molecules or ions across a cell membrane against their concentration gradient, using energy from the hydrolysis of ATP and specific carrier proteins. The Active Transport and Co-transport notes cover this in full.
What is an antigen?
An antigen is a molecule, usually a protein or glycoprotein, on the surface of a cell, pathogen or toxin that is recognised as foreign by the immune system and stimulates an immune response. The Cell Recognition and Immune Response: Antigens and Phagocytosis notes cover this in full.
What is Fick's law?
Fick's Law states that the rate of diffusion is proportional to surface area and concentration gradient, and inversely proportional to the thickness of the membrane. The Passive Transport: Diffusion and Osmosis notes cover this in full.
What is a plasmid in bacteria?
A plasmid is a small, circular DNA molecule found in prokaryotic cells, separate from the main chromosomal DNA. The Prokaryotic Cell Features: Plasmids, Capsule, and Flagella notes cover this in full.
What is the structure of a virus?
A virus particle has three components: genetic material, which is DNA or RNA; a capsid, a protein coat of repeating subunits called capsomeres that protects the genetic material; and attachment proteins on the surface, which bind to specific receptors on host cells. The Viruses: Acellular Structure notes cover this in full.