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Biology
All Cells Arise from Other Cells
AQAA-Level
Master the foundation of all biology: Cells. This comprehensive guide covers cell structure, specialisation, microscopy, and cell division, providing the essential knowledge needed to secure top marks in your GCSE exams.
Biology
Being non-living, viruses do not undergo cell division. Following…
AQAA-Level
7402
Biology
Binary fission in prokaryotic cells involves: replication of the circular…
AQAA-Level
7402
Biology
Division of the cytoplasm (cytokinesis) usually occurs, producing two new…
AQAA-Level
7402
Biology
DNA replication occurs during the interphase of the cell cycle.
AQAA-Level
7402
Biology
Eukaryotic cells that do retain the ability to divide show a cell cycle.
AQAA-Level
7402
Biology
Many cancer treatments are directed at controlling the rate of cell…
AQAA-Level
7402
Biology
Meiosis is covered in section 3.4.3 Students should be able to: recognise…
AQAA-Level
7402
Biology
All cells arise from other cells: Mitosis is a controlled process.
AQAA-Level
7402
Biology
Mitosis is the part of the cell cycle in which a eukaryotic cell divides…
AQAA-Level
7402
Biology
Required practical 2: Preparation of stained squashes of cells from plant…
AQAA-Level
7402
Biology
The behaviour of chromosomes during interphase, prophase, metaphase,…
AQAA-Level
7402
Biology
The role of spindle fibres attached to centromeres in the separation of…
AQAA-Level
7402
Biology
Uncontrolled cell division can lead to the formation of tumours and of…
AQAA-Level
7402
Biology
Within multicellular organisms, not all cells retain the ability to divide.
AQAA-Level
7402
Biology
Alteration of the Sequence of Bases
AQAA-Level
Unlock top marks by mastering how a single change in a DNA base can have catastrophic effects on a protein's structure and function. This guide breaks down the complete causal chain, from mutation to non-functional enzyme, giving you the precise language and exam technique AQA rewards.
Biology
Due to the degenerate nature of the genetic code, not all such mutations…
AQAA-Level
7402
Biology
Gene mutations might arise during DNA replication. They include addition,…
AQAA-Level
7402
Biology
Gene mutations occur spontaneously.
AQAA-Level
7402
Biology
Mutations can result in a different amino acid sequence in the encoded…
AQAA-Level
7402
Biology
Some gene mutations change only one triplet code.
AQAA-Level
7402
Biology
Some gene mutations change the nature of all base triplets downstream from…
AQAA-Level
7402
Biology
Students should be able to relate the nature of a gene mutation to its…
AQAA-Level
7402
Biology
The mutation rate is increased by mutagenic agents.
AQAA-Level
7402
Biology
A single molecule of adenosine triphosphate (ATP) is a nucleotide…
AQAA-Level
7402
Biology
The hydrolysis of ATP can be coupled to energy-requiring reactions within…
AQAA-Level
7402
Biology
The inorganic phosphate released during the hydrolysis of ATP can be used…
AQAA-Level
7402
Biology
An index of diversity describes the relationship between the number of…
AQAA-Level
7402
Biology
Biodiversity can relate to a range of habitats, from a small local habitat…
AQAA-Level
7402
Biology
Farming techniques reduce biodiversity. The balance between conservation…
AQAA-Level
7402
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