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Biology

GCSE · Edexcel

QuestionsFlashcards

Photosynthesis
Plant Structure
Transport in Plants
Plant Hormones
- Plant Hormones & Growth
  7
- Using Plant Hormones Commercially
  7

Transport in Animals
- The Need for Transport
  7
- Factors Affecting the Rate of Diffusion
  7
Respiration
- Respiration
  6
- Practical: Investigating Respiration
  5
Gas Exchange
Circulatory System
- The Blood & Blood Vessels
  6
- The Circulatory System
  8

Genetic Variants Flashcards

All 5 cards in this deck

What is a genetic variant?: A different version of a gene, caused by a change in the sequence of DNA bases.
How can a genetic variant in the non-coding DNA of a gene affect phenotype?: It changes how well RNA polymerase binds, altering the quantity of protein produced.
How can a genetic variant in the coding DNA of a gene affect phenotype?: It alters the sequence of amino acids, changing the protein's shape and therefore its activity.
True or false? Genetic variants in non-coding DNA cannot affect an organism's phenotype.: False. They can alter the binding of RNA polymerase and so change the quantity of protein produced.
How can a genetic variant in the coding DNA of an enzyme's gene stop the enzyme working?: The changed amino acid sequence changes the shape of the active site, so the substrate no longer fits.