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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

Prokaryotic Organisms Flashcards

All 7 cards in this deck

What is a prokaryotic cell?: A cell with no nucleus — its genetic material is a single loop of chromosomal DNA free in the cytoplasm.
What is plasmid DNA?: Small rings of extra DNA in a bacterial cell, separate from the chromosomal DNA.
What is the function of a flagellum in a bacterium?: A long whip-like tail that rotates to move the bacterium (makes it motile).
Which sub-cellular structures do bacterial cells share with animal cells?: Cell membrane, cytoplasm and ribosomes.
True or false? Bacteria do not have ribosomes.: False. Bacteria do have ribosomes (smaller than those in eukaryotes) for making proteins.
How does the size of a bacterial cell compare with that of an animal cell?: Much smaller — bacteria are about $1\ \mu\text{m}$ across, animal cells about $10$ – $100\ \mu\text{m}$ .
True or false? A bacterial cell keeps its chromosomal DNA inside a nucleus.: False. Bacteria have no nucleus \u2013 the chromosomal DNA is a single loop free in the cytoplasm.