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Biology

GCSE · AQA

QuestionsFlashcards

Communicable Diseases
Monoclonal Antibodies
- Producing Monoclonal Antibodies
  6
- Uses of Monoclonal Antibodies
  7
Plant Disease
- Detection and Identification of Plant Diseases
  6
- Plant Defence Responses
  6

Eukaryotes & Prokaryotes Flashcards

All 7 cards in this deck

What is a eukaryotic cell?: A cell whose genetic material is enclosed in a nucleus, and which also has a cell membrane and cytoplasm.
e.g. all plant and animal cells
What structures does a prokaryotic (bacterial) cell have?: Cytoplasm and a cell membrane surrounded by a cell wall, plus ribosomes; its genetic material is not enclosed in a nucleus.
Give the similarities between a prokaryotic cell and a eukaryotic cell.: Both have cytoplasm, a cell membrane, ribosomes and DNA (genetic material).
Roughly how does the size of a bacterial cell compare with the size of a plant or animal cell?: Bacteria are much smaller: about $1\ \mu$ m across, compared with about $10$ – $100\ \mu$ m, so 1–2 orders of magnitude smaller.
True or false? The cell wall of a bacterium is made of cellulose, just like a plant cell wall.: False. Only plant and algal cell walls are made of cellulose; a bacterial cell wall is made of different material.
What is a plasmid?: A small ring of DNA in a bacterial cell, separate from the single DNA loop. A bacterium may have one or more.
True or false? The genetic material of a bacterial cell is enclosed in a nucleus.: False. It is a single loop of DNA free in the cytoplasm, not enclosed in a nucleus.