What characterises prokaryotic cells? (4) - correct answer ✔1. much smaller
in comparison
2. have a cytoplasm and cell membrane surrounded by cell wall
3. genetic material is a single DNA loop not enclosed in a nucleus
4. may be 1 or more small rings of DNA called plasmids
Millimetre - correct answer ✔mm, thousandth of a metre, 10^-3m
Micrometre - correct answer ✔μm, millionth of a metre, 10^-6m
Nanometre - correct answer ✔nm, billionth of a metre, 10^-9m
Nucleus - correct answer ✔Contains genetic information and controls cell's
activities
Cell membrane - correct answer ✔Controls the passage of substances in
and out of the cell e.g. glucose and ions
, Cytoplasm - correct answer ✔Where most chemical reactions take place
Ribosomes - correct answer ✔Where protein synthesis takes place
Mitochondria - correct answer ✔Where aerobic respiration takes place
Chloroplasts - correct answer ✔Where photosynthesis occurs because
contain chlorophyll (in plant cells)
Plasmids - correct answer ✔Small rings of DNA which code for very specific
features such as antibiotic resistance (in bacterial cells)
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