Cell BiologyAQA GCSE Biology (8461)

Cell Structure

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

PreviousNext

Practice progress

6 MCQs

0 of 6 attempted

Correct

Incorrect

Remaining

Practice — Cell Structure

1
Which feature is found in a eukaryotic cell but NOT in a prokaryotic cell?
Answer & explanation
Correct: option C
Ribosomes, cell membrane and cytoplasm are present in both cell types. Only eukaryotic cells have a true (membrane-bound) nucleus.
2
A bacterium has a length of $3\times10^{-6}\,\text{m}$ . What is this length in micrometres?
Answer & explanation
Correct: option B
1 µm = $10^{-6}\,\text{m}$ , so $3\times10^{-6}\,\text{m}$ = 3 µm.
3
Which of these is a plasmid?
Answer & explanation
Correct: option B
A plasmid is a small extra loop of DNA found in prokaryotes. Plasmids can carry useful genes like antibiotic resistance and can be passed between bacteria.
4
A typical animal cell is about 20 µm across. Express this length in metres in standard form.
Answer & explanation
Correct: option B
20 µm = $20\times10^{-6}\,\text{m}$ = $2\times10^{-5}\,\text{m}$ . Option D is the right magnitude but not in standard form (A must be between 1 and 10).
5
Which statement about prokaryotes is correct?
Answer & explanation
Correct: option D
Prokaryotes have no nucleus — DNA sits free in the cytoplasm as a single loop. Their wall is peptidoglycan, not cellulose, and they are typically much smaller (1–10 µm) than animal cells (10–30 µm).
6
An animal cell is $1\times10^{-5}\,\text{m}$ across. A bacterium next to it is $1\times10^{-6}\,\text{m}$ . How many times bigger is the animal cell?
Answer & explanation
Correct: option A
$\dfrac{1\times10^{-5}}{1\times10^{-6}} = 10^{-5-(-6)} = 10^{1} = 10$ . The animal cell is 10× larger.

Cell BiologyAQA GCSE Biology (8461)

Cell Structure

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

PreviousNext

Practice progress

6 MCQs

0 of 6 attempted

Correct

Incorrect

Remaining

Practice — Cell Structure

1
Which feature is found in a eukaryotic cell but NOT in a prokaryotic cell?
Answer & explanation
Correct: option C
Ribosomes, cell membrane and cytoplasm are present in both cell types. Only eukaryotic cells have a true (membrane-bound) nucleus.
2
A bacterium has a length of $3\times10^{-6}\,\text{m}$ . What is this length in micrometres?
Answer & explanation
Correct: option B
1 µm = $10^{-6}\,\text{m}$ , so $3\times10^{-6}\,\text{m}$ = 3 µm.
3
Which of these is a plasmid?
Answer & explanation
Correct: option B
A plasmid is a small extra loop of DNA found in prokaryotes. Plasmids can carry useful genes like antibiotic resistance and can be passed between bacteria.
4
A typical animal cell is about 20 µm across. Express this length in metres in standard form.
Answer & explanation
Correct: option B
20 µm = $20\times10^{-6}\,\text{m}$ = $2\times10^{-5}\,\text{m}$ . Option D is the right magnitude but not in standard form (A must be between 1 and 10).
5
Which statement about prokaryotes is correct?
Answer & explanation
Correct: option D
Prokaryotes have no nucleus — DNA sits free in the cytoplasm as a single loop. Their wall is peptidoglycan, not cellulose, and they are typically much smaller (1–10 µm) than animal cells (10–30 µm).
6
An animal cell is $1\times10^{-5}\,\text{m}$ across. A bacterium next to it is $1\times10^{-6}\,\text{m}$ . How many times bigger is the animal cell?
Answer & explanation
Correct: option A
$\dfrac{1\times10^{-5}}{1\times10^{-6}} = 10^{-5-(-6)} = 10^{1} = 10$ . The animal cell is 10× larger.