Rahul looks at an onion peel cell and a cheek cell under the same microscope…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Rahul looks at an onion peel cell and a cheek cell under the same microscope.
- Which of them has a cell wall?
- What is the outer boundary of the other?
- Name one structure he sees in both.
Need a reminder? The key ideaShow
Eukaryotic cells have a membrane-bound nucleus and membrane-bound organelles; prokaryotic cells have neither. Every cell has a plasma membrane, cytoplasm and ribosomes. Mycoplasma are about 0.3 µm long, bacteria 3 to 5 µm, a red blood cell about 7.0 µm. A cube of side s has surface area to volume 6/s.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The onion cell, a plant cell, has a cell wall.
Step 2. (b) The cheek cell's outer boundary is its plasma membrane.
Step 3. (c) Both have a nucleus, a plasma membrane and cytoplasm.
Answer: (a) the onion cell; (b) the plasma membrane; (c) the nucleus.
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