1. Diagrams A, B and C show cells from different parts of the human body, all drawn to the same
scale.
A
B
С
Key
- Mitochondrion
Ribosome
(a)
Which cell, A, B or C, appears to be best adapted to increase diffusion into or
out of the cell?
Give one reason for your choice.

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls