Biology 9700 · AS & A Level · Testing for biological molecules
Testing for biological molecules — practice question
The cells in Fig. 1.1 come from one organism and have the same appearance. The cells in Fig. 1.1(a) were formed by mitosis, while the cells in Fig. 1.1(b) were formed by meiosis.
(a(i))[2]
Complete the table to show two differences between cells formed by mitosis and cells formed by meiosis.
(a(ii))[2]
Explain why this organism makes cells by meiosis.
(b(i))[2]
Calculate the actual width of the cell in Fig. 1.2 at X-Y. Show all working and state your answer to the nearest micrometre ($\mu\text{m}$).
(b(ii))[2]
The cancer cell in Fig. 1.2 contains more mitochondria and rough endoplasmic reticulum (RER) than the non-cancerous cell it came from. Suggest why this is the case.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Mitosis forms diploid cells with two chromosome sets ($2n$); meiosis forms haploid cells with one chromosome set ($n$)” …