Biology 9700 · AS & A Level · Testing for biological molecules
Testing for biological molecules — practice question
During the earliest phase of an animal’s development, the zygote and its daughter cells divide by mitosis to produce an embryo made up of genetically identical cells. Fig.1 shows several cells at different stages of the cell cycle in an embryo of whitefish, Coregonus artedi.
(a(i))[2]
Name the mitotic stage in cell A and in cell B, shown in Fig.1.
(a(ii))[3]
Fig.1 shows microtubules in the dividing cells. Describe the role of microtubules in mitosis.
(a(iii))[3]
State what occurs in cell C, shown in Fig. 4.1, until two new cells are produced.
(b)[3]
The cells formed in the developing whitefish are genetically identical. Identify and explain two events that occur during the cell cycle that result in daughter cells being genetically identical.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A = metaphase stage” …