Cytology questions | form five Biology

1. Give  labeled drawings to show the appearence of an anima cell at each of the following stages of division

1. ) Pachytene
2. ) Diplotene
3. ) Metaphase 1 of meiosis
4. ) Metaphase of mitosis

2. Briefly describe the events taking place at each of the stages in (a) above.

Below is a diagram of an acinar cell of a pancreas involved in the synthesis and secretion of an inactive enzyme (zymogen)

1. Name parts labeled A,B,C,D,E,F,G and H.
2. Briefly explain how organelles A, C,D and H are involved in the synthesis and secretion of the inactive enzyme.

1. Draw the structure of animal cell as seen under electron microscope
2. i. Name a double membrane organelle found inplant cell only

2. How is the organelle adapted to its role?

1. Distinguish between structural and functional proteins.
2. Draw a large diagram of a typical plant cell as seen under the electron microscope. Indicate using the letters below, the cellular structures concerned with:

1. Cellular respiration
2. Protein synthesis
3. Photosynthesis
4. Transport and modification of cellular proteins and lipids
5. Transport and provision of surface area for lipids and steroid synthesis
6. Transport of cellular proteins
7. Control exchange of materials between cells
8. Control cell division.

100. What are the possible roles of the cell wall?

1. Describe the features of cell membrane
2. Assess the suitability of the structure of a mitochondrion to its functions. Give five points.

Diagram A and B represent two cell organelles as seen under electronic  microscope.

1. (i) Identify the two cell organelles

          (ii) Name the structures numbered 1-8

2. Without using diagrams, outline the process taking place in the structures labeled 3 and 8
3. Explain briefly how organelles 1 and 2 are adapted to the functions they perform.

1. With the aid of diagrams describe the structure and functions of the following cell organelles

         i) Golgi apparatus

         ii) Chloroplast

2. The table below shows the relative amount of DNA in a cell of organism X measured during mitosis and meosis

1. Account for the differences in DNA content among the different phases.
2. What would be the probable amount of DNA content in late telophase I and prophase II of meiosis? Explain.

1. What is meiosis?
2. Outline the events occuring in the 1^st meiotic prophase and 1^st meiotic metaphase . Illustrate your account with diagrams based on two pairs of chromosomes only.

The photomicrographs below; A, B, C and D swho different stages of animal cell undergoing division.

1. Giving reason name the type of cell division shown in the microphotographs.
2. (i) Identify the stages of cell division shown in photograph A, B, C and D

          (ii) Describe the events taking place at each of the four stages in A, B, C and D

100. (i)Explain the importance of the type of cell division mentioned in (a) above.

          (ii)Where and when in a human being are likely to encounter this type of cell division?

500. Basing on only 3 pairs of chromosomes , draw large and well labelled diagram to represent stage B and D.

1. Point out two similarities and two differences between an animal cell and a plant cell
2. Outline the functions of a nucleus.