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Pbiol 011: Basic Biology Question Paper

Pbiol 011: Basic Biology

Course:Certificate Of Pre-University Biology

Institution: Kabarak University question papers

Exam Year:2008

INSTRUCTIONS:
Answer all questions in section A and any two questions in section B

Section A (40 marks)
1. (a) Name two major organelles found in an Eukaryotic cell and state their functions
(2 marks)
(b) Explain how the following processes affect the functioning of living cells.
(i) Diffusion
(ii) Osmosis
(iii) Facilitated diffusion
(iv) Selective permeability (8 marks)
2. What do you understand by the following features of life;
(a) Organization
(b) Growth and development
(c) Adaptation
(d) Homeostasis (10 marks)
3. (a) Explain the factors that make carbon the appropriate constituent of the backbone
of living matter. (5 marks)
(b) What are the structural differences between DNA and RNA. (5 marks)
4. (a) Division of labour among various types of cells in plants is important. Name
the cells that are responsible for the following tasks.
(i) Collection of solar energy
(ii) Transporting water
(iii) Cell division and production of new protoplasm
(iv) Water retention
(v) Certain pigments to attract pollination (5 marks)
(b) Explain briefly how buffers help to maintain body homeostasis. (5 marks)
Section B (30 Marks)
5. (a) What is TURGOR PRESSURE and what is its significance in plant cells? (3 marks)
(b) By use of a diagram explain the general structure of the green leaf. (5 marks)
(c) How is this structure related to photosynthesis and transpiration? (7 marks)
6. (a) In a hyposthetical segment of DNA, the sequence of basis is AGGCTTGATCCG
What would be the sequence of bases in the message RNA strand? (7 marks)
(b) Sexual reproduction produces offspring that are not identical to each other and to
parents. How does meiosis create variability? (8 marks)
7. (a) Explain the terms:
(i) Interior ovary
(ii) Superior ovary
(iii) Actinomorphic flower
(iv) Zygomorphic flower (8 marks)
(b) How is each of these modifications selectively advantageous? (7 marks)

Pbiol 011: Basic Biology Question Paper

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