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Pbiol 011: Basic Biology I Question Paper

Pbiol 011: Basic Biology I

Course:Certificate Of Pre-University Biology

Institution: Kabarak University question papers

Exam Year:2011

INSTRUCTIONS:
· Answer ALL Questions in Section A and Any TWO question from Section B.

SECTION A (50 MARKS)
1. (a) Define the following terms:
a. Triglyceride
b. Dominant allele
c. Ground tissue system
d. Golgi complex
e. Homologous chromosome.
(b) In plants there is division of labour among various types of cells. What cells are
responsible for the following functions?
a. Collection of solar energy
b. Water transport
c. Cell division and production of new protoplasm
d. Water retention
e. Attraction of pollinators.
2. (a) What are the structural differences between DNA and RNA?
(b) What three factors make carbon the appropriate constituent of the backbone of
living matter?
(c) How does transpiration assist in the transport of water and mineral ions in plants?
3. (a) What are plastids?
(b) Which plastids store: sytarch, oil, flower pigments
(c) Draw atypical plan cell and label: cell wall, nucleus, plasma membrane,
mitochondrium, vacuole.
4. (a) What do you understand by the principles of segregation?
(b) In families of four children what is probability that there will be
i) 3 boys and one girl
ii) 2 girls and 2 boys.
(use binomial expansion)
SECTION B (30 MARKS)
5. In rabbits black colour is due to a dominant allele B and brown colour is due to its recessive
allele b. Short hair is due to the dominant allele S and long hair is due to its recessive
allele s. in a cross between a homozygous black long haired rabbit and a brown homozygous
short haired one, what genotype would the F1 show? If two F1s were crossed, show the
parental genotypes, the gametes, the F2 generation by use of a punnet square and the four
phenotypic classes.
light
6. 6CO2 + 12H2O C612O6 + 6H2O + 6O2
chlorophyll
The above equation shows the general chemical reaction for photosynthesis.
Describe in details how a green leaf is adapted to carry out this function.
7. Describe the manner in which carbon is taken up by a leaf and explain how this is
related to water loss, citing the mechanism that regulates opening and closing of
stomata.

Pbiol 011: Basic Biology I Question Paper

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