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Zool 110: Cell Biology &Amp; Genetics Question Paper

Zool 110: Cell Biology &Amp; Genetics

Course:Pure & Applied Sciences

Institution: Kenya Methodist University question papers

Exam Year:2012

KENYA METHODIST UNIVERSITY
END OF 3''RD ''TRIMESTER 2012 (DAY) EXAMINATIONS
FACULTY : SCIENCE & TECHNOLOGY
DEPARTMENT : PURE & APPLIED SCIENCES
UNIT CODE : ZOOL 110
UNIT TITLE : CELL BIOLOGY & GENETICS
TIME : 2 HOURS

Instructions: Answer ALL Questions in Section A and any TWO Questions in Section B.
SECTION A
Question One
Explain how the surface area – volume ration controls metabolic rates of cells.
(4 Marks)
Explain what happens to a freshwater unicellular organism if its contractile vacuole stopped functioning.
(3 Marks)
Describe the THREE main phases of interphase of the eukaryotic cell cycle.

(3 Marks)
Question Two
State FOUR functions of the lysosomes.
(4 Marks)
Describe prokaryotic cell division.
(3 Marks)
Illustrate a dihybrid cross and give the expected genotypes and phenotypes.
(3 Marks)
Question Three
In human beings, pointed eyebrows are dominant over smooth eyebrows. Mary’s father has pointed eyebrows, but she and her mother have pointed and smooth eyebrows respectively work out her father’s genotype.
(4 Marks)

(b) Giving examples, distinguish between incomplete dominance and co-dominance. (3 Marks)

(c) Explain the cause of down syndrome and give its main characteristics.
(3 Marks)
SECTION B
Question Four
(a) Describe the specialized features of some prokaryotic cells giving their functions. (14 Marks)

(b) Explain what happens to the chromosomes and chromatids during the following stages of meiosis. (6 Marks)
Prophase 1
Metaphase 1
Prophase II
Question Five
Write short notes on endocytosis.
(8 Marks)
Compare and contrast meiosis and mitosis.
(12 Mark)
Question Six
Explain the role of the following in protein synthesis. (12 Marks)
Nucleus
Ribosomes
Golgi Apparatus.
Explain FOUR functions of the membrane proteins.
(8 Marks)

Zool 110: Cell Biology &Amp; Genetics Question Paper

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