CTW 002 INTRODUCTION TO BIOLOGICAL SCIENCES I

MAASAI MARA UNIVERSITY
REGULAR UNIVERSITY EXAMINATIONS
2019/2020 ACADEMIC YEAR
FIRST YEAR FIRST SEMESTER
SCHOOL OF NATURAL RESOURCE AND ANIMAL
SCIENCES
CERTIFICATE IN TOURISM AND WILDLIFE
MANAGEMENT
COURSE CODE: CTW 002
COURSE TITLE: INTRODUCTION TO BIOLOGICAL SCIENCES I.

DATE: 11TH DECEMBER, 2019 TIME: 1430 – 1630HRS
Instructions:
Answer ALL questions in section A and any other THREE in section B
SECTION A (25MARKS) COMPULSORY QUESTION.
a) Define and explain the term evolution (4mks)
b) Briefly describe the five principles of modern cell theory. (5mks)
c) i) Explain using examples the difference between prokaryotic and
eukaryotic cells. (6mks)
ii) Differentiate between unicellular and multicellular organisms.
(4mks)
d) Briefly explain 3 functions of the cell wall (6mks)
SECTION B (45MARKS) ANSWER ANY THREE QUESTIONS.
QUESTION TWO.
a) Describe the difference between a plant cell and an animal cell. (3mks)
b) Distinguish between membrane proteins and glycoproteins. ( 3mks)
c) i) State the 3 layers of a plant cell wall. ( 3mks)
ii) Using illustration describe the structure of an animal cell. (6mks)
QUESTION THREE.
a) Explain the difference between sexual and asexual reproduction
(3mks)
b) Define the following terms as used in cell reproduction. (3mks)
i) Mitosis
ii) Meiosis
c) Briefly describe the 5 phases of eukaryotic cell division. (5mks)
d) State giving specific examples the four types of organic compounds
found in cells of living organisms. ( 4mks)
QUESTION FOUR.
a) Explain the term evolutionary genetics (2mks)
b) Briefly describe the various mechanisms of genome evolution (5mks)
c) Briefly explain the following terms as used in genetics ( 2mks)
i) Mutation.
ii) Allele.
d) Using illustration describe the process by which genes make proteins
(6mks)
QUESTION FIVE
a) Differentiate between a nucleoid and
b) a membrane bound nucleus. (2mks)
c) State and explain the function of seven organelles found in eukaryotic
cell. (7mks)
d) Using illustrations describe the structure of a typical plant cell. (6mks)

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