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GNB502S - GENERAL BIOLOGY 1B - JANUARY 2025 |
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nAm I BIA UnlVERS ITV
OF SCIEnCE TECHnOLOGY
FacultyofHealthN, atural
ResourceasndApplied
Sciences
Schoolof Naturaland Applied
Sciences
Departmentof Biology,
Chemistryand Physics
13JacksonKaujeuaStreet T: +264612072012
Private Bag13388
F: +264612079012
Windhoek
E: dbcp@nust.na
NAMIBIA
W: www.nust.na
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BASC
COURSE: GENERAL BIOLOGY lB
DATE: JANUARY 2024
DURATION: 3 HOURS
LEVEL: 5
COURSECODE: GNB502S
SESSION: 1
MARKS: 100
SECOND OPPORTUNITY/ SUPPLEMENTARY: EXAMINATION QUESTION PAPER
EXAMINER:
MODERATOR:
DR JEYA KENNEDY
PROF LAMECH MWAPAGHA
INSTRUCTIONS:
1. Answer all questions on the separate answer sheet.
2. Please write neatly and legibly.
3. Do not use the left side margin of the exam paper. This must be allowed for the
examiner.
4. No books, notes and other additional aids are allowed.
5. Mark all answers clearly with their respective question numbers.
PERMISSIBLE MATERIALS:
1. Non-Programmable Calculator
ATTACHEMENTS
None
This paper consists of 5 pages including this front page
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1SECTION A: MULTIP~E CHOICE
[19 MARKS]
QUESTION 1: MULTIPLE CHOICE QUESTIONS
[10)
Evaluate the statements in each numbered section and select the most appropriate answer
or phrase from the given possibilities. Fill in the appropriate letter next to the number of the
correct statement/phrase on your ANSWERSHEET.
1.1 The main criterion used in Linnaeus's system of classification is an organism's;
{a) evolutionary history
(b) morphology
(c) where they lived
(d) hierarchy
1.2 HIV, the virus that causes AIDS, only infects certain cells within the immune system.
This is because --------
(a) the virus binds to specific receptors that are only present on certain immune
cells
(b) the virus is not very mobile within the body and only comes into contact with a
limited number of immune cells
(c) the virus gets into all cells, but the viral RNA is immediately destroyed in all but a
small number of immune system cells
(d) infection requires the presence of a specific DNA sequence that is only present in
the genome of certain immune system cells
1.3 Bacteria can be identified by the following characteristics EXCEPT;
(a) their shapes
(b) the presence of a nucleus
(c) how they move
(d) the composition of their cell walls
1.4 Which structure in this paramecium contains copies of the cell's genome for
controlling functions?
(a) endoplasm
(b) micronucleus
(c) macronucleus
{d) ectoplasm
1.5 Fungi that consist of a continuous mass containing hundreds or thousands of nuclei
are known as -------
{a) dikaryotic
(b) septate
(c) coenocytic
(d) imperfect fungi
General Biology lB
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1.6 The plant group that possess spores and embryo but lacks vascular tissues and seeds
are;
(a) pteridophyte
(b) rhodophyte
(c) bryophyte
(d) phaeophyte
1.7 Asexual method of reproduction used by some fungi in which a septate hypha dries,
shatters, and releases reproductive cells;
(a) spores
(b) budding
(c) fission
(d) fragmentation
1.8 Which of these does not pertain to a protostome?
(a) spiral cleavage
(b) blastopore is associated with the anus
(c) coelom, splitting of mesoderm
(d) annelids, arthropods and molluscs
1.9 Ligaments connect bones together and withstand a lot of stress. What type of
connective tissue should you expect ligaments to contain?
(a) areolar tissue
(b) adipose tissue
(c) dense regular connective tissue
(d)dense irregular connective tissue
1.10 A flexible, rubbery protein in connective tissue is called-----~
more fibrous, less flexible glycoprotein is called ______
_
(a) adipose; cartilage
(b) endocrine; exocrine
(c) sweat; hormones
(d) elastin; collagen
whereas a
QUESTION 2: DISTINGUISH BETWEEN THE PAIRS OF THE FOLLOWING TERMS
[4]
Each answer carries two marks.
2.1 Transformation and transduction
2.2 Archenteron and blastopore
General Biology 1B
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QUESTION 3: ONE-SENTENCE ANSWERS
[5]
Each answer carries one mark
3.1 Define what it means to be an absorptive heterotrophic.
3.2 What suffix do genus names for viruses end with?
3.3 What type of cleavage is present in protostomes?
3.4 Define the term bacteriophage.
3.5 What type of symmetry do Echinodermata have?
QUESTION 4: SHORT QUESTIONS
The number of marks is given in brackets{} at the end of each question.
[46 MARKS]
[19]
4.1 Name the algae which are multicellular.
(1.5)
4.2 Name the subdivisions of bryophytes.
(1.5)
4.3 A wart is caused by a virus that may lie dormant for years before any symptoms
appear. Does this resemble a lytic or lysogenic infection? Explain.
(2)
4.4 What are two roles prokaryotes play in the cycling of elements in an ecosystem? (2)
4.5 Explain the relationship between shingles and chickenpox.
(2)
4.6 What are the 6 major types of connective tissue in vertebrates?
(3)
4.7 Write a short note on retroviruses and give one example.
(3)
4.8 Identify the phyla that have the following characteristics: (a) radial symmetry (b)
acoelomate (c) psedocoelomate (d) coelom
(4)
QUESTION 5: LONGER QUESTIONS
[27]
5.1 In a tabular form differentiates between parenchyma and collenchyma tissues.
Draw a well labelled diagram.
(5)
5.2 What are the similarities and differences between slime molds and fungi?
(6)
5.3 Describe the principal modes by which prokaryotes carry out nutrition and energy
capture and compare their requirements for oxygen.
(6)
5.4 Briefly describe the structure of unicellular Euglena with a diagram.
(10)
General Biology 1B
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QUESTION 6:
Use the diagram to answer the questions below.
[7]
____
c
?'1
IJ-:----+1--1--t+t---e
6.1 The figure above shows a diagram of a tissue, is it a simple or complex permanent
tissue and is it a living, dead or both?
(1)
6.2 Identify the structures labelled b, c, d and e in the diagram.
(4)
6.3 Mention the four components of the above diagram.
(2)
QUESTION7: ESSAYQUESTIONS
[28)
7.1 Draw a phylogenetic tree with a flow chart diagram that represents our current
understanding of the evolutionary relationships of plant kingdom ancestors. Label
each branch point of the phylogeny with at least one derived character unique to the
clade descended from the common ancestor represented by the branch point. (13)
7.2 Describe the major divisions of fungi and the primary characteristics that distinguish
them with example.
(15)
General Biology 1B
ENDOF EXAMINATION QUESTIONPAPER
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2nd Opportunity/Supplementary January 2025