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GNB502S - GENERAL BIOLOGY 1B - 1ST OPP - NOVEMBER 2023 |
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nAmlBIA UnlVERSITY
OF SCIEnCE AnDTECHnOLOGY
FacultyofHealthN, atural
ResourceasndApplied
Sciences
Schoolof NaturalandApplied
Sciences
Departmentof Biology,
ChemistryandPhysics
13JacksonKaujeua Street
Private Bag 13388
Windhoek
NAMIBIA
T: •264 612072012
F: +264612079012
E: dbcp@nust.na
W: www.nust.na
QUALIFICATION : BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE: GENERAL BIOLOGY 1B
DATE: NOVEMBER 2023
DURATION: 3 HOURS
LEVEL:5
COURSECODE: GNBS02S
SESSION: 1
MARKS: 100
FIRST OPPORTUNITY: QUESTION PAPER
EXAMINER:
MODERATOR:
DR JEYA KENNEDY
DR 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 8 pages including this front page
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SECTIONA: MULTIPLECHOICE/ FILLIN THE BLANK
[ 20 MARKS]
QUESTION 1: MULTIPLECHOICEQUESTIONS
[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 Which of the following is the correct scientific name of an organism?
a. Canis lupis
b. Homo Sapiens
c. Grant's gazelle
d. E. Coli
1.2 Which of the following cells or structures are associated with asexual reproduction in
fungi?
a. Ascospores
b. Basidiospores
C. Zygosporangia
d. Conidiophores
1.3 The disadvantage of using common names for species is that:
a. The names may change
b. One name does not apply universally
c. One species may have several common names
d. All the above
1.4 Circular RNA molecules that function like a virus in plants are termed __ .
a. Retrovirus
b. Viroid
c. Prion
d. None of the answers is correct
1.5 Facultative anaerobes;
a. Require a constant supply of oxygen
b. Are killed in an oxygenated environment
c. Do not always need oxygen
d. Are photosynthetic but do not give off oxygen
1.6 Deuterostomes are characterized by;
a. Spiral cleavage
b. Determinate cleavage
c. An acoelomate body plan
d. Radial cleavage
GENERALBIOLOGY18 (GNB502S)
1st Opportunity November 2023
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1.7 Match each item in column 1 with one in column II and select your answer from the
codes given below.
Column 1
Column II
1
Diatoms
a Protein rich layer of pellicle
2
Dinoflagellates
b Cell wall embedded with silica
3
Euglenoids
C Spores with true walls
4
Slime moulds
d Cellulose plates in the cell wall
Codes
1
2
3
4
a.
b
a
C
d
b.
b
d
a
C
c.
b
C
a
d
d.
b
a
d
C
1.8 Which of the following is a function of epithelium?
a. Protection
b. Secretion
c. Sensory surface
d. All of the above
1.9 Conifers, cycads and ginkgoes are collectively called ____
_
a. Gymnosperms
b. Angiosperms
c. Dicots
d. Seedless vascular plants
1.10 Which row correctly identifies xylem vessel elements and sieve tube elements?
Xylem vessel element
Sieve tube element
Nucleus
a.
X
b.
X
C.
X
d.
X
Cytoplasm
X
y
X
X
End wall
X
y
X
y
Nucleus
X
X
y
y
Cytoplasm
y
y
X
y
End wall
y
y
X
X
Key Y=present X=ABSENT
QUESTION 2: DEFINE THE FOLLOWING TERMS
[2]
Each answer carries one mark
2.1 Cephalization
2.2 Epithelial tissue
GENERALBIOLOGY1B (GNB502S)
1st Opportunity November 2023
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QUESTION 3: FILL IN THE BLANK
[8]
Each answer carries one mark
3.1 Scientists who study viruses are known as ____
_
3.2 The two simple tissues that are specialized for supporting plants are ____
_
and ------
3.3 Chickenpox and _____
are caused by the same virus.
3.4 The flagellate, Trypanosomai, carried from host to host by an insect, causes
____
_, a very serious infectious disease.
3.5 Plant species are subdivided into -----~
into ___ _
while bacteria are subdivided
3.6 A virus that transcribes DNA from an RNA template is called a(n) ______
_
SECTION B: SHORT/LONG ANSWER QUESTIONS
QUESTION 4: SHORT QUESTIONS
[35 MARKS]
[15)
4.1 To which other domain is the domain Eukarya (containing humans) most closely
related?
(1)
4.2 Name and sketch the 3 variations of spiral shaped bacteria.
(3)
4.3 Show the diagrammatic representation of location of meristematic tissue in plant
body and label its parts.
(3)
4.4 Mention the type of food storage seen in Chrysophyta, Euglenophyta and the types
of pigments found in Chlorophyta, Phaeophyta.
(4)
4.5 Draw a well labelled diagram of cardiac muscle found in the human body and label it,
write two differences striated and smooth muscles.
(4)
QUESTION 5: LONGER QUESTIONS
[20)
5.1 What is Gram stain? When examining stained cells, what is the difference in
appearance between Gram-positive and Gram-negative cells? What are the medical
implications of Gram-negative cells with respect to antibiotics like penicillin?
(7)
5.2 In a tabular form compare for each of the three groups of perfect fungi (Zygomycota,
Ascomycota, and Basidiomycota}, common name, septate or coenocytic, type of
reproduction (asexual or sexual spores or both), asexual reproduction spores name,
sexual fruiting body names and provide an example.
(13)
GENERALBIOLOGY 18 (GNB502S}
pt Opportunity November 2023
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SECTION C: STRUCTURESAND FUNCTIONS
[ 45 MARKS)
QUESTION 6:
6.1 Refer to the illustration below answer all the following questions, the structure
grouped according to the types of body cavity.
(15]
d
e
h
f
g
a
b
k
C
6.1.1 Observe the given figures, identify the types of body cavity from a to c.
(3)
6.1.2 Identify which diagram, the animal that lacks an enclosed body cavity and give one
example.
(2)
6.1.3 In figure c above which germ layer that lines the digestive tract and mention the
alphabet letter.
(2)
6.1.4 Which in the diagram is mesoderm? (A} d & I (B} f & j (C}d & k (D} e & i (E} I & e? (1)
6.1.5 Identify the phyla that belong to the structure c.
(1)
6.1.6 Study diagram band answer the following questions. (i) identify the structure h,
mention its name and what is its function. (ii) Give 2 phylum names which belong to
this structure.
(4)
6.1.7 Which germ layer forms muscles in the above diagram and mention the alphabet
letter from the above figure.
(1)
6.1.8 What is the function of the germ layer d.
(1)
GENERALBIOLOGY18 (GNB502S)
pt Opportunity November 2023
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6.2 The diagram below is a phylogenetic diagram of plants. Use the diagram to answer
the questions below.
(10)
e
6.2.1 Under the broad classification plant, a and c belongs to which classes and why? (3)
6.2.2 Which stage of plant life cycle is dominant in plant a and c?
(1)
6.2.3 What covers the outside of a plant d to prevent water loss?
(1)
6.2.4 A special name is given to the leaves of the plant b, what name is it?
(1)
6.2.5 To which division plant band d belong to?
(2)
6.2.6 What phase of the plant d life cycle is dominant?
(1)
6.2.7 How does plant b reproduce?
(1)
GENERALBIOLOGY1B (GNB502S)
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6.3 Use the diagram to answer each question.
(4)
A
B
6.3.1 Can you explain the use of plant hormone in the diagram B?
(2)
6.3.2 Which plant hormone is dominant in the diagram C?
(1)
6.3.4 Which plant hormone is found in the diagram A of a dormant seed?
(1}
6.4 The diagrams below represent five steps in the lytic cycle of a bacteriophage.
The order of the steps has been scrambled. Arrange the steps in their correct
order by writing the letter of each step, and briefly describe what is happening
in each step.
(5)
,,
. .",,.
'I•
\\
.
•• Ir
. .,,,,II
~:) I,·
A
B
C
D
:..t-,;
~\\-;. ~.
\\J~'
\\IJ~ '
E
GENERALBIOLOGY1B (GNB502S}
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6.5 Use the diagram to answer each question of the endocrine system.
[11)
------0
0
6.5.1
What is considered the "master gland" of the endocrine system? Why is it
considered the master gland, and where it is located in the above figure (mention
the alphabet letter}?
(3)
6.5.2 Name the hormone secreted by the thyroid, where it is located in the above figure
and state its functions.
(4)
6.5.3
Which organ secretes a hormone when blood sugar rises in our body? Name the
hormone and name one enzyme released by this organ. Identify the letter in the
above figure where it is located.
(3)
6.5.4 Which gland produces epinephrine and identify the letter in the above figure? (1)
END OF QUESTION PAPER
GENERALBIOLOGY 18 (GNB502S}
1st Opportunity November 2023
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