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GNB502S - GENERAL BIOLOGY 1B - 2ND OPP - JANUARY 2024 |
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nAmlBIA UntVERSITY
OF SCIEnCE AnDTECHnOLOGY
FacultyofHealthN, atural
ResourceasndApplied
Sciences
Schoolof NaturalandApplied
Sciences
Departmentof Biology,
Chemistryand Physics
13JacksonKaujeua Street
Private Bag 13388
Windhoek
NAMIBIA
T: +264 612072012
F: +26461207 9012
E: dbcp@nust.na
W: www.nust.na
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE: GENERAL BIOLOGY lB
LEVEL:5
COURSECODE: GNB502S
DATE: JANUARY 2024
DURATION: 3 HOURS
SESSION: 1
MARKS: 100
SECOND OPPORTUNITY/ SUPPLEMENTARY: EXAMINATION 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 9 pages including this front page
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SECTION A: MULTIPLE CHOICE
(20 MARKS1 1
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 organisms that live in hostile environments that cannot support other forms of
life are members of the domain;
a. Bacteria
b. Archaea
c. Eukarya
d. None of the above
1.2 The adaptive advantage associated with the filamentous nature of fungal mycelia is
primarily related to __ .
a. Their ability to form haustoria and parasitize other organisms
b. Avoiding sexual reproduction until the environment is favourable
c. An extensive surface area allowing invasive growth and absorptive nutrition
d. The increased probability of contact between different mating types
1.3 How do retroviruses, such as HIV, differ from other viruses?
a. They contain DNA that is used as a template to make RNA
b. They contain nucleic acids that code for proteins
c. They have much simpler reproductive cycles than other RNA viruses
d. They can transcribe a DNA copy from an RNA template
1.4 From what type of tissue is endocrine and exocrine glands are formed?
a. Connective
b. Blood
C. Muscle
d. Epithelial
1.5 During winter or periods of drought, which one of the following plant hormones
inhibits growth and seed germination?
a. Ethylene
b. Abscisic acid
c. Gibberellin
d. Auxin
1.6 Evenly thickened cells that function to support mature regions of a flowering
plant are called;
a. Parenchyma
b. Collenchyma
c. Sclerenchyma
d. Guard cells
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1.7 This plant hormone interacts with auxin during the formation of callus in tissue
culture;
a. Florigen
b. Gibberellin
c. Cytokinin
d. Ethylene
1.8 A coelom is a body cavity completely lined with;
a. Epithelium
b. Ectoderm
c. Mesoderm
d. Endoderm
1..9 Which term do we use to describe the region of the body that contains an animal's
tail?
a. Ventral
b. Posterior
c. Anterior
d. Dorsal
1.10 Which row correctly identifies xylem vessel elements and sieve tube elements?
Xylem vessel element Sieve tube element
Companion cell
nucleus cytoplasm nucleus cytoplasm nucleus
cytoplasm
a. y
y
X
X
X
y
b. X
y
y
y
y
X
c. X
X
y
X
y
y
d. X
X
y
y
y
y
Key Y=present X=ABSENT
QUESTION 2: DEFINE THE FOLLOWING TERMS
[2]
Each answer carries one mark
2.1 Fiddle head
2.2 Gram-positive bacteria
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QUESTION 3: FILL IN THE BLANK
[3]
Each answer carries one mark
3.1 The Plasmodium, carried from host to host by a mosquito, causes _____
very serious infectious disease.
__, a
3.2 A ________
DNA.
is an infectious particle made of protein rather than RNA or
3.3 Research on a fungal disease of rice provided the first clues about this plant
hormone ____
_
QUESTION 4: ONE-SENTENCE ANSWERS
[5]
Each answer carries one mark
4.1 What is the function of pili in bacteria?
4.2 Instead of the taxon phylum, what other taxon is used for plants at this level?
4.3 Sclereids and fibers are examples of which plant tissue?
4.4 Give an example of a photosynthetic bacterium.
4.5 Family names for viruses end in what suffix?
SECTION B: SHORT/LONG ANSWER QUESTIONS
Pleaseanswer ALLof the questions in this section.
[45 MARKSJj
QUESTION 5:
Distinguish between the pairs of the following terms.
[4]
Each answer carries two marks.
5.1 Chlorenchyma and aerenchyma
5.2 Plasmogamy and karyogamy
QUESTION 6: SHORT QUESTIONS
[25]
6.1 What are the 3 basic viral shapes?
(3)
6.2 How do Trypanosoma and Paramecium move? Mention the cell wall composition of
Phaeophyta and Bacilfariophyta.
(4)
6.3 Draw a well labelled diagram of neuron. (Label any four parts).
(4)
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6.4 Label each drawing below with the most appropriate term.
(4)
0.
1. --------2.
--------
3. --------
4. ------
6.5 List a hormone that:
(5)
a) Is in nature, gaseous.
b) Is in charge of phototropism.
c) Influences femaleness in cucumber flowers.
d) Is utilized to kill weeds(dicots).
e) Stomata closing.
6.6 In the tabular column form mention the difference between Eubacteria and
Archaebacteria.
(5)
QUESTION 7: LONGER QUESTIONS
[16]
7.1 In the tabular column form compare protostomes and deuterostomes ang give two
example each.
(6)
7.2 In a tabular form distinguish the major divisions in the Plantae.
(10)
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SECTION C: STRUCTURES AND FUNCTIONS
QUESTIONS:
Pleaseanswer ALLof the questions in this section.
8.1 Use the diagram to answer each question of the endocrine system.
B
[ 35 MARKS)
[11]
·o
E---~:-----"";':'"~
. ...;..
i
G --------~-
/
8.1.1 Identify the structure labelled C, name the hormone it produces and describe
their function.
(3)
8.1.2 Identify the structure labelled Hand state which hormone is produced by this
gland?
(2)
8.1.3 Identify the structure labelled F.
(1)
8.1.4 Name the gland that secretes epinephrine and norepinephrine and identify the
alphabet letter in the diagram for the gland that secretes epinephrine.
(2)
8.1.6 Identify the structures labelled I in the diagram, name the two hormones it
produce and describe their functions.
(3)
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8.2 Identify each of the following tissues, provide ONE location, and ONE function of
each.
[9]
Each answer carries three marks
a)
b)
c)
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8.3 Use the following diagram to answer questions.
[6]
Each answer carries one mark
CopynghlCl TOOMcG,.1w,MIACompon,o6. Inc.Pvrmioo-on,oqu.,1.-IdOfroptoduc!IOont d.oplav.
8.3.1
Letters "a", "b", "e", "f', and "g" represent;
a. the lysogenic cycle
b. the process of binary fission
c. the lytic cycle
d. transformation
e. conjugation
8.3.2
The letter "d" represents;
a. bacteriophage
b. capsid
c. viral envelop
d. prophage
e. plasmid
8.3.3
Which part of the diagram is representing the replication or biosynthesis stage?
a. a
b. b
c. e
d. f
e. g
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8.3.4
Letters "b", "c", "d", "e", "f', and "g" represent;
a. the lysogeniccycle
b. the processof binary fission
c. the lytic cycle
d. transformation
e. conjugation
8.3.5 Which part of the diagram represents the recombination stage?
8.3.6 Which part of the diagram represents the assemble stage?
8.4 Use the diagram to answer each question.
[9]
Germination
d
8.4.1 The diagram above illustrates reproduction structure in fungi, label each structure
a-f.
(6)
8.4.2 What phylum does the organism in the diagram belong to? What is the common
name of this organism?
(2)
8.4.3 What type of hyphae do the organism in the diagram have?
(1)
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END OF QUESTION PAPER
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