Ordinary Level
SEC Sample Paper OL
3.
Select the correct term from the following list to match each of the terms in column A and write
it in column B.
liver, variation, lipid, haploid, sap
A
B
Cell membrane
Vacuole
Mutation
Organ
Gamete
2004 OL
3.
Indicate whether the following are true (T) or false (F) by drawing a circle around T or F.
Mitosis is the division of a nucleus into two identical nuclei
T
F
A sperm contains the haploid number of chromosomes
T
F
Organisms of the same species can usually produce fertile offspring
T
F
Aerobic respiration is the release of energy in the absence of oxygen
T
F
T
F
Chromosomes are made of DNA and lipid
T
F
RNA is not found in ribosomes
T
F
Immobilised enzymes can act as catalysts
2007 OL
4.
Complete the following sentences by adding the missing word or symbols or number.
(a)
Genetics is the study of
………………………………………………………………………………
(b)
In a woman the sex chromosomes are XX; in a man they are
………………………………………
(c)
If the diploid number in a cell is 46, the haploid number is
…………………………………………
(d)
In order to make proteins, DNA is first transcribed as messenger
………………………………….
(e)
A change in the genetic material of an organism is called a
…………….…….…………………….
2008 OL
5.
The diagram represents a part of a DNA molecule. A and C represent nitrogenous bases.
Complete the following in relation to DNA.
(a)
Name the nitrogenous bases whose first letters are A and C.
(b)
The structure labelled X is called a
(c)
Where in the cell would you expect to find most DNA?
(d)
DNA contains the instructions needed to make protein.
These instructions are called the _________________ code.
2009 OL
3.
Natural selection is an important aspect of the study of evolution. Answer the following parts in
relation to
evolution and natural selection.
(a)
What is meant by natural selection?
(b)
Name a scientist who is associated with the Theory of Natural Selection.
(c)
Variation is essential for natural selection. Mutation can give rise to variation.
Give two causes of mutation.
(d)
Give one source of evidence for the occurrence of evolution
2010 OL
4.
Choose each term from the following list and place it in Column A to match a description from
Column B. The first one has been completed as an example.
Dominant
Column A
Genetics
Gamete
Gene
Mutation
Genetics
Genotype
Column B
The study of biological inheritance
(i)
The genetic make up of an individual
(ii)
A sex cell
(iii)
A change in the structure of DNA
(iv)
A part of DNA with information to make one protein
(v)
The allele expressed in the heterozygous condition
2012 OL
3.
Indicate whether each of the following statements is true (T) or false (F) by drawing a circle
around T or F ineach case.
(a)
The base Uracil is found in DNA.
T
F
20120OL
6.
In pea plants the allele for tall (T) is dominant over the allele for dwarf (t).
A heterozygous tall plant is crossed with a dwarf plant.
Complete the blank spaces below.
Genotypes of parents
(Tt)
(a) Possible gametes
(b) Genotypes of offspring
(c) Phenotypes of offspring
-
( )
(
)
(
(
-----------
)
×
(tt)
×
(
)
)
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