LIFE SCIENCES GRADE 12 PRACTICAL TASK 1.1 DNA: THE CODE OF LIFE DATE ...
LIFE SCIENCES GRADE 12
PRACTICAL TASK 1.1
DNA: THE CODE OF LIFE
DATE: 15 FEBRUARY 2018
NAME: ___________________________________
TIME: 30 MIN
Total 30
QUESTION 1
Study the following diagrams of different portions of DNA molecules and write the correct term into each of the empty spaces. Numbers 1 to 3 represent labels and numbers 4 to 6 appropriate captions.
1.
2.
4.
nitrogenous base 3.
hydrogen bonds
5.
6.
(6)
Life Sciences Practical Task 1.1
2
Grade 12
FS/February 2018
QUESTION 2
2.1
Below are THREE unzipped strands of DNA molecules ready to be duplicated.
Write the appropriate LETTERS in the spaces provided to build the complementary
strands of DNA X, Y and Z.
X
Y
Z
(3)
2.2
In the DNA "ladders" below, draw the nitrogenous bases from the DNA strands Y
and Z in QUESTION 2.1. Also write down the corresponding numbers of the
nitrogenous bases as indicated by the key. The bases for the first section of DNA
strand X are provided as examples.
KEY: 1 thymine
2 guanine
3 cytosine
4 adenine
X
Y
Z
2
3
1
4
(2)
Life Sciences Practical Task 1.1
3
Grade 12
FS/February 2018
QUESTION 3
The following diagram represents various processes that take place in a cell. The labels A, B and C represent the processes taking place. Write the correct label in each box. .
DNA DNA
A B
mRNA
nuclear membrane
move to cytoplasm
C
anticodon
ribosome (6)
Life Sciences Practical Task 1.1
4
Grade 12
FS/February 2018
QUESTION 4
4.1
Use the decoding wheel to determine the amino acid that corresponds with the
mRNA code given. Read the code from the centre towards the amino acid name
on the edge. Complete the table.
mRNA
AAA GCG GAU CAA
Amino acid
(4)
4.2
Answer the following referring to QUESTION 4.1
4.2.1 Which amino acids have only ONE codon?
________________________________ __________________________ (2)
4.2.2 Which two mRNA codes correspond with histidine?
________________________________ __________________________ (2)
4.2.3 How many different mRNA codes correspond with threonine?
___________
(1)
(5)
Life Sciences Practical Task 1.1
5
Grade 12
FS/February 2018
QUESTION 5
A grocery shop has been robbed. The police arrested two suspects and compared DNA samples from each of them with two hair specimen found at the crime scene. They also took a DNA sample from the owner of the shop in order to exclude him as a suspect.
The results of their investigation are shown below:
Shop owner Suspect 1 Suspect 2 Specimen 1 Specimen 2
5.1 What is the `picture' above called?
_______________________________________
(1)
5.2 How is it possible that the barcodes can be the same for the shop owner and those of specimen 2?
________________________________________________________
________________________________________________________
(2)
5.3 Who committed the crime?
________________________________________________________
(1)
(4)
TOTAL: 30
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