Biology - Genetics and Evolution
Exam Duration: 45 Mins Total Questions : 30
Hogness box or TATA box has base sequences
- (a)
GATAGA
- (b)
TATA AA
- (c)
GAGAGA
- (d)
GATGAT
Reverse transcriptase is
- (a)
RNA dependent RNA polymerase
- (b)
DNA dependent RNA polymerase
- (c)
DNA dependent DNA polymerase
- (d)
RNA dependent DNA polymerase
E.coil cells with a mutated Z gene of the lac operon connot grow in medium containing only lactose as the source of energy because
- (a)
in the presence of glucose,E.coil cells do not utilise lactose
- (b)
they connot transport lactose from the medium into the cells
- (c)
they lac operon is constitutively active in these cells
- (d)
they cannot synthesise function β-galactosidase
When the two alleles in a heterozygote are fully expressed it is called
- (a)
Blending inheritance
- (b)
Incomplete inheritance
- (c)
Codominance
- (d)
Epistatic inheritance
What is unique about the transcription?
- (a)
Adenosine pairs with uracil instead of thymine
- (b)
Thymine pairs with uracil instead of Adenine
- (c)
Cytosine pairs with uracil instead of Thymine
- (d)
Guanosine pairs with uracil instead of Thymine
The chemical method to prove genetic code is a triplet was developed by
- (a)
Kornberg
- (b)
Nirenberg
- (c)
Khorana
- (d)
Ochoa
Human Genome project was mainly based on the development of techniques and facilities like
i. DNA sequencing
ii. The identification and mapping of genes
iii. The development of computational methods
- (a)
i & ii correct
- (b)
ii & iii correct
- (c)
i&iiicorrect
- (d)
i,ii&iiicorrect
In sickle cell anemia,
- (a)
it is a sex linked recessive disorder
- (b)
It is a dominant gene disorde
- (c)
It is a chromosomal aberration
- (d)
It is a substitution mutation
Human Genome Project was contributed by the countries excep
- (a)
Japan
- (b)
China
- (c)
Germany
- (d)
Brazil
Match the following
Column I | Column II | ||
---|---|---|---|
1 | Lamarckism | A | Galapagos island |
2 | Darwinism | B | Modem synthetic Theory |
3 | Alfred Wallace | C | Philosophique Zoologique |
4 | Huxley | D | Malayan archipelago |
- (a)
(1) A: (2) B: (3) B: (4) D
- (b)
(1) B : (2) A: (3) B: (4) D
- (c)
(1) C: (2) A : (3) D : (4) B
- (d)
(1) D : (2) B : (3) A : (4) C
Which one of the following condition in humans is correctly matched with its chromosomal abnormality/linkage?
- (a)
Klinefelter's syndrome- 44 autosomes + XXV
- (b)
Colour blindness - Y-linked
- (c)
Erythroblastosis foetalis- X-linked
- (d)
Down syndrome- 44 autosomes + XO
Gene and cistron words are sometimes used synonymously because
- (a)
one cistron contains many genes
- (b)
one gene contains many cistrons
- (c)
one gene contains one cistron
- (d)
one gene contains no cistron
Who proved that DNA is basic genetic material?
- (a)
Griffith
- (b)
Watson
- (c)
Boveriand Sutton
- (d)
Hershey and Chase
Which one does not favour Lamarckian concept of inheritance of acquired characters?
- (a)
Lack of pigment in cave dwellers
- (b)
Absence of limbs in snakes
- (c)
Presence of webbed toes in aquatic birds
- (d)
Melanization of peppered moth in industrial areas
Study the characteristics of a population represented in the graphs below.
Which type of selection this population is likely to undergo?
- (a)
Directional selection
- (b)
Stabilising selection
- (c)
Disruptive selection
- (d)
Balancing selection
Select the incorrectly matched pair.
- (a)
Initiation codons - AUG, GUG
- (b)
Stop codons - UAA, UAG, UGA
- (c)
Methionine - AUG
- (d)
Anticodons - mRNA
With regard to mature mRNA in eukaryotes
- (a)
exons and introns do not appear in the mature RNA
- (b)
exons appear but introns do not appear in the mature RNA
- (c)
introns appear but exons do not appear in the mature RNA
- (d)
both exons and introns appear in the mature RNA
In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as
Assertion: Polycistronic mRNA, found in prokaryotes specify a number of polypeptides.
Reason: Monocistronic mRNA, found in eukaryotes, specify only a single polypeptide.
- (a)
If both assertion and reasonare true and reason is the correct explanation of assertion
- (b)
If both assertion and reason are true but reason is not the correct explanation of assertion
- (c)
If assertion is true but reason is false.
- (d)
If both assertion and reason are false.
Number of autosomes present in liver cells of a human female is
- (a)
22 autosomes
- (b)
22 pairs
- (c)
23 autosomes
- (d)
23 pairs
In monohybrid cross, number of pure line plants in F2 will be
- (a)
One
- (b)
Two
- (c)
Three
- (d)
Four
long lived RNA is
- (a)
rRNA
- (b)
mRNA
- (c)
tRNA
- (d)
hnRNA
Complete genome of which non-crop and crop plants has been sequenced?
- (a)
Datura and wheat respectively
- (b)
Arabidopsis and maize respectively
- (c)
Oenothera and oat respectively
- (d)
Arabidopsis and rice respectively
If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group 'B' blood group in 1:2:1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:
- (a)
Complete dominance
- (b)
Codominance
- (c)
Incomplete dominance
- (d)
Partial dominance
In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is
- (a)
0.4
- (b)
0.5
- (c)
0.6
- (d)
0.7
Which of the following evolved into the first amphibians?
- (a)
Lobefins
- (b)
Shrews
- (c)
Salamanders
- (d)
Turtles
Find the odd one related to evolution
- (a)
Veritable hearts
- (b)
Vertebrate brains
- (c)
wings of a butterfly and of birds
- (d)
forelimbs of mammals
According to Hard-Weinberg principle, difference in the values of measured and expected allelic frequencies indicates all of the following, except
- (a)
Changes in the gene pool
- (b)
Disturbance genetic equilibrium
- (c)
Extent of evolutionary change
- (d)
Absence of any kind of evolution
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
- (a)
- (b)
- (c)
- (d)
Removal of RNA polymerase III from nucleoplasm will affect the synthesis of
- (a)
mRNA
- (b)
rRNA
- (c)
tRNA
- (d)
hnRNA
In eukaryotes cell transcription, RNA splicing and RNA capping take place inside the
- (a)
Ribosomes
- (b)
Nucleus
- (c)
Dictyosomes
- (d)
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