Thursday, March 15, 2012


1 The pair in one of the sets show reversal processes

Ans:Ammonification – Nitrogen assimilation
2 Process in which Ammonia is formed are
I. Industrial Physical Nitrogen fixation
II. Ammonification
III. Biological nitrogen fixation
IV. Volcanic eruptions

3 Microbes involved in mineralization process of Nitrogen cycle are

Ans:Fungi and Bacteria
4 Study the following table and choose the correct combination

Ans:I and III
5 Study the following and choose the correct match

Ans:A - III, B - V, C - IV, D - I
6 Study the following table and choose the correct combination

Ans:II, IV
7 [A]: AUG is the first codon present at the beginning of mRNA molecule of all organisms.
[R]: Chain initiating codon is present at the 5' end of coding region of mRNA.

Ans: A is false but R is true
8 Choose the correct statement

Ans:The sequence of amino acids present in two different types of proteins is not same
9 Minimum number of codons that indicate the 20 amino acids is

10 The following set of codons do not indicate the amino acid serine.

Ans:III and IV
11 The following codon can code for 2 different amino acids at different places.

12 This is not a feature of Genetic code

Ans:It shows degeneracy with respect to all amino acids
13 If the coding region of a mRNA has the codons AUG, AGU, UUU, GGG, UCA, UAA, the amino acids present in resultant polypeptide chain are

Ans:Methionine, Serine, Phenyl Alanine, Glycine, Serine
14 Identify the legitimate sequence of codons in the coding region of mRNA.

15 The following codon does not indicate any amino acid.

16 This is metabolically unstable molecule

17 The nucleotide ‘G’ present on anti-sense strand is transcribed as

18 Pre messenger RNA is called as

Ans:hn RNA
19 [A]: Transcription is initiated at promoter region
[R]: In a mRNA, the nitrogen bases at the 5' end are complementary to nitrogen bases present at 5' end of template strand of DNA.

Ans:A is true but R is false
20 Transcription is

Ans:DNA dependent RNA synthesis
21 [A]: Genetic code is non-ambiguous
[R]: GUG always codes for amino acid valine

Ans:A is true but R is false
22 The factor that is responsible for movement of Ribosome on mRNA during translation is

23 The number of ATP used for the transfer of 2 electrons from Ferridoxin to N2 during biological nitrogen fixation is

24 [A]: Bossingault was first to notice increase in soil fertility by leguminous crops
[R]: He discovered the presence of Rhizobia in the root nodules of Legumes.

Ans:A is false but R is true
25 The following can fix N2 into NH3 either symbiotically or non-symbiotically.
I. Frankia
II. Nostoc
III. Rhizobium
IV. Anabaena

Ans:II and IV
26 This is not Diazotroph

Ans:Rhizobium in the soil
27 In Azotobacter, the source of electrons for Nitrogen fixation is Glycolytic Pyruvic acid and ATP is of aerobic respiration, how many molecules of Glucose must be oxidized for the formation of 10 NH3.

28 This more efficient in fixing atmospheric Nitrogen

Ans:Rhizobium of root nodule
29 The following is byproduct during biological nitrogen fixation

30 Heterocysts are present in

31 Match the following with respect to Nitrogen fixation

Ans:A - IV, B -III, C -II, D -I
32 Study the following table and choose the correct combination

Ans:I and II
33 [A]: Nitrogenase is Hexameric enzyme.
[R]: It has 6 types of active sites.

Ans:A is true but R is false
34 Arrange the involvement of the following during Nodulation in Legumes
I. Lectins
II. Cellulase
III. Flavanoids
IV. Curling factor

Ans:III, I, IV, II
35 Alnus is inhabited by

36 Arrange the following in correct sequence during nodulation in Legumes.
I. Bacteroid formation
II. Shepherds crook
III. Infection thread formation
IV. Arrest of root hair growth

Ans:II, IV, III, I
37 These group of plants can be symbiotic in Fungi, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms

Ans:Blue green algae
38 Nitrogenase has the micronutients

Ans:Fe, Mo
39 Host structure involved in bringing the Rhizobia upto inner cortical cell

Ans:Plasma membrane
40 The isotope used to understand the mechanism of diazotrophy is


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