Wednesday, 17 August 2016


Hereditay acids present in the nucleus are called nucleic acids. They are called so because they were discovered first in the nucleus. But they are present outside the nucleus also that is cytoplasm, mitochondria and plastids. DNA and RNA are the two basic nucleic acids in the living world.

Now read the following questions and answers and suggest some more questions for the aspirants for competitive exams. Please help us rectify the mistakes and improve the content.


1) What are the two nucleic acids?
2) What is meant by DNA?
A) Deoxyribonucleic acid
3) What is meant by RNA?
A) Ribonucleic acid
4) What are the nucleic acid monomers?
A) Nucleotides
5) What are the three components of a nucleotide?
A) Sugar, Phosphate & Nitrogenous base
6) Which sugar molecule is present in DNA?
A) Deoxyribose
7) Which sugar molecule is present in RNA?
A) Ribose
8) What are the polymers of nucleotides?
A) Nucleic acids
9) Who discovered nucleic acids?
A) Friedrich Meischer
10) Who revealed the acidic property of nucleins?
Richard Altmann
11) Who gave the double helical structure of DNA?
A) Watson & Crick
12) Which human cell does not contain nucleic acids?
13) What kind of organisms possess either DNA or RNA only?
A) Viruses
14) Which is the largest individual molecule in the world?
15) How many base pairs does a human DNA contain?
A) 247 million base pairs
16) Which is the single stranded nucleic acids?
17) Which is the double stranded nucleic acids?
18) What is formed from a pentose sugar and nucleobase?
A) Nucleoside
19) What is formed from a nucleoside and a phosphate?
A) Nucleotide
20) What are the common nucleobases in both DNA and RNA?
A) Adenine, Guanine & Cytosine
21) What is the unique nucleobase of DNA?
A) Thymine
22) What is the unique nucleobase of RNA?
A) Uracil
23) What is the backbone of nucleic acids?
A) Sugar -phosphate backbone
24) What are the linkages between sugars and phosphates in nucleic acids? A) Phosphodigester bond
25) Which terminal of the phosphate is attached to the sugar molecule?
A) 3' end
26) Which terminal of the sugar molecule is attached to the phosphate?
A) 5' end
27) What are the linkages between sugars and nucleobases?
A) N-glycosidic linkage
28) What is the pyramidine   ring nitrogen attached to a sugar?
A) N1
29) What is the purine  ring nitrogen attached to a sugar?
A) N9
30) Which end of the sugar is attached to a nitrogen base?
A) 1' Carbon
31) Which nucleic acid contains the largest number of non-stranded modified nucleotides?
32) Where are circular double stranded DNA molecules present?
A) Bacteria,  plasmids,  mitochondria and chloroplasts
33) Where is linear double stranded DNA present?
A) Eukaryotic nucleus
34) What is the direction of two strands in a DNA?
A) Anti-parallel
35) By which process DNA molecules are multiplied?
A) Replication
36) By which process DNA codes are copied into RNA?
A) Transcription
37) What are the most condensed forms of DNA?
A) Chromosomes
38) What kind of organisms have DNA in cytoplasm?
A) Prokaryotes
39) What are the DNA compacting proteins in chromosomes?
A) Histones
40) What are the three types of RNAs?
A) messenger RNA, transfer RNA and ribosomal RNA
41) Which RNA carriers information between DNA and ribosomes?
42) Which is the major component of ribosomes?
43) Which RNA is the carrier of amino acids to the site of ribosomes?
44) What are the purine bases?
A) Adenine,  Guanine
45) What are the pyramidine bases?
A) Cytosine, Thymine & Uracil
46) Which is the hereditary molecules?
47) How many nucleotides are there?
A) 5
48) Who named nucleic acids as "nuclein"?
A) Friedrich Miescher
49) What are the monocyclic nucleobases?
A) Pyramidines
50) What are the bicyclic bases?
A) Purines
51) Who demonstrated bacterial DNA as the carrier of genetic information?
A) Oswald Avery
52) Who established that DNA as species specific?
A) Erwin Chargaff, Alfred Hershey and Martha Chase
53) Where is the programme for cellular activities present?
54) How many covalent bonds are present between Adenine & Thymine / Uracil?
A) 2
55) How many covalent bonds are present between Cytosine & Guanine?
A) 3
56) Which pentose  sugar has four hydroxyl groups?
A) Ribose
57) Which pentose sugar has three hydroxyl groups?
A) Deoxyribose
58) What are the strong acids found in the nucleus of the cells?
A) Nucleic acids
59) Which is the most abundant acid in the nucleus?
59) What is the molecular weight nucleic acid polymers?
A)100,000,000 grams per mole
60) Who isolated nucleic acids from pus cells?
A) Friedrich Miescher
61) What was the name given to nucleic acids by Friedrich Miescher?
A) Nuclein
62) Who coined the term nucleic acid?
A) Altmann
63) Who discovered purines and pyramidines?
A) Fischer
64) Who experimented that DNA is directly involved in inheritance?
A) Avery, Mac Leod and Mc Carty
65) Which is the most abundant acid in ribosomes?

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