This Set of Multiple choice questions and answers focuses on study of Chromosome and DNA in Biology. These questions are chosen from a collection of most authoritative and best reference books on Biology. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Medicine industry job interviews. One should practice our Mcqs to assimilate knowledge on Chromosome and DNA comprehensively.
Chromosomes 1st observed by walther Fleming
Chromosomal theory of inheritance 1st formulated by Walter Sutton
1st evidence of hereditary nature of DNA provided by Friedrich Meischer
Sex chromosomes discovered by Thomas Hunt Morgan
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2 chromatids +1 centromere +secondary constriction
1 chromated + 1 centromere + primary constriction
2 chromatids + 1 centromere + primary constriction
2 chromatids + 2 centromere + secondary constriction
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40% protein and 60% DNA
50% protein and 50% DNA
70% protein and 30% DNA
60% protein and 40% DNA
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240 million
140 million
150 million
160 million
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Valine and lysine
Arginine and lysine
Valine and arginine
Histidione and threonine
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Euchromatin
Heterochromatin
Biochromatin
Nucleochromatin
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Mutation
Transuction
Replication
Variation
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P.A.Levene
Frederick Griffith
Friedrich Miescher
Rosalind Franklin
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Purines (A and G) pyrimidines (U and (c)
Purines (T and (c) pyrimidines (A and G)
Purines (A and (c) pyrimidines (U and G)
Purines (A and G) pyrimidines (T and (c)
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A forms two bonds with T
G forms three bonds with C
A forms three bonds with T
Both a and b
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3 nm
4 nm
2 nm
5 nm
Sequence of original duplex is conserved after one round of replication
Gererate DNA copies of entirely new molecules
Parental DNA become completely dispersed
Each strand of daughter molecules will be a mixture of old and new
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DNA polymerase I
DNA polymerase II
DNA polymerase III
All of these
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2000 nucleotides / sec
1000 nucleotides / sec
150 nucleotides / sec
1050 nucleotides / sec
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Leading strand elongates away from the replication fork
Lagging strand elongates towards the replication fork
Lagging strand is constructed discontinuously.
Both a and b
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