Chromosome and DNA Mcqs

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.

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1.
Which is incorrect?

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.
Chromosome is made of

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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3.
Chromosomes are composed of

40% protein and 60% DNA

50% protein and 50% DNA

70% protein and 30% DNA

60% protein and 40% DNA

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4.
A typical human chromosome contains _________ nucleotides in its DNA

240 million

140 million

150 million

160 million

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5.
Histones have abundance of amino acids

Valine and lysine

Arginine and lysine

Valine and arginine

Histidione and threonine

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6.
A tortion of chromatin that is condensed only during cell division is

Euchromatin

Heterochromatin

Biochromatin

Nucleochromatin

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7.
Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called

Mutation

Transuction

Replication

Variation

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9.
DNA contains

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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10.
In DNA

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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12.
In semi-conservative replication

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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13.
The true E.Coli replicating enzyme is

DNA polymerase I

DNA polymerase II

DNA polymerase III

All of these

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14.
Rate of DNA replication by DNA polymerase is

2000 nucleotides / sec

1000 nucleotides / sec

150 nucleotides / sec

1050 nucleotides / sec

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15.
Which statement is correct?

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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