Chromosome and DNA Chapter Biology MCQs


FSC Biology MCQs

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[question]
Which is incorrect?
A. Chromosomes 1st observed by walther Fleming B. Chromosomal theory of inheritance 1st formulated by Walter Sutton
C. 1st evidence of hereditary nature of DNA provided by Friedrich Meischer D. Sex chromosomes discovered by Thomas Hunt Morgan
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[explanation]c[/explanation]
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[question]
Histones have abundance of amino acids
A. Valine and lysine B. Arginine and lysine
C. Valine and arginine D. Histidione and threonine
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[explanation]b[/explanation]
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[question]
A tortion of chromatin that is condensed only during cell division is
A. Euchromatin B. Heterochromatin
C. Biochromatin D. Nucleochromatin
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[explanation]A[/explanation]
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[question]
DNA has a helical shape with the diameter of
A. 3 nm B. 4 nm
C. 2 nm D. 5 nm
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[explanation]c[/explanation]
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[question]
In semi-conservative replication
A. Sequence of original duplex is conserved after one round of replication B. Gererate DNA copies of entirely new molecules
C. Parental DNA become completely dispersed D. Each strand of daughter molecules will be a mixture of old and new
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[explanation]A[/explanation]
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[question]
Rate of DNA replication by DNA polymerase is
A. 2000 nucleotides / sec B. 1000 nucleotides / sec
C. 150 nucleotides / sec D. 1050 nucleotides / sec
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[explanation]b[/explanation]
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[question]
Which statement is correct?
A. Leading strand elongates away from the replication fork B. Lagging strand elongates towards the replication fork
C. Lagging strand is constructed discontinuously. D. Both a and b
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[explanation]c[/explanation]
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[question]
The length of okazaki fragments in eukayotes is
A. 150–250 nucleotides long B. 200-300 nucleotides
C. 1000-2000 nucleotdes D. 100-200 nucleotides
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[explanation]d[/explanation]
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[question]
Central dogma is
A. Transfer of information from DNA to mRNA B. Basic mechanism of reading and expressing genes
C. Transfer of information from RNA to proteins D. Synthesis of all three types of RNA
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[explanation]b[/explanation]
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[question]
In eukaryotes newly synthesized mRNA
A. Travels a large distance from nucleus to cytoplasm B. Is directly released into the cytoplasm
C. Contains a cap and tail D. Both a and c
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[explanation]d[/explanation]
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