This practice test includes 25 important multiple-choice questions (MCQs) from the chapter – Molecular basis of inheritance (Class 12th Biology). attempt this test and revise this chapter to be fully prepared for the upcoming exam. these questions will be helpful for upcoming NEET, Aiims, and other entrance level exams.
Molecular basis of inheritance (class 12th Biology) Revision Test | MCQs For NEET
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Total: 25 Questions
Questions
Q1.
Which of the following statements is the most appropriate for sickle cell anaemia ?
Q2.
The first genetic material could be
📘 Explanation:
The first genetic material could be RNA
Q3.
The human chromosome with the highest and least number of genes in them are respectively
📘 Explanation:
chromosome 1 and Y is the correct answer.
Q4.
Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?
📘 Explanation:
Maurice Wilkins contributed in development of double helix model
Q5.
Which of the following steps in transcription is catalysed by RNA polymerase ?
📘 Explanation:
All of the above
Q6.
Control of gene expression takes place at the level of
📘 Explanation:
It takes place at the level of transcription
Q7.
Which was the last human chromosome to be completely sequenced ?
📘 Explanation:
Chromosome X was the last human chromosome to be completely sequenced
Q8.
In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called
📘 Explanation:
Such a DNA is called cDNA
Q9.
If the sequence of initrogen bases of the coding strand of DNA in a transcription unit is: 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be
📘 Explanation:
Sequence will be 5’ – GUAAGUA – 3’.
Q10.
The RNA polymerase holocnzyme transcribes
📘 Explanation:
The RNA polymerase holocnzyme transcribes the promoter and the terminator region
Q11.
If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be
Q12.
The amino acid attaches to the tRNA at its
📘 Explanation:
The amino acid attaches to the tRNA at its 3’ – end
Q13.
To initiate translation, the wiRNA first bind to
📘 Explanation:
bind to the smaller ribosomal sub-unit
Q14.
In E. colt, the lac operon gets switched on when
📘 Explanation:
In E. colt, the lac operon gets switched on when lactose is present and it binds to the repressor
Q15.
In DNA strand, the nucleotides are linked together by
📘 Explanation:
In DNA strand, the nucleotides are linked together by phosphodiester bonds
Q16.
If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?
📘 Explanation:
30%
Q17.
If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?
📘 Explanation:
The sequence of bases on complementary strand TACTACGT
Q18.
How far is each base pair from the next one in DNA double helix model ?
Q19.
Synthesis of DNA from RNA is explained by
📘 Explanation:
all of these
Q20.
Histone proteins are
📘 Explanation:
Histone proteins are basic, positively charged
Q21.
The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called
📘 Explanation:
seen as ‘beads-on string’ when viewed under electron microscope are called nucleosomes
Q22.
Find out the wrong statement about heterochromatin,
Q23.
They year 2003 was celebrated as the 50th anniversary of discovery of
📘 Explanation:
They year 2003 was celebrated as the 50th anniversary of discovery of structure of DNA by Watson and Crick
Q24.
Amino acids which are specified by single codons are
📘 Explanation:
Amino acids which are specified by single codons are tryptophan and methionine
Q25.
Which out of the following statements is incorrect ?
📘 Explanation:
Genetic code is ambiguous is incorrect.
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