The first genetic material could be

d) RNA | The first genetic material could be RNA

The human chromosome with the highest and least number of genes in them are respectively

c) chromosome 1 and Y | chromosome 1 and Y is the correct answer.

Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?

b) Maurice Wilkins | Maurice Wilkins contributed in development of double helix model

Which of the following steps in transcription is catalysed by RNA polymerase ?

d) All of the above | All of the above

Control of gene expression takes place at the level of

b) transcription | It takes place at the level of transcription

Which was the last human chromosome to be completely sequenced ?

d) Chromosome X | Chromosome X was the last human chromosome to be completely sequenced

In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

c) cDNA | Such a DNA is called cDNA

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

d) 5’ – GUAAGUA – 3’. | Sequence will be 5’ – GUAAGUA – 3’.

The RNA polymerase holocnzyme transcribes

b) the promoter and the terminator region | The RNA polymerase holocnzyme transcribes the promoter and the terminator region

The amino acid attaches to the tRNA at its

b) 3’ – end | The amino acid attaches to the tRNA at its 3’ – end

To initiate translation, the wiRNA first bind to

a) the smaller ribosomal sub-unit | bind to the smaller ribosomal sub-unit

In E. colt, the lac operon gets switched on when

a) lactose is present and it binds to the repressor | In E. colt, the lac operon gets switched on when lactose is present and it binds to the repressor

In DNA strand, the nucleotides are linked together by

b) phosphodiester bonds | In DNA strand, the nucleotides are linked together by phosphodiester bonds

If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?

c) TACTACGT | The sequence of bases on complementary strand TACTACGT

b) basic, positively charged | Histone proteins are basic, positively charged

Find out the wrong statement about heterochromatin,

c) It is transcriptionally active. |

They year 2003 was celebrated as the 50th anniversary of discovery of

b) structure of DNA by Watson and Crick | They year 2003 was celebrated as the 50th anniversary of discovery of structure of DNA by Watson and Crick

Amino acids which are specified by single codons are

b) tryptophan and methionine | Amino acids which are specified by single codons are tryptophan and methionine

Which out of the following statements is incorrect ?

a) Genetic code is ambiguous. | Genetic code is ambiguous is incorrect.

The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called

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Q.21. The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called

nucleotides
nucleosides
histone octamer
nucleosomes

Answer: (d) nucleosomes
Explanation: seen as ‘beads-on string’ when viewed under electron microscope are called nucleosomes

Molecular Basis Of Inheritance (class 12th Biology) Revision Test | MCQs For NEET

25 Questions 5 Attempts 1.83K Seen

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. Start Test without Login in
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Q.No.	Que title	Option 1 (a)	Option 2 (b)	Option 3 (c)	Option 4 (d)
1	Which of the following statements is the most appropriate for sickle cell anaemia ?	It cannot be treated with iron supplements.	It is a molecular disease.	It conferes resistance to acquiring malaria	All of the above.
2	The first genetic material could be	protein	cabohydrates	DNA	RNA
3	The human chromosome with the highest and least number of genes in them are respectively	chromosome 21 and Y	chromosome 1 and X	chromosome 1 and Y	chromosome X and Y
4	Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?	Rosalind Franklin	Maurice Wilkins	Erwin Chargaff	Meselson and Stahl
5	Which of the following steps in transcription is catalysed by RNA polymerase ?	Initiation	Elongation	Termination	All of the above
6	Control of gene expression takes place at the level of	DNA-replication	transcription	translation	none of the above
7	Which was the last human chromosome to be completely sequenced ?	Chromosome 1	Chromosome 11	Chromosome 21	Chromosome X
8	In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called	A – DNA	B – DNA	cDNA	rDNA
9	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	5’ – AUG A AUG – 3’	5’ – UACUU AC – 3’	5’ – CAUUCAU – 3’	5’ – GUAAGUA – 3’.
10	The RNA polymerase holocnzyme transcribes	the promoter, structural gene and the terminator region	the promoter and the terminator region	the structural gene and the terminator region	the structural gene only.
11	If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be	5’ – UAC – 3’	5’ – CAU – 3’	5’-AUG – 3’	5’ – GUA – 3’
12	The amino acid attaches to the tRNA at its	5’- end	3’ – end	anticodon site	DHUloop.
13	To initiate translation, the wiRNA first bind to	the smaller ribosomal sub-unit	the larger ribosomal sub-unit	the whole ribosome	no such specificity exists
14	In E. colt, the lac operon gets switched on when	lactose is present and it binds to the repressor	repressor binds to operator	RNA polymerase binds to the operator	lactose is present and it binds to RNA polymerase.
15	In DNA strand, the nucleotides are linked together by	glycosidic bonds	phosphodiester bonds	peptide bonds	hydrogen bonds
16	If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?	20%	40%	30%	60%
17	If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?	ATGCATGCA	AUGCAUGCA	TACTACGT	UACGUACGU
18	How far is each base pair from the next one in DNA double helix model ?	2 nm	3.4 nm	34 nm	0.34 nm
19	Synthesis of DNA from RNA is explained by	central dogma reverse	reverse transcription	feminism	all of these
20	Histone proteins are	basic, negatively charged	basic, positively charged	acidic, positively charged	acidic, negatively charged
21	The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called	nucleotides	nucleosides	histone octamer	nucleosomes
22	Find out the wrong statement about heterochromatin,	It is densely packed	It stains dark	It is transcriptionally active.	It is late replicating
23	They year 2003 was celebrated as the 50th anniversary of discovery of	transposons by Barbare Me Clintock	structure of DNA by Watson and Crick	Mendel’s laws of inheritance	biotechnology by Kary Muliis.
24	Amino acids which are specified by single codons are	phenylalanine and arginine	tryptophan and methionine	valine and proline	methionine and aroinine
25	Which out of the following statements is incorrect ?	Genetic code is ambiguous.	Genetic code is deqenerate	Genetic code is universal	Genetic code is non-overlanning.

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