What was the key finding from Griffith's experiments using live and heat-killed pathogenic bacteria?

Genetic material can be transferred from dead to live bacteria

Bacteria with a smooth coat could kill mice

Bacteria with a rough coat are not lethal

Elongation of the RNA polynucleotide chain always takes place:

5 ' - 3 ' direction with new nucleotide always added at the 3 ' site

In any direction along the entire length of single DNA strand

There are two strands which run antiparallel one in 5 ' → 3 ' direction and other in 3 ' → 5 ' direction

The proportion of adenine in relation to thymine varies with the organism

The total amount of purine nucleotides and pyrimidine nucleotides is not always equal

There are two strands which run parallel in the 5 ' → 3 ' direction

Which one of the following is wrongly matched?

Transcription - Writing information from DNA to tRNA

Translation - Using information in mRNA to make protein

Repressor protein - Binds to operator to stop enzyme synthesis

Operon - Structural genes, operator and regulator

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A given double stranded DNA molecule is 1,00,000 base pairs long. The length of this DNA molecule will be

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Important Questions on Molecular Basis of Inheritance

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 13

A polypeptide of five amino acids is synthesized during protein synthesis in eukaryotic cells. Which one of the following can be the correct polypeptide?

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 14

Match Column I with Column II and select the correct option from the given options.

	Column I		Column II
$(a)$	Operator site	$(i)$	Binding site for RNA polymerase
$(b)$	Promoter site	$(i i)$	Binding site for repressor molecule
$(c)$	Regulator gene	$(i i i)$	Codes for protein/enzyme
$(d)$	Structural gene	$(i v)$	Codes for repressor molecule

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 15

Read the sequence of nucleotides in the given segment of mRNA and the respective amino acid sequence in the polypeptide chain to answer the questions.
Question Image

The nucleotide sequence of the DNA strand from which this mRNA was transcribed is

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 16

Consider the following statements with respect to transcription and select the correct option stating true (T) or false (F).

A. In transcription, only a segment of DNA and only one of the strands is copied into RNA.

B. Terminator is located upstream of the structural gene.

C. The nascent RNA synthesised by RNA polymerase II is called hnRNA in eukaryotes.

D. Intervening sequences do appear in processed RNA.

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 18

If there are

48 \times 10^{8}

base pairs in a eukaryotic cell, then what will be the number of beads on string structure present in the nucleus?

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 19

To code the 50 amino acids in a polypeptide chain, what will be the minimum number of nucleotides in its cistron?

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 21

Refer to the given steps of DNA replication.
(i) Exposure of DNA strands
(ii) Synthesis of RNA primer
(iii) Activation of deoxyribonucleotides
(iv) Chain formation
(v) Base pairing
(vi) Proof reading and DNA repair
(vii) DNA polymerase attaches at "Ori" site
Select the correct sequence of DNA replication.

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Biology Crash Course NEET>Chapter 28 - Molecular Basis of Inheritance>Level 3>Q 22

About _____ nucleotides are present in DNA, which is wrapped over histone octamer to complete 3 about

1 \frac{3}{4}

turns.

A given double stranded DNA molecule is 1,00,000 base pairs long. The length of this DNA molecule will be

Important Questions on Molecular Basis of Inheritance

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