Read the following statements and choose the set of correct statements:
A. Euchromatin is loosely packed chromatin
B. Heterochromatin is transcriptionally active
C. Histone octomer is wrapped by negatively charged DNA in nucleosome
D. Histones are rich in lysine and arginine
E. A typical nucleosome contains 400 bp of DNA helix
Choose the correct answer from the options given below:

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• B, D and E Only
• A, C and D Only
• B and E Only
• A, C and E Only
Correct Option: B  [ A, C and D Only ]

Remark:

If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• Sequence annotation
• Gene mapping
• Expressed sequence tags
• Bioinformatics
Correct Option: A  [ Sequence annotation ]

Remark:

The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.
A. It is also called as the earlywood
B. In spring season cambium produces xylem elements with narrow vessels
C. It is lighter in colour
D. The springwood along with autumnwood shows alternate concentric rings forming annual rings
E. It has lower density
Choose the correct answer from the options given below :

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• A, B, D and E Only
• A, C, D and E Only
• A, B and D Only
• C, D and E Only
Correct Option: B  [ A, C, D and E Only ]

Remark:

In an E.coli strain i gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• z, y, a genes will be transcribed
• z, y, a genes will not be translated
• RNA polymerase will bind the promoter region
• Only z gene will get transcribed
Correct Option: B  [ z, y, a genes will not be translated ]

Remark:

If the length of a DNA molecule is 1.1 metres, what will be the approximate number of base pairs?

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• 6.6 x 10⁶ bp
• 3.3 x 10⁹ bp
• 6.6 x 10⁹ bp
• 3.3 x 10⁶ bp
Correct Option: B  [ 3.3 x 10⁹ bp ]

Remark:

Ten E.coli cells with ¹⁵N- dsDNA are incubated in medium containing ¹⁴N nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from ¹⁵N ?

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• 40 cells
• 60 cells
• 80 cells
• 20 cells
Correct Option: B  [ 60 cells ]

Remark:

The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%.
What will be the sequence of these genes on a linear chromosome ?

NEET-2022 [Molecular-Basis-of-Inheritance] [class-xii ]

• d, b, a, c
• a, b, c, d
• a, c, b, d
• a, d, b, c
Correct Option: C  [ a, c, b, d ]

Remark:

Complete the flow chart on central dogma.

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

• (A)-Replication; (B)-Transcription; (C)-Transduction; (D)-Protein
• (A)-Translation; (B)-Replication; (C)-Transcription; (D)-Transduction
• (A)-Replication; (B)-Transcription; (C)-Translation; (D)-Protein
• (A)-Transduction; (B)-Translation; (C)-Replication; (D)-Protein
Correct Option: C  [ (A)-Replication; (B)-Transcription; (C)-Translation; (D)-Protein ]

Remark:

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

• Transcribes rRNAs (28S, 18S and 5.8S)
• Transcribes tRNA, 5s rRNA and snRNA
• Transcribes precursor of mRNA
• Transcribes only snRNAs
Correct Option: B  [ Transcribes tRNA, 5s rRNA and snRNA ]

Remark:

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as:

NEET-2021 [Molecular-Basis-of-Inheritance] [class-xii ]

• Satellite DNA
• Repetitive DNA
• Single nucleotides
• Polymorphic DNA
Correct Option: B  [ Repetitive DNA ]

Remark: