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Molecular Basis of Inheritance · Question 91

AIPMT 2014Multiple CorrectMedium📈 Topic in 88% papers+4−1
1

Which one of the following is wrongly matched?

  1. Transcription – Writing information from DNA to t-RNA
  2. Operon – Structural genes, operator and promoter
  3. Repressor protein – Binds to operator to stop enzyme synthesis
  4. Translation – Using information in m-RNA to make protein.

Answer

(1) Transcription – Writing information from DNA to t-RNA, (2) Operon – Structural genes, operator and promoter

Solution

(1) As per NCERT, transcription is the process of copying genetic information from one strand of DNA into RNA; the information that is used to make proteins is written into mRNA (tRNA only brings amino acids and reads the code). Writing information from DNA to tRNA is therefore a wrong description ⇒ wrongly matched.

(2) As per NCERT, the lac operon consists of one regulatory gene (the i gene) and three structural genes (z, y and a) along with the promoter and operator; an operon is thus not only structural genes, operator and promoter, as its regulator gene is left out ⇒ wrongly matched.

(3) The repressor protein binds to the operator and prevents RNA polymerase from transcribing the operon, so the enzymes are not made ⇒ correctly matched.

(4) Translation is the process of polymerisation of amino acids to form a polypeptide using the information in mRNA ⇒ correctly matched.

Answer: (1), (2)

AIPMT 2014

Keep practising — Molecular Basis of Inheritance

2

Transformation was discovered by :

  1. Griffith
  2. Watson and Crick
  3. Hershey and Chase
  4. Meselson and Stahl
AIPMT 2014
3

Select the correct option ;

  1. Direction of RNA synthesis 3'–5', Direction of reading of the template DNA strand 5'–3'
  2. Direction of RNA synthesis 5'–3', Direction of reading of the template DNA strand 5'–3'
  3. Direction of RNA synthesis 5'–3', Direction of reading of the template DNA strand 3'–5'
  4. Direction of RNA synthesis 3'–5', Direction of reading of the template DNA strand 3'–5'
AIPMT 2014
4

An analysis of chromosomal DNA using the Southern hybridization technique does not use:

  1. Blotting
  2. PCR
  3. Electrophoresis
  4. Autoradiography
AIPMT 2014
5

Commonly used vectors for human genome sequencing are :

  1. BAC and YAC
  2. T/A Cloning Vectors
  3. T-DNA
  4. Expression Vectors
AIPMT 2014
6

The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C. [figure]

  1. A-translation B-extension C-Rosalind Franklin
  2. A-translation B-transcription C-Erwin Chargaff
  3. A-transcription B-translation C-Francis Crick
  4. A-transcription B-replication C-James Watson
NEET 2013
7

Which enzyme will be produced in a cell in which there is a non-sense mutation in the lac Y gene ?

  1. Transacetylase
  2. Lactose permease and transacetylase
  3. Lactose permease
  4. -galactosidase
NEET 2013
8

[figure] The figure gives an important concept in the genetic implication of DNA. Fill the blanks A, B and C.

  1. A - Erwin Chargaff B - translation C - replication
  2. A - Maurice Wilkins B - transcription C - translation
  3. A - Francis Crick B - translation C - transcription
  4. A - James Watson B - replication C - extension
NEET 2013 (Karnataka)
9

Which of the following is not a property of the genetic code ?

  1. Ambiguous
  2. Universal
  3. Degeneracy
  4. Non-overlapping
NEET 2013 (Karnataka)
10

In an inducible operon, the genes are :

  1. usually expressed unless a signal turns them "off"
  2. always expressed
  3. never expressed
  4. usually not expressed unless a signal turns them "on"
NEET 2013 (Karnataka)
11

One of the most frequently used techniques in DNA fingerprinting is :-

  1. SSCP
  2. SCAR
  3. VNTR
  4. AFLP
NEET 2013 (Karnataka)

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