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Molecular Basis of Inheritance · Question 90

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 75% papers+4−1
1

In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are

  1. G 17%, A 16.5%, T 32.5%
  2. G 17%, A 33%, T 33%
  3. G 8.5%, A 50%, T 24.5%
  4. G 34%, A 24.5%, T 24.5%

Answer

(2) G 17%, A 33%, T 33%

Solution

As per Chargaff's rule (NCERT), in double-stranded DNA the amount of A = T and G = C.

∵ C = 17\% ⇒ G = 17\%

⇒ A + T = 100\% - (17\% + 17\%)

= 66\%

∵ A = T ⇒ A = T = 66\%2 = 33\%

∴ G 17%, A 33%, T 33%.

Answer: (2)

AIPMT 2015 (Cancelled)

Keep practising — Molecular Basis of Inheritance

2

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.
AIPMT 2014
3

Transformation was discovered by :

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

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
5

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

  1. Blotting
  2. PCR
  3. Electrophoresis
  4. Autoradiography
AIPMT 2014
6

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
7

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
8

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
9

[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)
10

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

  1. Ambiguous
  2. Universal
  3. Degeneracy
  4. Non-overlapping
NEET 2013 (Karnataka)
11

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)

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