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Molecular Basis of Inheritance · Question 88

AIPMT 2015MCQMedium📈 Topic in 25% papers+4−1
1

Satellite DNA is important because it :

  1. Shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.
  2. does not code for proteins and is same in all members of the population.
  3. codes for enzymes needed for DNA replication.
  4. codes for proteins needed in cell cycle.

Answer

(1) Shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

Solution

As per NCERT, satellite DNA sequences (repetitive DNA) normally do not code for any proteins, but they form a large portion of the human genome. These sequences show a high degree of polymorphism and form the basis of DNA fingerprinting.

⇒ The polymorphism is inherited from parents to children, so every individual carries a characteristic pattern; this is why satellite DNA is used in paternity testing and forensics.

∴ Options (3) and (4) are wrong (satellite DNA is non-coding) and option (2) is wrong (it varies from person to person, it is not the same in all members of a population).

Answer: (1)

AIPMT 2015

Keep practising — Molecular Basis of Inheritance

2

Gene regulation governing lactose operon of E. coli that involves the lac I gene product is

  1. negative and inducible because repressor protein prevents transcription.
  2. positive and inducible because it can be induced by lactose
  3. negative and repressible because repressor protein prevents transcription
  4. feedback inhibition because excess of -galactosidase can switch off transcription
AIPMT 2015 (Cancelled)
3

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%
AIPMT 2015 (Cancelled)
4

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
5

Transformation was discovered by :

  1. Griffith
  2. Watson and Crick
  3. Hershey and Chase
  4. Meselson and Stahl
AIPMT 2014
6

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
7

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

  1. Blotting
  2. PCR
  3. Electrophoresis
  4. Autoradiography
AIPMT 2014
8

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
9

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
10

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
11

[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)

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