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Molecular Basis of Inheritance · Question 100

NEET 2013 (Karnataka)MCQEasy📈 Topic in 88% papers+4−1
1

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"

Answer

(4) usually not expressed unless a signal turns them "on"

Solution

As per NCERT, in the lac operon (an inducible operon) the repressor binds to the operator and prevents transcription in the absence of the inducer.

⇒ When lactose (allolactose, the inducer) is present, it binds the repressor and inactivates it; RNA polymerase then transcribes the structural genes.

∴ In an inducible operon the genes are usually switched off and are expressed only when a signal (inducer) turns them "on".

Answer: (4)

NEET 2013 (Karnataka)

Keep practising — Molecular Basis of Inheritance

2

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

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

Read the following four statements (A-D) : How many of the above statements are right ?

  1. Four
  2. Two
  3. Three
  4. One
AIPMT 2012 (Mains)
4

What is it that forms the basis of DNA Fingerprinting ?

  1. The relative proportions of purines and pyrimidines in DNA
  2. The relative amount of DNA in the ridges and grooves of the fingerprints
  3. The relative difference in the DNA occurrence in blood, skin and saliva
  4. Satellite DNA occurring as highly repeated short DNA segments
AIPMT 2012 (Mains)
5

Removal of introns and joining of exons in a defined order during transcription is called

  1. Looping
  2. Inducing
  3. Slicing
  4. Splicing
AIPMT 2012 (Prelims)
6

If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence

  1. ATCGU
  2. UAGAC
  3. AACTG
  4. TTAGU
AIPMT 2012 (Prelims)
7

Which one of the following is not a part of a transcription unit in DNA ?

  1. The structural gene
  2. The inducer
  3. A terminator
  4. A promoter
AIPMT 2012 (Prelims)
8

Removal of RNA polymerase-III from nucleoplasm will affect the synthesis of

  1. tRNA
  2. hnRNA
  3. rRNA
  4. mRNA
AIPMT 2012 (Prelims)
9

PCR and Restriction Fragment Length Polymorphism are the methods for

  1. Genetic transformation
  2. Genetic fingerprinting
  3. Study of enzymes
  4. DNA sequencing
AIPMT 2012 (Prelims)
10

The unequivocal proof of DNA as the genetic material came from the studies on a:

  1. Viroid
  2. Bacterium
  3. Fungus
  4. Bacterial virus
AIPMT 2011 (Mains)
11

Which one of the following also acts as a catalyst in a bacterial cell?

  1. 5S rRNA
  2. snRNA
  3. hnRNA
  4. 23S rRNA
AIPMT 2011 (Prelims)

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