Molecular Basis of Inheritance

NEET Biology · 262 questions · Page 10 of 27 · Click an option or "Show Solution" to reveal answer

Q91

Read the following four statements (A-D).

A Two

B Three

C Four

D One

Correct Answer

Option A

Solution

(a) Statement A & D is correct. Regulation of lac operon by repressor is referred as negative regulation.

Q92

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

A Looping

B Inducing

C Slicing

D Splicing

Correct Answer

Option D

Solution

(d) Removal of introns by spliceosome in hnRNA and joining of exons by DNA ligase in a defined order during transcription is called splicing.

Q93

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

A The inducer

B A terminator

C A promoter

D The structural gene

Correct Answer

Option A

Solution

(a) Transcription unit consists of promoter, structural gene & terminator.

Q94

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

A t RNA

B hn RNA

C m RNA

D r RNA

Correct Answer

Option A

Solution

(a) Removal of RNA polymerase III from nucleoplasm will affect the synthesis of tRNA while RNA polymerase I forms $r$ -RNA and RNA polymerase II form m-RNA in eukaryotes.

Q95

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

A Universal

B Non-overlapping

C Ambiguous

D Degeneracy

Correct Answer

Option C

Solution

Q96

Which one of the following is wrongly matched?

A Transcription - Writing information from DNA to tRNA.

B Translation-Using information in mRNA to make protein

C Repressor protein - Binds to operator to stop enzyme synthesis.

D Operon - Structural genes, operator and promoter.

Correct Answer

Option A

Solution

(a) Process of copying genetic information from DNA to RNA is called transcription.

At a time only one DNA strand is being transcribed into RNA.

Q97

Which one of the following is the starter codon?

A AUG

B UGA

C UAA

D UAG

Correct Answer

Option A

Solution

(a) The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome.

The start codon always codes for methionine in eukaryotes and a modified Met (fMet) in prokaryotes.

The most common start codon is AUG.

Q98

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

A 11

B 33

C 333

D 1

Correct Answer

Option B

Solution

(b) If deletion happens at the $901^{\text{st}}$ position, then the remaining 98 bases specifying 33 codons of amino acids will be altered.

Q99

The experimental proof for semiconservative replication of DNA was first shown in a

A Fungus

B Bacterium

C Virus

D Plant

Correct Answer

Option B

Solution

(b) Semi-conservative DNA replication was first shown in bacterium Escherichia coli by Matthew Meselson and Franklin Stahl.

Q100

In the process of transcription in Eukaryotes, the RNA polymerase I transcribes -

A Precursor of mRNA, hnRNA

B mRNA with additional processing, capping and tailing

C tRNA, 5srRNA and snRNAs

D rRNAs - 28S, 18S and 5.8S

Correct Answer

Option D

Solution

(d) RNA polymerase I transcribes 28S, 18S and 5.8S rRNAs.

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