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Test: Transcription, Genetic Code & Types of RNA


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10 Questions MCQ Test Biology Class 12 | Test: Transcription, Genetic Code & Types of RNA

Test: Transcription, Genetic Code & Types of RNA for NEET 2023 is part of Biology Class 12 preparation. The Test: Transcription, Genetic Code & Types of RNA questions and answers have been prepared according to the NEET exam syllabus.The Test: Transcription, Genetic Code & Types of RNA MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Transcription, Genetic Code & Types of RNA below.
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Test: Transcription, Genetic Code & Types of RNA - Question 1

Removal of the introns and joining of the exons in a defined order in a transcription unit is called _________.

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 1
  • In some eukaryotes, genes consist of coding nucleotide sequences, which are separated from each other by blocks of non-coding sequences. The coding sequences here are called exons and non-coding sequences are introns.
  • The primary transcript from a typical eukaryotic gene contains introns as well as exons. The introns are removed from this primary transcript by a process called RNA splicing


Fig: RNA Splicing 

Hence, the correct option is D.
NCERT Reference: Page no. 111 of topic “6.5.3 Types of RNA and the process of Transcription” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 2

During transcription, the DNA site at which RNA polymerase binds is called _________.

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 2
  • Transcription is when RNA is made from DNA.
  • During transcription, RNA polymerase makes a copy of a gene from the DNA to mRNA as needed. During transcription, the DNA site at which RNA polymerase binds is called the promoter.
  • Transcription begins with binding of sigma factor proteins to the RNA polymerase holoenzyme, thus, allowing it to bind to promoter DNA. 
  • RNA polymerase creates a transcription bubble, which separates the two strands of the DNA helix and initiates the transcription. 

Transcription in progress: RNA polymerase slides along the DNA and makes an RNA copy (Genes are the only parts of DNA that get copied into RNA):

Hence, the correct option is C.
NCERT Reference: Page no. 108 of topic “6.5 TRANSCRIPTION” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 3

The coding segment of DNA is called _________.

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 3
  • The genetic code by which DNA stores the genetic information consists of "codons" of three nucleotides. These codon translates to form protein sequences.
  • A codon is defined by the initial nucleotide from which translation starts known as start codon.


Fig: Initiation Codon

Hence, the correct option is D.
NCERT Reference: Page no. 111 of topic “6.6 GENETIC CODE” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 4

Some amino acids are coded by more than one codon hence, the code is:

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 4

The genetic code is degenerate: Some amino acids are encoded by more than one codon, in as much as there are 64 possible base triplets and only 20 amino acids. In fact, 61 of the 64 possible triplets specify particular amino acids and 3 triplets (called stop codons) designate the termination of translation.

Thus, for most amino acids, there is more than one codeword.


Fig: Codons synthesizing amino acids

Hence, the correct option is C.
NCERT Reference: Page no. 112 of topic “6.6 GENETIC CODE” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 5

Out of 64 codons, the number of codons with GGG is​:

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 5

GGG code is present only 1 time and the amino acid produced by GGG is glycine.

Hence, the correct option is B.
NCERT Reference: Page no. 112 of topic “6.6 GENETIC CODE” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 6

Control of gene expression takes place at the level of _________.

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 6

Transcription is the first step of gene expression. In this process, a particular segment of DNA is copied into mRNA. Thus. it controls gene expression.

Test: Transcription, Genetic Code & Types of RNA - Question 7

The amino acid attaches to the tRNA at its​:

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 7
  • tRNA has an anticodon loop that has bases complementary to the code, it also has an amino acid acceptor end by which it binds to amino acids.
  • The site lies at the 3' end opposite the anticodon in tRNAs are specific for each amino acid.

Aminoacyl Transfer RNA - an overview | ScienceDirect Topics
Fig: tRNA binding site 
Hence, the correct option is C.
NCERT Reference: Page no. 114 of topic “6.6.2 tRNA– the Adapter Molecule” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 8

The portion of DNA which contains information for an entire polypeptide is called:

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 8
  • A part of one chain of DNA molecule known as the sense strand which codes a polypeptide is called cistron.
  • Each cistron consists of many codons, and a codon comprises three consecutive nitrogenous bases.

Fig: DNA transcription unit

Hence, the correct option is D.
NCERT Reference: Page no. 109 of topic “6.5 TRANSCRIPTION” of chapter 6.

Test: Transcription, Genetic Code & Types of RNA - Question 9

DNA elements, which can switch their positions, are called _________.

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 9

A transposable element (TE or transposon) is a DNA sequence that can jump to different locations within a genome also known as "jumping genes", sometimes creating or reversing mutations and altering the cell's genetic identity and genome size.


Fig: Transposons 

Hence, the correct option is D.

Test: Transcription, Genetic Code & Types of RNA - Question 10

The following code codes for which of the amino acids respectively?
AUG and GUG

Detailed Solution for Test: Transcription, Genetic Code & Types of RNA - Question 10

Three base triplets form a codon that codes for an amino acid. Thus AUG codes for methionine and GUG codes for Valine. AUG and GUG are both initiating codons for translation.

Gr10-27

Hence, the correct option is B.
NCERT Reference: Page no. 112 of topic “6.6 GENETIC CODE” of chapter 6.

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