Biology

Molecular Genetics

917 Questions

Molecular genetics explores the mechanisms of genetic information transfer, including DNA replication, transcription, and translation. It is a core component of biology syllabi. These concepts frequently appear in general science sections of major competitive exams.

DNA replicationTranscription processTranslation processRNA typesCentral dogma

Molecular Genetics Questions

Multiple choice
  1. The presence of DNA in RER

  2. The presence of DNA in SER

  3. The presence of ribosomes in SER

  4. The presence of ribosomes in RER

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The key difference is that RER (Rough Endoplasmic Reticulum) has ribosomes attached to its surface, which is why it appears rough under a microscope. SER (Smooth Endoplasmic Reticulum) lacks ribosomes and has different functions like lipid synthesis. Neither contains DNA.

Multiple choice
  1. single-stranded DNA

  2. protein

  3. single-stranded RNA

  4. double-stranded RNA

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Viroids consist of a single-strand RNA molecule and lack a protective protein coat. They were discovered in the late 1960s.

Multiple choice
  1. FC region of nucleolus

  2. FC region or FC-DFC boundary

  3. DFC region

  4. GC-DFC boundary

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Transcription of rDNA takes place either in FC region or at FC-DFC boundary.

Multiple choice
  1. DNA replication

  2. transcription

  3. RNA processing

  4. snRNP biogenesis

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cajal bodies are involved in a number of roles in RNA processing like snRNA maturation and histone mRNA modification.

Multiple choice
  1. rRNA is the most abundant type of RNA in a cell.

  2. Anticodon occurs in mRNA.

  3. Okazaki fragments are formed during replication.

  4. Nonsense codons do not code for any amino acid.

  5. DNA replication is semiconservative.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because anticodon is a sequence of three adjacent nucleotides in transfer RNA (tRNA) that binds to a corresponding codon in messenger RNA (mRNA) and designates a specific amino acid during protein synthesis.