PHYSIOLOGY GENETICS QUIZ

Which statements about micro-RNA’s (miRNA) is correct ?

• miRNAs are formed in the cytoplasm and repress translation or promote degradation of messenger RNA (mRNA) before it can be translated

• miRNAs are formed in the nucleus and then processed in the cytoplasm by the dicer enzyme

• miRNAs are short (21 to 23 nucleotide) double stranded RNA fragments that regulate gene expression

• miRNAs repress gene transcription

Which of the following does not play direct role in the process of transcription ?

• Helicase

• RNA Polymerase

• Chain terminating sequence

• Activated RNA molecules

• Promoter sequence

Which statement about mRNA is correct ?

• mRNA carries the genetic code to the cytoplasm

• mRNA carries activated amino acids to the ribosomes

• mRNA is composed of single stranded RNA molecule of 21 to 23 nucleotides that can regulate gene transcription

• mRNA forms ribosomes

‘Redundancy’ or ‘degeneration’ of the genetic code occurs during which step of protein synthesis ?

• Dna replication

• Transcription

• Post-transcriptional modification

• Translation

• Protein glycosylation

What controls the sequence of amino acids in protein molecule ?

• Genetic code

• Nucleotide

• Code word

• Hydrogen bond

The stop code for the protein synthesis is :-

• AUG

• AUU

• UAG

• UUT

The enzyme which builds a mRNA strand complementary to the DNA transcription unit is called

• Dna polymerase

• RNA Polymerase

• Helicase

• Dna ligase

What are the repeating units of nucleic acids. ?

• Phosphate molecule

• Nucleotides

• Bases

• Sugar molecules

Which of the following is not needed for DNA transcription?

• Ribosomes

• Nucleotides

• DNA

• Enzymes

Where is Ribosomal RNA processed in the nucleus ?

• Nuclear envelop

• Dna

• Nucleolus

• Nucleotide