7. Which part of the gene do the sigma unit/RNA polymerase bind to? A. exon B. e

Question

7. Which part of the gene do the sigma unit/RNA polymerase bind to? A. exon B. enhancer C. TATA box D. start codon 8. The central dogma of molecular biology states that DNA is used to make which is then used to make In other words DNA? A. proteins; mRNA B. mRNA; RNA C. tRNA; proteins D. mRNA; protein 9. When mRNA has been transcribed, there are three modifications which must be made in eukarytotes before we are ready for translation. Which of the following is NOT one of the 3 modifications? A. introns are spliced out C, a 5' cap is added B. histones are methylated D. a poly A tail is added 10. Which of the following statements best describes the difference between prokaryotic and eukaryotic gene expression? A. prokaryotes have no introns, eukaryotes do B.both transcribe and translate at the same time C. promoters are only used in eukaryotes D. a 5' cap and poly A tail are added in prokaryotes, not in eukaryotes 11. When an extra base has been inserted into a gene, the mutation is particularly harmful because all of the bases (and codons) after the insertion are wrong. This type of mutation is called A. silent B, nonsense C. frameshift D. aneuploidy mutation. 12. When a mutation leads to a substitution of an amino acid within a protein, this is a A. nonsense B. missense C. silent D. deletion

Explanation / Answer

7) the correct option is option (d) start codon AUG which recognised by the RNA polymerase to bind...

8) the correct option is option (d) mRNA to protein where DNA convert to mRNA by transcription and then mRNA codes for protein by translation .!!

9) the correct option is option (b) histone are methylation these are not post - translations modification these happen when there is a packaging or unwinding of the DNA .

11) the correct option is option (c) frameshift mutations whre the reading frame gets disturbed hence leading to the coding of different protein...

10) the correct option is option (a) prokaryotic organism no introns but eukaryotic organism have introns hence eukaryotic organism go splicing ..!!

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