Biology- Molecular Basis of Inheritance

lactose is present and it binds to the ✘ repressor binds to operator. ✘ RNA polymerase binds to the operator. ✘ lactose is present and it binds to RNA polymerase. ✔

positive, negative ✘ negative, positive ✘ negative, negative ✘ positive, positive. ✔

It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides. ✘ It carries amino acids to ribosomes ✘ It is a constituent component of ribosomes ✘ All of the above. ✔

DNA molecule being synthesised is very long. ✘ it is a more efficient process. ✘ DNA ligase has to have a role. ✔

Chromosome 21 and Y ✘ Chromosome 1 and X ✘ Chromosome 1 and Y ✘ Chromosome X and Y ✔

3' (downstream) end and 5' (upstream) end, respectively of the transcription unit. ✘ 5' (upstream) end and 3' (downstream) end, respectively of the transcription unit. ✘ the 5' (upstream) end. ✘ the 3' (downstream) end. ✔

the antiparallel nature the semiconservative nature uniform width throughout DNA uniform length in all DNA.

inducer ✘ repressor ✘ lactase ✘

UAA, UGA, UAG ✘ UAA, UUU, UGG ✘ UAA, UAG, UAC ✘ UUU, UCC, UGG ✔

RNA polymerase ✘ DNA ligase ✘ Reverse transcriptase ✘ DNA polymerase ✔