During replication, individual strands of DNA are unwound by Select one: O a. DN

Question

During replication, individual strands of DNA are unwound by Select one: O a. DNA helicase. b. helix-destabilizing proteins O c. DNA polymerases. O d. RNA primer. All of the following statements concerning mRNA processing are correct ExCEPT. Select one: O a. A primary transcript is usually longer than the mRNA transcript that leaves the nucleus. O b. RNA splicing involves the activity of a spliceosome. O c. The existence of exons and introns may facilitate crossing over between regions of a gene that code for polypeptide domains. O d. Protein catalysts splice out introns and join exons together. An allosteric site is Select one: O a. a specific receptor on a strand of DNA that blocks the synthesis of specified mRNA. b. a specific site on an enzyme apart from the active site. Molecules that bind here will change the shape of the active site. c.the site on a RNA polymerase that binds to the DNA strand to be transcribed d. the active site on an enzyme.

Explanation / Answer

1) Helicase

Helicase is ATP bounded enzymes which causes the breakage of hydrogen bounds between two strands of DNA and unwinding it.

2) The existence of introns and exons facilitate crossing over between regions of genes that code for the polypeptide domains.

3) Allosteric site is the specific site on an enzyme apart from the active site molecules that bind here will change the shape of the active site.

Apart from the subtrates any molecules will bind to the allosteric site and causes the change in active site causing change in stability.

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