How does RNA polymerase recognize the end of a gene?

How does RNA polymerase recognize the end of a gene?

As the RNA polymerase approaches the end of the gene being transcribed, it hits a region rich in C and G nucleotides. The RNA transcribed from this region folds back on itself, and the complementary C and G nucleotides bind together. The result is a stable hairpin that causes the polymerase to stall.

How does RNA polymerase recognize the start and end of the gene quizlet?

How does RNA polymerase recognize the start and end of a gene? it conveys genetic messages from DNA to the translation machinery of the cell. It is transcribed from DNA and the information in the mRNA is then translated into polypeptides. How does a ribosome facilitate protein synthesis?

Can RNA be the final product of a gene?

In the preceding section we have seen that the final product of some genes is an RNA molecule itself, such as those present in the snRNPs and in ribosomes. However, most genes in a cell produce mRNA molecules that serve as intermediaries on the pathway to proteins.

Which RNA polymerase is the most active in the cells?

Ribonucleic acid polymerase III (RNAP III), the most complex of the three nuclear polymerases present in eukaryotic cells, contains 17 subunits and synthetizes various small RNA components.

Which of the following is a function of a poly A tail in mRNA?

The poly (A) tail protects the mRNA from degradation, aids in the export of the mature mRNA to the cytoplasm, and is involved in binding proteins involved in initiating translation. Introns are removed from the pre-mRNA before the mRNA is exported to the cytoplasm.

Why doesn’t a flu shot one year give us immunity to flu in subsequent years quizlet?

Influenza vaccine is given each year because immunity decreases after a year and because influenza vaccine viruses are updated almost every year. An annual vacci- nation is recommended even if the strains included in the vaccine are not changed from one year to the next.

Can gene be RNA?

As we have discussed previously, the initial products of all genes are ribonucleic acids (RNAs). RNA is produced by a process that copies the nucleotide sequence in DNA. Since this process is reminiscent of transcribing (copying) written words, the synthesis of RNA is called transcription.

Is RNA more complex than DNA?

Two molecules are responsible for carrying this information — RNA, which is a simpler single-strand molecule, and DNA which is a more complex double-strand molecule.

Why does RNA polymerase begin transcribing a gene into mRNA?

Where does RNA polymerase begin transcribing a gene into mRNA? It starts after a certain nucleotide sequence called a promoter. It unwinds the double helix and adds nucleotides to a growing strand of RNA.

How does the RNA polymerase know where to stop?

Rho-independant – In this scenario, the polymerase begins to enter a region in the sequence saturated in G and C nucleotides. The resulting RNA from this sequence will fold in on itself, forming a hairpin like structure, which causes the polymerase to pause its action.

How does RNA polymerase know where to start transcribing a gene?

How does RNA polymerase know where to start transcribing a gene? To begin transcribing a gene, RNA polymerase binds to the DNA of the gene at a region called the promoter. Basically, the promoter tells the polymerase where to “sit down” on the DNA and begin transcribing. Click to see full answer.

Where does transcription of DNA into RNA occur?

Genes occur on both strands of DNA in a chromosome. Transcription of DNA into RNA occurs when RNA polymerase, the enzyme that makes RNA, is recruited to the region just upstream of the beginning of a gene.

What happens to the nucleotides after a hairpin in RNA?

U nucleotides after the hairpin in the RNA will interact with the A nucleotides in the parent DNA molecule, however only weakly. This weak interaction causes instability in the system, enough to cause the paused polymerase to ‘fall off’ and set the RNA free.