What does spliceosome consist of?
What does spliceosome consist of?
The spliceosome is a large RNP machinery composed of snRNAs and a myriad of proteins and is essential for splicing of nuclear introns, which are not catalytically active (except for some autocatalytic group I introns present in the nucleus of a few lower eukaryotes).
What type of enzyme is the spliceosome?
The extensive interplay of RNA and proteins in aligning the pre-mRNA’s reactive groups, and the presence of both RNA and protein at the core of the splicing machinery, suggest that the spliceosome is an RNP enzyme.
What is the splicing process?
RNA splicing is a process that removes the intervening, non-coding sequences of genes (introns) from pre-mRNA and joins the protein-coding sequences (exons) together in order to enable translation of mRNA into a protein.
What is alternative splicing and why is it important?
Alternative splicing of RNA is a crucial process for changing the genomic instructions into functional proteins. It plays a critical role in the regulation of gene expression and protein diversity in a variety of eukaryotes. In humans, approximately 95% of multi-exon genes undergo alternative splicing.
Why is a poly-A tail added to mRNA?
The poly-A tail is a long chain of adenine nucleotides that is added to a messenger RNA (mRNA) molecule during RNA processing to increase the stability of the molecule. The poly-A tail makes the RNA molecule more stable and prevents its degradation.
Why does it take only a few homeotic genes?
Why does it take only a few homeotic genes to control the development of a eukaryote? (1 point) because each homeotic gene begins a cascade of events that leads to the formation of a specific body part******* because eukaryotes have surprisingly small numbers of genes in any one cell.
Why do cells regulate which genes are expressed and which aren t?
Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell, for example. Gene regulation also allows cells to react quickly to changes in their environments.