Table of Contents
- 1 What happen if more than one ribosome is attached to a strand of mRNA?
- 2 Why are ribosomes important what do you think will happen if ribosomes are removed from a cell?
- 3 How many ribosomes typically attach to and translate a single prokaryotic mRNA molecule?
- 4 Can mRNA be reused by a ribosome?
- 5 What happens when a ribosome finishes reading an mRNA molecule?
What happen if more than one ribosome is attached to a strand of mRNA?
Multiple ribosomes can translate a single mRNA molecule at the same time, but all of these ribosomes must begin at the first codon and move along the mRNA strand one codon at a time until reaching the stop codon.
What is the benefit of multiple ribosomes working simultaneously on an mRNA?
More than one ribosome can translate an mRNA at one time, making it possible to produce many polypeptides simultaneously from a single mRNA.
What is it called when ribosomes are attached to mRNA?
The group of ribosomes bound to an mRNA molecule is called a polyribosome, or polysome. Each ribosome within the group functions independently to synthesize a separate polypeptide chain.
Why are ribosomes important what do you think will happen if ribosomes are removed from a cell?
(a) If ribosomes are removed from the cell, there will be no protein synthesis. The cell will thus lose the capacity to perform further due to lack of metabolic products. The cell will eventually die.
How many tRNAs can fit inside a ribosome at once?
Mechanistically, elucidation of the elongation cycle poses a fascinating problem: it is by now realized that during this cycle, each end of the tRNA molecule interacts successively with more than one site on both subunits. Only two tRNAs are bound to the ribosome at any given time during the elongation cycle.
How many times can mRNA be translated?
However, errors occurring during transcription often elicit more dire consequences than those occurring during translation because individual mRNAs can be translated up to 40 times (primary sources), resulting in a burst of flawed proteins.
How many ribosomes typically attach to and translate a single prokaryotic mRNA molecule?
Globin protein is synthesized by a set of 5 ribosomes attached to each mRNA (pentasomes). The ribosomes appear as squashed spherical objects of ~7 nm (70 Å) in diameter, connected by a thread of mRNA. The ribosomes are located at various positions along the messenger.
What happens if the ribosomes stops working?
Without ribosomes to produce proteins, cells simply wouldn’t be able to function properly. They would not be able to repair cellular damage, create hormones, maintain cellular structure, proceed with cell division or pass on genetic information via reproduction.
What is the major job of the ribosomes?
Ribosomes have two main functions — decoding the message and the formation of peptide bonds. These two activities reside in two large ribonucleoprotein particles (RNPs) of unequal size, the ribosomal subunits. Each subunit is made of one or more ribosomal RNAs (rRNAs) and many ribosomal proteins (r-proteins).
Can mRNA be reused by a ribosome?
Can a single strand of mRNA be reused in transcription more than once? Short answer: Yes. It happens all the time, depending on the specific cell’s protein needs. An mRNA has a “lifetime” during which it can be picked up by another ribosome for translation.
Can multiple ribosomes be attached to the same mRNA strand?
Several ribosomes can be attached to the same mRNA strand, this structure is called a polysome. Ribosomes have only a temporary existence. When they have synthesised a polypeptide the two sub-units separate and are either re-used or broken up.
What is the function of a ribosome in a cell?
Ribosomes. After post-transcriptional processing, mRNA leaves the cell nucleus and bonds with a ribosome, a structure composed of proteins and RNA (rRNA) that assists in the binding process between mRNA codons and tRNA anticodons. While ribosome can only work on one mRNA strand at a time, multiple ribosomes can bind to any mRNA strand…
What happens when a ribosome finishes reading an mRNA molecule?
When a ribosome finishes reading an mRNA molecule, these two subunits split apart. Ribosomes are ribozymes, because the catalytic peptidyl transferase activity that links amino acids together is performed by the ribosomal RNA.
What are polyribosomes and how do they work?
After post-transcriptional processing, mRNA leaves the cell nucleus and bonds with a ribosome, a structure composed of proteins and RNA (rRNA) that assists in the binding process between mRNA codons and tRNA anticodons. While ribosome can only work on one mRNA strand at a time, multiple ribosomes can bind to any mRNA strand to form polyribosomes.