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What would happen if the amount of tryptophan being produced in an E.coli cell when the repressor is attached to the operator?
Wiki User
∙ 11y ago
No amount of tryptophan would be produced
Wiki User
∙ 11y ago
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Amino acids that cannot be produced by the body?
There are nine essential amino acids: histidine (essential for children), isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. These amino acids must be supplied by food; the body cannot make them.
What proteins modulate the expression of genes?
well good examples of proteins regulating gene expression can be seen in most prokaryotic operons. Such as the trp operon or lac operon. These both contain sites upstream from the multiple cistrons, which code for repressor proteins (trpR and lacI - is says I but its still a repressor protein being produced). The trp operon is under negative repressible control which means transcription is turned of by the repressor binding to the operator gene (and also switched of by presence of an effector - in this case tryptophan). The same for the lac operon (except its under inducible negative control so is switched of until an effector is present - lactose). Also i the lac operon it is under positive control by the catabolite activator protein (CAP) - When glucose is in low levels the levels of CAMP (cyclic adenosine mono-phosphate) tend to be high. CAMP binds to CAP allowing CAP to bind to a region upstream from the Lac operons promoter (Approx 16 base pairs up). This assists in allowing RNA polymerase to bind to the DNA upregulating he gene expression for the cistrons downstream). In eukaryotes (I.e. us) however it is not a simple as a well organised length of DNA like the operons. They use a complex mix of control mechanisms. Such as enhancers, silencers etc.. The 2 types of regulation can be categorised into 2 groups: Cis- acting elements and trans -acting. Cis acting - these are regions of DNA that happen to be within the close proximity of the gene they wish to (excuse the anthropomorphism) regulate. These regions of DNA do not encode proteins but are acted on by trans-acting factors. Trans elements - these are genes which encode proteins, they are usually found quite some distance away from the target length of DNA for regulation. Probably a bit long winded, but its best to be thorough(ish) ;)
What produces ribosomal RNA?
Nucleolus produces ribosomal compartments.Later they are attached in cytoplasm.
Bodily movement produced by skeletal muscles is called?
Skeletal muscles are attached to the bones by tough cords called tendons. When nerve signals are sent from the brain and spinal cord, these muscles contract to produce movement.
Ribosomal RNA is produced by this structure?
Of course! rRNA, otherwise known as 'ribosomal RNA' is what makes up ribosomes, which are found either floating in the cytoplasm freely or attached to the rough endoplasmic reticulum which is also in the cytoplasm.
How is the trp repressor protein and allosteric protein?
If Tryptophan is low in the diet, the repressor changes shape and allows the RNA polymerase to attach and copy the DNA so that Tryptophan can be produced by the cell.
What happens during enzyme repression?
this is the reverse of enzyme induction.here,E.Coli requires a regular supply of the amino acid tryptophan which is normally synthesized from raw materials using the enzyme tryptophan synthetase.if tryptophanis present in the growth medium, the bacteria will stop synthesizing tryptophan synthetase . Here, tryptophan is referred to as a corepressor. Tryptophan will combine with the repressor molecule which was originally inactive converting it to an active repressor molecule which will be able to combine with the operator gene, this will make the gene to be repressed or switched off, it will not stimulate the structural genes so no mRNA will be transcribed therefore no enzyme will be produced. When tryptophan is absent, the repressor molecule from the regulator gene remains in the inactive formand inthis form, it is unable to combine with the operator gene. So the operator gene remains switched on and therefore stimulates the structural gene,mRNA is then transcribed or for the production of mRNA. mRNA leads to the synthesis of a polypeptide which will lead to the productionof tryptophan synthetase
This protein is produced by a regulatory gene?
a repressor protein
How is flour produced and milled?
Check the link attached:
What blood disorder causes l-trytophan?
l-tryptophan is not a disorder-it is an amino acid used by some people to help them sleep! that being said, it can cause a type of blood disorder if it isn't properly produced
How does the function of free ribosomes differ from the function of ribosomes attached to other organelles?
Different proteins are produced on free-floating ribosomes than on ones attached to the rough endoplasmic reticulum (ER). In a general sense, proteins that will be used at the ER will be produced on attached ribosomes. Proteins that are meant for secretion will be made on free-floating ribosomes.
Dreams are produced by what?
Psychologically, dreams are produced by the subconscious mind, also referred to as the unconscious. Physiologically, dreams are produced by several different areas of the brain. See attached link for information from sleep studies.
Where is melatonin made?
Melatonin is made from the amino acid tryptophan. Tryptophan is an essential amino acid, that is, the body cannot make it; we need to get it through the foods we eat. Tryptophan is found in a wide variety of foods. As we consume tryptophan during the day, the body converts it into serotonin, an important brain chemical involved with mood. Serotonin, in turn, is converted into melatonin. This conversion occurs most efficiently at night.
Why is chicken meat?
It has similar texture and nutritional values, and is attached to the animal like beef. Other products like dairy and vegetables aren't physically attached to the animal itself but may be produced by the animal.
How many American children have cholesterol?
All of them. Cholesterol is a substance that is naturally produced in the body and is commonly attached to cellular membranes.
Is gross eye movements are produced by five extrinsic eye muscles attached to the outer surface of each eye?
yes they are, I studied this in college
What is an appressorium?
An appressorium is a bulbous formation produced by parasitic fungi which is attached to the cuticle of the host and from where a peg-shaped hypha is formed which penetrates the cuticle.
