What is the operon hypothesis?
What is the operon hypothesis?
The Operon Hypothesis. Sounds like a Jason Bourne movie, but actually a theory about control of gene activity. In bacteria many genes have an “operator” region downstream of the promoter which affects transcription. The promoter is the region that binds the RNA polymerase.
Which is an arrangement of genes consisting of an operator a promoter and a repressor?
An operon is an arrangement of genes consisting of an operator, a promoter, and a repressor. It is a functioning unit of DNA which contains cluster of genes controlled only by a single promoter.
What is the purpose of the peptide bond that is shown in the diagram quizlet?
What is the purpose of the peptide bond that is shown in the diagram? it connects amino acids.
Which is composed of amino acids and determines all the structures and functions of organism?
Protein is composed of amino acids and determines all the structures and functions of organisms. Proteins are large macromolecules and are essential nutrients for the human body.
What factors helps distinguish one amino acid from another?
What distinguishes one amino acid from another? each amino acid has a central carbon (alpha carbon) attached to an amino group, a carboxyl group, a hydrogen and an R group. The R group has a different structure for each amino acid.
Which amino acid does not have an ionizable side chain?
amino acid glycine
What does it mean to have an ionizable side chain?
Ionizable Amino Acids. Seven out of the twenty amino acids contain readily ionizable side chain groups. That means that at specific pH values, each side chain can participate in an acid-base reaction in which it can exchange a hydrogen atom with some other biomolecule.
What is the side chain of glutamate?
Two amino acids have acidic side chains at neutral pH. These are aspartic acid or aspartate (Asp) and glutamic acid or glutamate (Glu). Their side chains have carboxylic acid groups whose pKa’s are low enough to lose protons, becoming negatively charged in the process.
What is the side chain of histidine?
6
At what pH is histidine protonated?
approximately 6.0
What does histidine do in the body?
Histidine is an amino acid. Amino acids are the building blocks of protein in our bodies. People use histidine as medicine. Histidine is used for rheumatoid arthritis, allergic diseases, ulcers, and anemia caused by kidney failure or kidney dialysis.
Is histidine essential for adults?
Rose’s later work showed that eight amino acids are essential for adult human beings, with histidine also being essential for infants. Longer-term studies established histidine as also essential for adult humans.