Synthesis of a repressible enzyme is stopped by. MICROBIOLOGY CH. 8 Flashcards 2022-10-29
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Synthesis of a repressible enzyme is the process by which the enzyme is produced and assembled within a cell. This process is regulated by various mechanisms, including the use of repressors, which are proteins that inhibit the transcription of genes encoding for the enzyme. In some cases, synthesis of a repressible enzyme may be stopped by the binding of a repressor to a specific DNA sequence known as the operator, which is located near the gene encoding for the enzyme.
One example of a repressible enzyme is the enzyme beta-galactosidase, which is involved in the metabolism of lactose in certain bacteria. In the absence of lactose, the repressor protein called LacI binds to the operator region of the DNA, preventing transcription of the beta-galactosidase gene. When lactose is present, it can bind to the LacI repressor, causing it to release from the operator and allowing transcription of the beta-galactosidase gene to proceed. This results in increased synthesis of beta-galactosidase, which can then break down lactose into glucose and galactose for use as energy sources by the cell.
In addition to repressor proteins, synthesis of a repressible enzyme may also be stopped by other regulatory mechanisms, such as the presence of certain small molecules or changes in the cell's environment. For example, certain hormones can bind to receptors on the cell's surface and signal the cell to alter its gene expression patterns, including the synthesis of specific enzymes.
Overall, the synthesis of a repressible enzyme is a complex and highly regulated process that is critical for maintaining the proper functioning of a cell. By understanding the mechanisms that control enzyme synthesis, scientists can gain insights into the regulation of cellular metabolism and potentially develop new strategies for manipulating gene expression for a variety of applications.
Synthesis of a repressible enzyme is stopped by A The corepressor binding to the
A DNA polymerase joins nucleotides in one direction only. Leucine-arginine-lysine-alanine Use Table 8. The ozone layer of the Earth has been depleted to an extent by human release of certain chemicals. If an indeterminate frameshift mutation occurred in the sequence of bases show below, what would be the sequence of amino acids coded for? Proline, histidine, methionine Use Table 8. DNA polymerase joins nucleotides in one direction 5' to 3' only. Refer to Table 8.
The secondary structure of the protein B. Identify the result of this DNA change in the mRNA codon that led to this change in the protein sequence. C two strands of identical nucleotides with hydrogen bonds between them. E RNA processing removes the different segments from the mRNA molecules of each person prior to translation. E Multiple replication forks are possible on a bacterial chromosome. The DNA polymerase is from Thermus aquaticus, and the template is from a human cell. UUU: Phenylalanine UAU: tyrosine If an indeterminate frameshift mutation occurred that is, one at a random location in the sequence of bases shown below, what would be the sequence of amino acids coded for?.
When the end product of the reaction that catalyzes the enzyme prevents its synthesis, this phenomenon is called negative induction. A the primary structure of the protein B the secondary structure of the protein C the tertiary structure of the protein D the quaternary structure of the protein E Cannot be determined Assume the two E. A leucine-arginine-lysine-alanine B asparagine-arginine-lysine-alanine C asparagine-cysteine-valine-serine D Translation would stop at the first codon. When a particular metabolite produced in a pathway suppresses or inhibits the production of an enzyme, the enzyme is known as repressible enzyme. The leading strand of DNA is made continuously Assume the two E. Repressible systems correspond to synthesis or anabolism processes, for example the tryptophan operon and the histine operon. E The answer cannot be determined based on the information provided.
What is the sequence of amino acids encoded by the following sequence of bases in a strand of DNA pay attention to the polarity of the DNA here? E None of the answers is correct. D DNA replication proceeds in one direction around the bacterial chromosome. Multiple replication forks are possible on a bacterial chromosome. C a mixture of human andT. The RNA product of a transcribed section of DNA. A DNA polymerase - makes a molecule of DNA from a DNA template B RNA polymerase - makes a molecule of RNA from an RNA template C DNA ligase - joins segments of DNA D transposase - cuts DNA backbone, leaving "sticky ends" E DNA gyrase - relaxes supercoiling in DNA ahead of the replication fork Which of the following statements is FALSE? A ampicillin, lysine, arginine B ampicillin, proline, histidine, methionine C lysine, arginine D proline, histidine, methionine E ampicillin, prolein, histidine, lysine By semiconservative model, a cell can produce exact copies of its DNA, reproducing all the necessary genes required for survival. The DNA synthesized would be most similar to a.
How Are Repressible Enzymes Different From Inducible Enzymes? NEET
If a frameshift mutation occurred in the sequence of bases shown below, what would be the sequence of amino acids coded for? D Mutations at the DNA level are not reflected in proteins produced. From this information you can conclude that chloramphenicol a. A They will both remain the same. Refer to Table 8. Ampicillin, lysine, arginine C. Refer to Table 8.
If the sequence of amino acids encoded by a strand of DNA is serine-alanine-lysine-leucine, what is the order of bases in the sense strand of DNA? B two complementary strands of nucleotides bonded A-C and G-T. The leading strand of DNA is made continuously. When a metabolite comes and inactivates the repressors, the genes are switched off. E The answer cannot be determined based on the information provided. Technically, the controller tryptophan , is called a corepressor, because it works with the repressor to block transcription, it is then a negative control mechanism. In said negative induction, the repressor is inactive, but in the presence of the corepressor it is activated acquires its functional capacity , and that is when it represses the structural operon.
How is the synthesis of a constitutive enzyme stopped?
A Thymine bases on the opposing DNA strands are covalently linked together to form a thymine dimer. A silent mutation B nonsense mutation C missense mutation D frameshift mutation When two genes from two different people are sequenced and aligned, it is discovered that there are multiple sequence differences in the coding segment DNA level. The DNA polymerase is fromThermus aquaticus, and the template is from a human cell. From this information you can conclude that chloramphenicol A prevents translation in eukaryotes. Which of the following statements is FALSE? How do constitutive enzymes differ from inductive enzymes? The leading strand of DNA is made continuously.
C Adenine and thymine bases on opposing DNA strands are linked together by hydrogen bonds. The DNA polymerase is from Thermus aquaticus and the template is from a human cell. E The answer cannot be determined based on the information provided. Proline, histidine, methionine D. Which of the following statements is FALSE? However, when the proteins formed by the genes have their amino acids sequenced, there is no difference observed between the two. A mixture of human and T.
synthesis of a repressible enzyme is stopped by the
The primary structure of the protein d. UUU: Phenylalanine UAU: tyrosine When amino acid sequences from a cell cycle control protein from a patient with cancer and a healthy person are aligned, the sequence from the cancer patient indicates one amino acid has changed from phenylalanine Phe to leucine Leu. DNA polymerase joins nucleotides in one direction only C. A mutation in the cancer patient's DNA must have taken place. E The answer cannot be determined based on the information provided. C The lagging strand of DNA is started by an RNA primer. C two strands of nucleotides running in an antiparallel configuration.
A DNA polymerase joins nucleotides in one direction only. D two strands of identical nucleotides in a parallel configuration with hydrogen bonds between them. B The mutations lie at locations where they don't affect protein sequence due to degeneracy of the genetic code. When a particular metabolite produced in a pathway further induces the production of an enzyme, the enzyme is known as inducible enzyme. When the controlling substance is attached to the repressor molecule, it sticks to the promoter, preventing the transcription of the gene, and therefore, turning it off, the compound that prevents the synthesis of the enzyme is called a co-repressor. A the primary structure of the protein B the secondary structure of the protein C the tertiary structure of the protein D the quaternary structure of the protein E The answer cannot be determined based on the information provided. The trp operon is an example of the genetic regulation of repressible enzymes, because the presence of the product of the metabolic pathway represses or inhibits the synthesis of the enzymes necessary to synthesize it.
