The lac repressor is - Study guides, Class notes & Summaries

BIO 13 Practice Test 40 Questions with Verified Answers RNA contains the sugar a. ribose. b. deoxyribose. c. glucose. d. lactose. - CORRECT ANSWER a. ribose. Unlike DNA, RNA contains a. adenine. b. uracil. c. phosphate groups. d. thymine. - CORRECT ANSWER b. uracil. Which of the following are found in both DNA and RNA? a. ribose, phosphate groups, and adenine b. deoxyribose, phosphate groups, and guanine c. phosphate groups, guanine, and cytosine d. phosphate grou...

MHC II Proteins are found on what type of cells? Professional Antigen Presenting Cells Molecular Koch's Postulate are important for identifying: A gene involved in virulence Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen Based on what we've discussed, why do you think you are supposed to get a flu shot each year? -Epitopes of flu strains are highly variable on an animal basis -No cross protection ...

TAMU bio 111 lab exam 2 review (2023/2024) already passed What is the difference between the coding and non-coding region? Coding region: comprised of genes that encode proteins (instructions that determine traits) and makes up 1-2% of human DNA. • Noncoding region: makes up 98-99% of human DNA, contains STRs and is responsible for regulatory functions such as gene transcription. What are STRs? Short-tandem repeats (STRs) are unique repeating patterns of the same nucleotide sequence. They can ...

Bio 101 Chapter 7 Exam Questions and Answers All Correct A change in a cell's DNA sequence is Select one: a. transcription. b. a mutation. c. an operon. d. translation. e. replication. - Answer-b. a mutation A diploid cell only has two copies of most genes, but can make hundreds of copies of a protein from those genes per second because Select one: a. while transcription can repeat and make multiple mRNA copies of genes, and multiple ribosomes can translate the same mRNA. b. mul...

BSC2010 Ch.11 Study Exam Questions Correctly Answered. In the _____ of lactose, the lac ____ binds to the lac _____ site - CORRECT ANSWER absence; repressor; operator Refer to the figure below. A mutant E. coli cell expresses z, y, and a genes at the same levels in the presence and absence of lactose. These levels correspond to those observed in wild-type E. coli cells in the presence of lactose. Which region of the DNA shown in the figure could contain the mutation? - CORRECT ANSWER i ...

Ap Bio Chapter 18 Practice Test 99 Questions with Verified Answers The role of a metabolite that controls a repressible operon is to - CORRECT ANSWER e) bind to the repressor protein and activate it The tryptophan operon is a repressible operon that is - CORRECT ANSWER E) turned off whenever tryptophan is added to the growth medium. Which of the following is a protein produced by a regulatory gene? - CORRECT ANSWER D) repressor A lack of which molecule would result in the cell's ina...

FRNSC 420 - EXAM 4 PRACTICE QUESTIONS AND ANSWERS (100% PASS) positive allosteric regulation - Answer️️ -binding of a regulatory molecule to an enzyme induces a conformation change, increasing the enzyme's affinity for a substrate - proteins are activators = enhance RNAP binding and/or induce conformational change, can change binding constant (KB) or rate constant (kf), lowers activation energies negative allosteric regulation - Answer️️ -bound regulatory molecule must release ...

USLME – Biochemistry Exam Questions With Accurate Answers. Amino acids necessary for purine synthesis - answerGlycine Aspartate Glutamine Leflunomide MOA - answerinhibits dihydroorotate dehydrogenase 5-fluorouracil and capecitabine (its prodrug) MOA - answerForm 5-F-dUMP which inhibits thymidylate synthase (therefore decreasing dTMP) Adenosine deaminase deficiency (Pathogenesis, presentation) - answerADA needed for degradation of adenosine Deficiency causes: excess ATP and dATP --&gt...

What are the necessary requirements for high levels of transcription for the lac operon? High Lactose, low glucose, low cAMP Low Lactose, high glucose, high cAMP High Lactose, low glucose, high cAMP High Lactose, high glucose, low cAMP - Answer- High Lactose, low glucose, high cAMP Which of the following statements is/are correct regarding the 10 promoter from bacteriophage T7? When IPTG is added, it inhibits the lac repressor In the absence of IPTG, the lac repressor repres...

Coupled transcription and translation - Ribosomes bind mRNA while mRNA is still being created, so that translation begins while transcription is still occurring - Advantage of lacking a nucleus Translation initiation - - Initiation factors bind ribosome to the ribosome binding site known as the Shine Delgarno sequence (AGGAGG) - Begins at start codon 1. 30s subunit binds mRNA 2. IF2 interacts with initiator tRNA 3. fMet-tRNA binds to start codon 4. Association of initiator tRNA with ...