Trp operon - Samenvattingen, Notities en Examens

Biology Chapter 18 Practice Test 44 Questions with Verified Answers In the case of E. coli, the bacterium may need to synthesize tryptophan, or its host, a human, may supply all the tryptophan it needs. Why do both bacteria and humans need tryptophan? A) It is an important enzyme in the glycolysis pathway. B) It is one of the 20 amino acids used by all organisms to synthesize proteins. C) It is an important constituent of cell walls in both humans and bacteria. D) Tryptophan induces the ...

LIFE 120 UNL Biology Practice Exam 4|33 Questions with Verified Answers Transcription in eukaryotes requires which of the following in addition to RNA polymerase? A) the protein product of the promoter B) ribosomes and tRNA C) aminoacyl synthetase D) start and stop codons E) several transcription factors (TFs) - CORRECT ANSWER E During splicing, which molecular component of the spliceosome catalyzes the excision reaction? A) RNA B) DNA C) protein D) sugar E) lipid - CORRECT ANSW...

Regulatory genes are genes whose products control the transcription or translation of other genes correct answer: True In bacterial operon, promoter is bound by regulator protein to regulate transcription correct answer: False A repressible gene should be under control by a repressor correct answer: False For a gene under negative control, the regulator protein is a repressor correct answer: True For a gene under positive inducible control, regulator protein is a activator and no...

Biology Exam 3 Practice Test 40 Questions with Verified Answers In the 1940s and 1950s scientists were performing experiments to discover what molecule was the inheritance material. The basis of that work was Griffith's transformation experiments with the rough and smooth strains of Pneumococcus. Rough bacterial strains were transformed by A. treatment with radiation. B. infection with a virus. C. uptake of protein from the environment. D. uptake of DNA from the environment. - CORRECT...

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...

Biochemistry Exam 3 Practice Tests 225 Questions with Verified Answers The complementary strand for the sequence 5' GCACTTCG 3' is - CORRECT ANSWER 5' CGAAGTGC 3' Polysomes...? (a) contain multiple mRNA's (b) contain multiple DNA's (c) contain multiple ribosomes (d) contain multiple RNA polymerases (e) a and c - CORRECT ANSWER (c) contain multiple ribosomes "Multiple ribosomes initiate on a SINGLE mRNA Polyribosomes or polysomes"- Ch 7 Proliferating cell nuclear ...

1 MCAT - BIO/BIOCHEM EXAM | QUESTIONS & ANSWERS (VERIFIED) | LATEST UPDATE | GRADED A+ defunct mRNA translation in bacteria would... Correct Answer: prevent cells from replicating. lysogenic cycle Correct Answer: a viral reproductive cycle in which the viral DNA is added to the host cell's DNA and is copied along with the host cell's DNA Lytic phase or lytic cycle Correct Answer: phage replicates immediately, destroying the host cell (All phages carry out this life cycle) prote...

MBB 331 MIDTERM EXAM 2 ANSWER KEY 100% CORRECT; Simon Fraser University MBB 331 MIDTERM EXAM 2 ANSWER KEY 100% CORRECT; Simon Fraser University

operon - ANSWER- A functional complex of genes encoding enzymes shared by a metabolic pathway. structural genes - ANSWER- code for the enzymes and are translated from a single polycistronic mRNA (encodes for more than one protein). promoter - ANSWER- Binding site for RNA polymerase -->transcription. operator - ANSWER- Binding site next to promoter where regulatory proteins bind repressor protein - ANSWER- binds a specific DNA sequence and determines whether or not a particular gene is ...

Brock Biology of Microorganisms - Chapter 6 Exam Questions With Correct Answers Protein-nucleic acid interactions - answerthese can be site-specific or nonspecific DNA-binding proteins - answer-small molecules that influence that binding of regulatory proteins to DNA -most interact with DNA in sequence-specific manner -specificity provided by interactions between aa side chains and chemical groups on bases and sugar-phosphate backbone of DNA -main site for binding is MAJOR GROOVE invert...