32. what level of regulation is controlled the operon of tryptophan? A) at repli

Question

32. what level of regulation is controlled the operon of tryptophan?

A) at replication
B) at transcription
C) at the processing of mRNA
D) level and translation
E) level post-translation

33. how many genes structural are involved in the synthesis of tryptophan?

A) one
B) two
C) three
D) four
E) five

34. genes encoding for enzymes involved in journeys metabolic _______ are normally off in the presence of the final product:
A) simple
B) anabolism (biosynthesis)
C) complex
D) catabolism (degradation)
E) mutant

35. body in which I postulate model operon: A) phage t4
B) Escherichia coli
C) phage Lambda
D) salmonella thyphimorium
E) Drosophila melanogaster

36. researchers postulated the pattern operon of lactose in E. coli:

A) Darwin and Wallace
B) Jacob and monod
C) Watson and Crick
D) Hershey and Chase
E) Avery, McLeod and Mc carthy

37. what parts of the operon not transcribed?

A) genes structural
B) the operator
C) Gene regulatory
D) the promoter
E) B and D

38. what is the main difference between a operon bacterial and one eukaryotic?

A) the operon eukaryotic is monocistronico and prokaryotic is policistronico
B) the operon eukaryotic doesn't have genes structural and prokaryotic if
C) RNA polymerase recognizes the operones prokaryotes, but is not able to recognize them in eukaryotes
D) in prokaryotes the Gene regulatory this about genes structural, but in eukaryotes the Gene regulatory this outside the operon
E) none of the previous

39. what types of genes are expressed continuously and are not covered by a operon?
A) genes adaptive
B) introns
C) genes constituent (housekeeping genes)
D) genes enzyme
E) B and D

40. which (is) of the following is (are) levels regulation in prokaryotes?
A) transcript
B) processing of mRNA
C) stability of the mRNA
D) translation E) all previous

41. females of mammals compensation doses occurs by:

A) hipoactivación Gene in both chromosomes X
B) inactivation of a chromosome X
C) hiperactivación chromosome X in males
D) acetylation of both chromosomes X
E) none of the previous

42. regulation of Gene expression in eukaryotes occurs in the following levels:

A) transcript
B) post transcript
C) translation
D) post translation
E) all previous

43. Esther is analyzing the DNA of a group of organisms eukaryotic and found a regions nucleotide highly metiladas; the most likely explanation for this finding is:

A) that are regions of regulation
B) is Associated with suppressed transcriptional
C) are areas induction by catabolito
D) are areas that are transcribed, but not translate
E) are receptors for hormones

44. how denomin to the set of changes physical and chemical transform a protein newly synthesized in a protein biologically active?
A) protein synthesis
B) modification post transcriptional
C) modification post traduccional
D) initiation
E) termination

Explanation / Answer

32. A) at transcription. Transcription of genes are performed due to activation of trp operon. RNA polymerase is able start transcription when tryptophan is present and interacts with repressor protein to block operator.

33. E) five. five structural genes of trp operon: trp E, trp D, trp C, trp B, and trp A.

34. B) anabolism (biosynthesis). trp operon is off when tryptophan is present since no biosynthesis of tryptophan is required.

35. B) Escherichia coli.

36. B) Jacob and mood.

37. E) B and D.

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