Molecular Biology-מעבדה רפואית

Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA?

1

שאלה #54924

		met pro his met arg his tyr lys cys his thr
		met arg his tyr lys
		met arg his tyr lys cys his thr
		met arg his ser glu tyr tyr arg leu tyr ser

מיין לפי

Eden Barabi 1 נקודות · יותר מ-6 חודשים

מוניטין: 45

הרצף- 3'-CCUCAUAUGCGCCAUUAUAAGUGACACACA-חמש'

Matan Kandero 0 נקודות · יותר מ-6 חודשים

מוניטין: 5

תותחית שמדכאת אותי

Ran Unikel 0 נקודות · יותר מ-6 חודשים

מוניטין: 45

merci

The alanine aminoacyl tRNA synthetase enzyme of E. coli recognizes the alanine tRNA only by an unusual G:U base pair at position 70 in the stem of the tRNA. In the laboratory, you make a copy of the alanine tRNA gene that is identical to the wildtype copy except that the anicodon sequence 5' - IGC -3' is replaced with the sequence 5' - UCA -3'. You then add this mutant tRNA gene back into a wildtype E. coli. As a result,

1

שאלה #54925

		proteins will be truncated randomly at different alanine positions.
		nothing will change because the mutant tRNA will not function.
		all alanines in newly synthesized proteins will be replaced with serine.
		all proteins will be truncated at the first alanine position.
		some proteins will be longer than ususal.
		some alanines in newly synthesized proteins will be replaced with serine.

מיין לפי

In eukaryotes, the primary products of transcription of the rRNA genes first move to:

1

שאלה #55024

		the ribosomes
		the cytoplasm
		the nucleus
		the rough endoplasmic reticulum
		the nucleolus

מיין לפי

Ran Unikel 2 נקודות · יותר מ-6 חודשים

מוניטין: 45

שאלה חזקה ומלמדת מאוד,,,,,

You have identified a DNA element (A -top left) that you think affects transcription. To test its character you add A to sequence 5' to a poorly transcribed (+) DNA sequence (B) and then transfer the recombinant back into a test cell type. The locations and orientations of the added sequence and its effect on transcription () are shown in the diagram. A is:

1

שאלה #55025

		It is impossible to decide from the data.
		a promoter proximal element
		a transcription factor
		a core promoter element
		a promoter
		An enhancer

מיין לפי

Which one of the following is true of both prokaryotic and eukaryotic transcription?

1

שאלה #55026

		Both processes begin at promoters.
		Transcripts are capped and polyadenylated.
		Both processes occur in the nucleus.
		Both processes may exhibit rho dependent termination.
		Transcripts are often spliced.

מיין לפי

The sigma polypeptide of the prokaryotic transcription holoenzyme

1

שאלה #55027

		contains the 3’ to 5’ proofreading activity.
		determines the accuracy of transcription.
		binds to specific DNA sequences.
		is released from the polymerase holoenzyme after the first few nucleotides have been joined.
		is an elongation factor.
		catalyses phosphodiester bond formation.

מיין לפי

A mutation in the promoter sequence of a gene may:

1

שאלה #55028

		result in the production of an incomplete protein.
		increase the rate of transcription of the gene.
		None of these is correct.
		alter the rate of translation of the protein.
		affect the structure of the protein encoded by the protein.

מיין לפי

Ronen Borohov 1 נקודות · יותר מ-6 חודשים

מוניטין: 26

מוטציה על גבי הפרומוטור תוביל להאטה של השעתוק אך מנגד יכולה להוביל להאצה שלו

CCATACACACCCC GTGGTGAGAGGAC AACTTGTCTACAG GTTATAACAGTCT CGTTCGGCACAGG TCATTGACCTTTT ACCTTGACACAGA TAGTCGATACGCA ATATTGGCAAGGA These are nine sequences from the -35 regions of 9 typical prokaryotic promoters. Which one is most likely to contain the -35 concensus sequence?

1

שאלה #55029

		GTGGTGAGAGGAC
		GTTATAACAGTCT
		TAGTCGATACGCA
		CGTTCGGCACAGG
		ATATTGGCAAGGA
		AACTTGTCTACAG
		ACCTTGACACAGA
		TCATTGACCTTTT

היה מסיח נוסף לשאלה (לא ניתן להוסיף עוד אחד): CCATACACACCCC. התשובה הנכונה היא המסומנת.

מיין לפי

Which of the following tripeptides would be represented in polypeptides produced following the addition of the sequence (5'-GGCU)50 to a cell-free translation system?

1

שאלה #55038

		NH2-Gly-Trp-Gly
		NH2-Ala-Gly-Trp
		NH2-Ala-Gly-Ala
		NH2-Ser-Gln-Pro
		NH2-Trp-Gly-Ala

מיין לפי

An anticodon of human tyrosinyl-tRNA is 5'-GUA-3'. Which of the following is most likely to be a tyrosine codon?

1

שאלה #55039

		חמש'-UAC-שלוש'
		חמש'-CAA-שלוש'
		חמש'-AUG-שלוש'
		חמש'-GUA-שלוש'
		חמש'-CAU-שלוש'

בשאלה זה כמובן היה עם מספרים 3/5, פשוט אם כותבים עם מספרים זה משנה את הסדר של תוכן התשובה (:

נערך לפני 3 שנים Eden Barabi

מיין לפי

Matan Kandero 0 נקודות · יותר מ-6 חודשים

מוניטין: 5

לא ברור למה לא ההפך

Tevel Bruckner 0 נקודות · יותר מ-6 חודשים

מוניטין: 45

טעות גם לדעתי

Ran Unikel 0 נקודות · יותר מ-6 חודשים

מוניטין: 45

היי יקירה, שימי לב שRNA נקרא מ5' ל3'... לכן התשובה היא נכונה, ברכה והצלחה :)

Molecular Biology-מעבדה רפואית

Discuss, Learn and be Happy דיון בשאלות

Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA?

In eukaryotes, the primary products of transcription of the rRNA genes first move to:

Which one of the following is true of both prokaryotic and eukaryotic transcription?

The sigma polypeptide of the prokaryotic transcription holoenzyme

A mutation in the promoter sequence of a gene may:

CCATACACACCCC GTGGTGAGAGGAC AACTTGTCTACAG GTTATAACAGTCT CGTTCGGCACAGG TCATTGACCTTTT ACCTTGACACAGA TAGTCGATACGCA ATATTGGCAAGGA These are nine sequences from the -35 regions of 9 typical prokaryotic promoters. Which one is most likely to contain the -35 concensus sequence?

Which of the following tripeptides would be represented in polypeptides produced following the addition of the sequence (5'-GGCU)50 to a cell-free translation system?

An anticodon of human tyrosinyl-tRNA is 5'-GUA-3'. Which of the following is most likely to be a tyrosine codon?

בקשה לשינוי התשובה / תיקון שאלה gavel

בקשה למחיקת השאלהmood_bad

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