11751200
Descrição
Quiz por Christina Marshall, atualizado more than 1 year ago
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Criado por Christina Marshall
quase 7 anos atrás
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Questão 1
Questão
Which of the following best represents the central dogma of gene expression?
Responda
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During transcription, DNA codes for polypeptides.
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During transcription, DNA codes for mRNA, which codes for polypeptides during translation
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During translation, DNA codes for mRNA, which codes for polypeptide during transcription
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none of the above
Questão 2
Questão
A mutation prevents a gene from being transcribed into an mRNA. The mutation most likely disrupts
Responda
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the promoter
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the terminator
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the start codon
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the stop codon
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both a and c
Questão 3
Questão
The functional product of a structural gene is
Responda
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tRNA
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mRNA
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rRNA
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a polypeptide
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a, b, and c.
Questão 4
Questão
Which of the following is not a property of the genetic code?
Responda
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It specifies the amino acids within a polypeptide
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It is composed of codons, which are specific sequences of three bases.
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It has a start codon, which specifies the starting point for polypeptide synthesis.
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It has stop codons, which specify the end of polypeptide synthesis,
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It determines the rate of transcription.
Questão 5
Questão
If a eukaryotic mRNA failed to have a cap attached to it 5' end, what would the negative consequence(s) be?
Responda
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The mRNA would not properly exit the nucleus
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The mRNA would not properly bind to a ribosome
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The mRMA would not receive a Poly A tail.
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The mRNA would not use the correct start codon.
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Both a and b are correct
Questão 6
Questão
The small subunit of a ribosome is composed of
Responda
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a protein
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an rRNA molecule
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many proteins
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many rRNA molecules
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many proteins and one rRNA molecule
Questão 7
Questão
The part of a tRNA that is complementary to a codon in an mRNA is the
Responda
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acceptor stem
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codon
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peptidyl site
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anticodon
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adaptor loop
Questão 8
Questão
During the initiation of translation, the first codon, ________, enters the ___________ and associates with the initiator tRNA.
Responda
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UAG, A site
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AUG, A site
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UAG, P site
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AUG, P site
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AUG, E site
Questão 9
Questão
The movement of the polypeptide from the tRNA in the P site to the tRNA in the A site is referred to as
Responda
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peptide bonding
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aminoacyl binding
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translation
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the peptidyl transfer reaction
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elongation
Questão 10
Questão
During which stage of translation does the synthesis of a polypeptide occur?
Responda
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initiation
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elongation
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termination
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splicing
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