2.7 past papers
Quiz by Dr. Reza M
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22 questions
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- Q1Research has shown that the genetic code is not entirely universal. Which research finding has shown this?Some codons code for the addition of an amino acid and some code for the termination of translation.Some amino acids are coded for by more than one codon.In some organisms the genetic code for mitochondria differs from the genetic code for the nucleus.There are differences between the base sequences of genes in different species.30s
- Q2This is a sequence of nucleotides from a section of mRNA. AUGAAACGCACGCAG From which DNA sequence has it been transcribed?TACUUUGCGTGCGTCATGAAACGCACGCAGUACUUUGCGUGCGACTACTTTGCGTGCGTC30s
- Q3How is the information in the genetic code used?To distinguish prokaryotic genomes from eukaryotic genomesTo predict the genotype of gametesTo translate mRNA into polypeptidesTo deduce phenotypes in pedigree charts30s
- Q4What is required to replicate DNA?PlasmidsEndonucleaseFree nucleotides carrying A, C, G and T basesTemperature of 37 °C30s
- Q5What is required to replicate DNA?PlasmidsEndonucleaseFree nucleotides carrying A, C, G and T basesTemperature of 37 °C30s
- Q6Which sequence represents the order of events in protein synthesis?ADCB30s
- Q7Which model represents transcription?ADCB30s
- Q813N.1.HL.TZ0.11 [1 mark] A base substitution in a gene has changed a codon. Which of these consequences could result from a base substitution in a codon? I. Another amino acid will be incorporated in the protein II. A stop codon is generated III. The same protein will be synthesizedI and III onlyI and II onlyI onlyI, II and III30s
- Q9The gene that codes for a particular polypeptide includes the base sequence shown. GAGTACCCT What is the base sequence of the mRNA molecule which is complementary to this sequence?GUGTUCCCTCUCAUGGGACTCATGGGAGAGTACCCT30s
- Q10The base sequences of a short section of DNA are shown, together with mRNA that has been transcribed from it and one of the tRNA anticodons that could be used to translate the mRNA. Which strand of DNA is transcribed and to which codon in the mRNA would the tRNA anticodon bind during translation?DCAB30s
- Q11Where are amino acids joined together to make polypeptides?Golgi apparatusNucleusRibosomesNucleolus30s
- Q12The table shows some codons for five amino acids. Which of these DNA strands will code for the amino acid sequence glycine-serine-glycine?CCTTCGCCGCCUUCGCCGCCUUCGCCUGGAAGCGGA30s
- Q13What do DNA replication, transcription and translation have in common?Catalysed by polymeraseComplementary base pairingRequire free nucleotidesTake place in cell nucleus30s
- Q14Some yeast genes can be replaced by human genes that then continue to produce the same human proteins in the yeast cells. Which statement helps to explain this evidence?Yeast and humans are both eukaryotes.Yeast and humans have the same number of chromosomes.The DNA of yeast and humans is identical.The genetic code is universal.30s
- Q15What do DNA replication, transcription and translation have in common?Take place in cell nucleusCatalysed by polymeraseRequire free nucleotidesComplementary base pairing30s
