
Protein synthesis
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38 questions
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- Q1What is DNA like in prokaryotic cells?A double helix structure, DNA molecules in eukaryotes are longer, linear and are associated with protein molecules called histones forming chromosomes. DNA molecules are really long so it is coiled up very tightly around histones in order to fit in cells. Eukaryotic DNA is composed mainly of introns. The mitochondria and chloroplasts in eukaryotes also have DNA – however their structure is like that of DNA in prokaryotes: short, circular and not associated with proteins.Short single circular strands of DNA which are not associated with proteins. Prokaryotes have a single circular chromosome, it is supercoiled to fit in the cell. Prokaryotic DNA is made up predominantly of exons. Some prokaryotes may have at least one portion of DNA called plasmid DNA.45s
- Q2What is a histone?The proteins which interact with the DNA and DNA coils around to form chromosomes.The proteins which interact with the RNA and DNA coils around to form chromosomes.45s
- Q3What is a homologous chromosome?Pairs of matching chromosomes (one maternal and one paternal) are called homologous chromosomes. Both chromosomes in each pair are the same size but have different gene loci but may have different alleles.Pairs of matching chromosomes (one maternal and one paternal) are called homologous chromosomes. Both chromosomes in each pair are the same size and have the same gene loci but may have different alleles.45s
- Q4What is a gene?A gene is a sequence of DNA bases that contains the coded information for making polypeptides and functional DNA. Polypeptides make up proteins so genes determine the proteins of an organism.A gene is a sequence of DNA bases that contains the coded information for making polypeptides and functional RNA. Polypeptides make up proteins so genes determine the proteins of an organism.45s
- Q5What is a triplet?In the DNA molecules, every three bases codes for two amino acids (AA) – this is referred to as a triplet.In the DNA molecules, every three bases codes for one amino acid (AA) – this is referred to as a triplet.45s
- Q6What are exons?Sections of genes which do not code for amino acids are called introns. These are removed during protein synthesis. Prokaryotic DNA does not have introns.Sections of genes which code for amino acids are called exons.45s
- Q7What are introns?Sections of genes which do not code for amino acids are called introns. These are removed during protein synthesis. Prokaryotic DNA does not have introns.Sections of genes which code for amino acids are called exons.45s
- Q8What is a locus?The position at which an allele is located on a gene.The position at which a gene is located on a DNA molecule.45s
- Q9Why is DNA referred to as a ‘degenerate code’?There are only 64 AAs but 20 possible triplets. DNA is referred to as a degenerate code because some AAs are coded for by more than one triplet.There are only 20 AAs but 64 possible triplets. DNA is referred to as a degenerate code because some AAs are coded for by more than one triplet.45s
- Q10What is an allele?Alleles are different versions of a gene. The order of bases are slightly different leading to slightly different versions of the same polypeptide.Alleles are different versions of a gene. The order of genes are slightly different leading to slightly different versions of the same polypeptide.45s
- Q11Why is the genetic code referred to as ‘universal’?All organisms use DNA to store genetic information and the same base triplets code for the same genes.All organisms use DNA to store genetic information and the same base triplets code for the same AAs.45s
- Q12Why is the genetic code referred to as ‘non-overlapping’?Each base is part of one triplet code. Adjacent triplets do not overlap.Each base is part of one triplet code. Adjacent triplets do overlap.45s
- Q13What is a spliceosome?A structure made from small nuclear RNA which splices (removes) the introns on the pre-mRNA to form mRNA.A structure made from small nuclear RNA which splices (removes) the exons on the pre-mRNA to form mRNA.45s
- Q14What is a genome?The complete set of genes in a cell of an organism is called the genome.The complete set of genes in a cell of an organism is called the genotype.45s
- Q15What is a codon?The three bases which code for an AA on an mRNA molecule is called a anticodon.The three bases which code for an AA on an mRNA molecule is called a codon.45s