2.6 past papers
Quiz by Dr. Reza M
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12 questions
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- Q1What is common to RNA and DNA?Nitrogenous basesHistonesDeoxyriboseThymine30s
- Q2Nucleic acids are polymers of nucleotides. What parts of nucleotides are joined together in both DNA and RNA to make these polymers?Pentose sugars with phosphatesNitrogenous bases with phosphatesNitrogenous bases with hexose sugarsLarge nitrogenous bases with small nitrogenous bases30s
- Q3For which discovery about DNA do Watson and Crick receive credit?DNA is the molecule that genes are made of.The shape of DNA is a double helix.The amount of adenine equals the amount of thymine in an organism.Phosphate–pentose bonding along the nucleotide backbone is covalent.30s
- Q4Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is based on DNA sequences and the cladogram on the right is based on comparing protein sequences. What is the reason that cladograms based on DNA sequences are more reliable predictors of the phylogenetic relationship of species than cladograms based on protein sequences?Amino acids are not as chemically stable as DNA nucleotides.DNA mutates but amino acids do not.There are 20 different amino acids but only 4 nucleotides.Several different triplets of bases can code for the same amino acid.30s
- Q5The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system. The graph shows the percentage of samples in which this bacterium showed resistance to six antibiotics over a period of ten years. What is a possible explanation for the total percentage resistance being larger than 100% in 2010?More people have been sampled in that year.People do not take the antibiotics as prescribed.Some bacteria are resistant to more than one antibiotic.There was an epidemic of Neisseria gonorrhoeae in that year.30s
- Q6What is a similarity between DNA and RNA?Both contain adenine, cytosine and thymine.Both are composed of antiparallel strands.Both are polymers of nucleotides.Both contain ribose sugar.30s
- Q7The diagram shows a molecular structure. Which type of molecule is shown?CarbohydrateAmino acidLipidNucleotide30s
- Q8What usually distinguishes DNA from RNA?ADCB30s
- Q9The diagram shows a dinucleotide. Which type of bond is identified by the arrow?CovalentHydrogenPeptidePhosphate30s
- Q10The image shows a DNA nucleotide.Which correctly identifies the parts labelled I and II?ABDC30s
- Q11Which sequence shows increasing relative size?ACBD30s
- Q12What is correct for the DNA double helix?DBAC30s
