Biology > As Level Question Papers > OCR AS LEVEL JUNE 2022 BIOLOGY A PAPER 1 QUESTION PAPER (All)
OCR AS LEVEL JUNE 2022 BIOLOGY A PAPER 1 QUESTION PAPER
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AS Level Biology A H020/01 Breadth in biologyThe graph below shows the results of an osmosis experiment investigating the effect of changing the concentration of sodium chloride (NaCl) on mass of po... tatoes.The reaction between carbon dioxide and water forms carbonic acid. This reaction is catalysed by the enzyme carbonic anhydrase. To catalyse this reaction, carbonic anhydrase needs a cofactor that attaches to its active site as a prosthetic group.The table shows the numbers of different species of invertebrates found in four different areas in a woodland.The table shows the chemical symbols for some inorganic ions involved in biological processes. Ammonium ion Calcium ion Nitrate ionWhich row gives the correct chemical symbols for all of these inorganic ions?Researchers have calculated that the probability of bacterial DNA having a mutation is 1 / 333 in a single division. A gene has DNA that codes for amino acids and is called coding DNA. The rest of the DNA in a genome has base sequences that do not code for amino acids and is called non-coding DNA. Bacterial genome studies have shown that the average proportion of a bacterial genome that has non-coding DNA is 3 / 25. What is the probability of a dividing bacterium having a mutation in a gene that codes for a protein in a single division? A 1 / 2775 B 22 / 8325 C 1024 / 8325 D 7351 / 8325 Your answer Restriction endonucleases are a group of enzymes that carry out hydrolysis reactions that cut long DNA molecules into shorter lengths. Which of the options describes how restriction endonucleases carry out hydrolysis reactions on a DNA molecule? A They break the glycosidic bond between a ribose and a phosphate group. B They break the hydrogen bonds between nitrogenous bases. [Show More]
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