AQA A-level Biology paper 1 100% SOLUTION 2023//2024
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Module
AQA A-level Biology
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AQA A-level Biology
AQA A-level Biology
paper 1 100%
SOLUTION 2023//2024
Benedict's test - ANSWER Which food test is heated in a water bath?
Sucrose - ANSWER Which disaccharide is not a reducing sugar?
Test for non-reducing sugars - ANSWER Add acid. Neutralise. Add Benedicts. Heat.
Hydrolysis - ANSWER Reaction...
benedicts test answer which food test is heated in a water bath
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AQA A-level Biology
AQA A-level Biology
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AQA A -level Biology paper 1 100% SOLUTION 2023//2024 Benedict's test - ANSWER Which food test is heated in a water bath? Sucrose - ANSWER Which disaccharide is not a reducing sugar? Test for non -reducing sugars - ANSWER Add acid. Neutralise. Add Benedicts. Heat. Hydrolysis - ANSWER Reaction performed by dilute HCl in th e non reducing sugar test. Glucose + fructose - ANSWER During the non -reducing sugar test what is sucrose hydrolysed into? Alpha - ANSWER Which type of glucose makes up starch? amylose and amylopectin - ANSWER Names of two types of starch Amylose - ANSWER Coiled, compact form of starch. Stored easily. Amylopectin - ANSWER Branched form of starch. More easily hydrolysed. surface area - ANSWER Branched carbohydrates have a higher _____ for enzymes to work on. Glycogen - ANSWER Carbohydrate store in animals branched - ANSWER Glycogen is.... metabolic rate - ANSWER Glycogen is more branched than amylopectin because animals have a higher _____________ osmotically inactive. - ANSWER Starch is insoluble and therefore .... Beta - ANSWER What type of glucose is cellulose made from? Alpha and beta glucose - ANSWER H and OH swapped on Carbon 1. Fibrils - ANSWER Cellulose forms long chains called... H bonds - ANSWER Cellulose molecules are crosslinked by strength - ANSWER Cross linking of cellulose molecules gives them... Triglycerides - ANSWER _______ are a good source of energy because they have a high ratio of energy -storing carbon -hydrogen bonds what are the roles of lipids? - ANSWER 1. source of energy 2. waterproofing 3. insulation 4. protection how does the structure of phospholipids relate to their properties? - ANSWER 1. polar, therefore will position itself to form a bilayer 2. the structure allows them to form glycolipids by combining with carbohydrates within the cell -surface membrane. these are important in cell recognition. draw the structure of an amino acid - ANSWER draw how a dipeptide forms - ANSWER what is meant by 'primary sequence' of a protein - ANSWER The unique sequence of amino acids that mak e up a protein or polypeptide chain what is meant by 'secondary sequence' of a protein - ANSWER The way in which the primary structure of a polypeptide chain folds e.g. alpha helix or beta pleated sheets. shape is held by H bonds. what is meant by 'tertiary sequence' of a protein - ANSWER This is the overall 3 -D structure of the protein. The shape of the protein is held together by H bonds and ionic bonds and disulfide bridges.
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