AQA A LEVEL BIOLOGY Study guides, Class notes & Summaries

aqa a level physics paper 1 EXAM Questions and Answers (2023/2024) (Verified Answers)

AQA A-Level Biology Questions with Answers | Graded A Glucose is absorbed from the lumen of the small intestine into epithelial cells. Explain how the transport of sodium ions is involved in the absorption of glucose by epithelial cells. (5 marks) [Unit 1, June 16] - Correct Answer ️️ -1. Na+ ions leave epithelial cell and enter blood; 2. (Transport out is by) active transport / pump / via carrier protein using ATP; 3. So, Na+ conc. in cell is lower than in lumen (of gut); 4. Sodium/N...

what is RNA? - correct answer ribonucleic acid MRNA and TRNA single stranded shorter AU CG what are biological molecules? - correct answer molecules made and used by living organisms eg. lipids, carbs, DNA, AT, water, inorganic ions what are the functions of carbohydrates? - correct answer -energy source (respiration) -energy store (starch and glycogen) -structure (cellulose) ATP structure? - correct answer 1 adenosine 3 phosphates ADP and energy= ATP condensation reaction using...

Describe how you would use a biochemical test to show that a solution contained a non-reducing sugar, such as sucrose. [3] - correct answer ,first reducing sugars test; boil with dilute HCl acid then Neutralise with NaHCǑ, add benedict and heat to 95 degrees C brick red ppt forms if reducing sugar is present Describe a chemical test you could carry out to show that a piece of coconut contains lipids. [3] - correct answer (Crush in) ethanol / alcohol; Add (to) water (Order of adding is critic...

AQA A-Level Biology Exchange Surfaces with Questions and Answers What is the 'surface area' of an organism? ANSWER - the total surface over which substances and heat can be exchanged What is the 'volume' of an organism? ANSWER - this determines the number of substances that need to be taken in and transported out - as the volume increases, more materials are needed for metabolism because there are more cells What is the relationship between surface area and volume in an organism? A...

AQA A Level Biology-Genome Projects and Gene Technologies Test with Q & A What is a genome? ANSWER The entire set of DNA (including all the genes) in an organism. What must you do to DNA before sequencing the entire genome of an organism? ANSWER Break the DNA into smaller fragments as the gene sequencing methods only work on smaller sections of DNA. Each fragment is sequenced and placed back in order to give the correct whole genome. What was the Human Genome Project? ANSWER The sequ...

AQA A Level Biology-Biological Molecules Exam with Q & A Graded A Plus Define a monomer? ANSWER ~ one of many small molecules that combine to form a larger one known as a polymer Define a polymer? ANSWER ~ large molecule made up of repeating smaller molecules(monomer) 4 examples of monomers? ANSWER ~ Monosaccharides- Glucose, galactose ~ Nucleotides ~ amino acid ~ fatty acid or glycerol Define a hydroylsis reaction? ANSWER ~ the breaking down of large molecules into smaller...

AQA A level Biology Scholar Overview Exam with Latest Questions & Accurate Answers-2024 Describe how you would use a biochemical test to show that a solution contained a non-reducing sugar, such as sucrose. [3] ANSWER ,first reducing sugars test; boil with dilute HCl acid then Neutralise with NaHCǑ, add benedict and heat to 95 degrees C brick red ppt forms if reducing sugar is present Describe a chemical test you could carry out to show that a piece of coconut contains lipids. [3] ANSWER...

AQA A-LEVEL BIOLOGY EXAM 150 QUESTIONS & CORRECT VERIFIED ANSWERS |GUARANTEED A+ SCORE: LATEST UPDATE 1

What is a dominant allele? Allele which is always expressed in the phenotype even when theres only one copy of it What are recessive alleles? Alleges that only appear in the phenotype if 2 copies are present What are codominant alleles? Alleles that are both expressed in the phenotype because neither one is recessive If an organism carries two copies of the same allele it said to be ........ Homozygous at the locus If an organism carries two different alleles it is said to be...... Hetero...

What are the 2 main types of organism? Eukaryotes and prokaryotes What cells are eukaryotic? Animal, plant, algal, fungal Name the 11 organelles in an animal cell 1. Cell surface membrane 2. Rough endoplasmic reticulum 3. Smooth endoplasmic reticulum 4. Lysosome 5. Ribosome 6. Golgi apparatus 7. Mitochondria 8. Nuclear envelope 9, nucleolus 10. Nucleus 11. Cytoplasm