1 Exam (elaborations) A-level Biology Edexcel Midterm Exam Questions Solved Correctly 2024. 2 Exam (elaborations) A level Edexcel Biology Comprehensive Exam Fully Solved 2024. 3 Exam (elaborations) A Level Edexcel Biology Midterm Exam Questions And Answers Graded A 2024. 4 Exam (elaborations) A...
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A sequence of changes in a community Over a period of time - Answer Define Succession Final stage Stable - Answer Define Climax community Thylakoids made of membranes Arranged as grana Contain chlorophyll Arranged as photosystems Membranes contain ATPase Electron carriers associated...
Voorbeeld 3 van de 22 pagina's
In winkelwagenA sequence of changes in a community Over a period of time - Answer Define Succession Final stage Stable - Answer Define Climax community Thylakoids made of membranes Arranged as grana Contain chlorophyll Arranged as photosystems Membranes contain ATPase Electron carriers associated...
Topic 1 - Answer Biological Molecules Name the type of chemical reaction that joins monosaccharides together to form an amylose molecule. - Answer condensation reaction Describe the meaning of the term hydrolysis. - Answer breaks bonds via the addition of water Describe one structu...
Voorbeeld 3 van de 16 pagina's
In winkelwagenTopic 1 - Answer Biological Molecules Name the type of chemical reaction that joins monosaccharides together to form an amylose molecule. - Answer condensation reaction Describe the meaning of the term hydrolysis. - Answer breaks bonds via the addition of water Describe one structu...
Describe the events of fertilisation that occur after the acrosome reaction. - Answer -Membrane of sperm and egg cell fuse together -cortical granules release contents into zona pellucida -Zona pellucida thickens -Haploid nuclei fuse Explain how phospholipids form a cell surface membrane ...
Voorbeeld 3 van de 24 pagina's
In winkelwagenDescribe the events of fertilisation that occur after the acrosome reaction. - Answer -Membrane of sperm and egg cell fuse together -cortical granules release contents into zona pellucida -Zona pellucida thickens -Haploid nuclei fuse Explain how phospholipids form a cell surface membrane ...
What is the purpose of having a heart and circulation? - Answer Moving substances around the body Why do larger organisms need a mass transport system, not an open circulatory system? - Answer Larger diffusion distances: slower transport of substances Why is water a good transport medium...
Voorbeeld 2 van de 7 pagina's
In winkelwagenWhat is the purpose of having a heart and circulation? - Answer Moving substances around the body Why do larger organisms need a mass transport system, not an open circulatory system? - Answer Larger diffusion distances: slower transport of substances Why is water a good transport medium...
What is a nucleotide? - Answer Nitrogen base + sugar (ribose or deoxyribose) and phosphate group joined by a condensation reaction with TWO water molecules released. What is the role of a nucleotide? - Answer - provide the building blocks for the mechanism of inheritance in the form of DNA ...
Voorbeeld 2 van de 7 pagina's
In winkelwagenWhat is a nucleotide? - Answer Nitrogen base + sugar (ribose or deoxyribose) and phosphate group joined by a condensation reaction with TWO water molecules released. What is the role of a nucleotide? - Answer - provide the building blocks for the mechanism of inheritance in the form of DNA ...
Describe what is meant by biodiversity. (2) - Answer Variety of species in an ecosystem and the variety of alleles in a gene pool. Explain how the biodiversity of lemurs in two different parts of Madagascar could be compared. (3) - Answer Record total number of species of lemur and total indi...
Voorbeeld 1 van de 3 pagina's
In winkelwagenDescribe what is meant by biodiversity. (2) - Answer Variety of species in an ecosystem and the variety of alleles in a gene pool. Explain how the biodiversity of lemurs in two different parts of Madagascar could be compared. (3) - Answer Record total number of species of lemur and total indi...
Molecular phylogeny - Answer It compares the structure of a particular molecule from different organisms to discover their degree of evolutionary relation. Somatic cell - Answer A cell in an organism which isn't a gamete. DNA - Answer Deoxyribose nucleic acid. Carries the genetic inf...
Voorbeeld 2 van de 7 pagina's
In winkelwagenMolecular phylogeny - Answer It compares the structure of a particular molecule from different organisms to discover their degree of evolutionary relation. Somatic cell - Answer A cell in an organism which isn't a gamete. DNA - Answer Deoxyribose nucleic acid. Carries the genetic inf...
monosaccharides - Answer single simple sugar molecule disaccharides - Answer sugar made up off two monosaccharide units joined by a glycosidic bond formed in a condensation reaction polysaccharides - Answer polymer made up of long chains of monosaccharide units joined by glycosidic bo...
Voorbeeld 3 van de 16 pagina's
In winkelwagenmonosaccharides - Answer single simple sugar molecule disaccharides - Answer sugar made up off two monosaccharide units joined by a glycosidic bond formed in a condensation reaction polysaccharides - Answer polymer made up of long chains of monosaccharide units joined by glycosidic bo...
Name 3 ways in which carbohydrates are useful - Answer 1. Energy store 2. Energy source 3. Cellulose (structure) What are all carbohydrates made up of? - Answer Carbon, hydrogen, oxygen What are the three main groups of carbs? - Answer Monosaccharides Disaccharides Polysaccharides ...
Voorbeeld 2 van de 5 pagina's
In winkelwagenName 3 ways in which carbohydrates are useful - Answer 1. Energy store 2. Energy source 3. Cellulose (structure) What are all carbohydrates made up of? - Answer Carbon, hydrogen, oxygen What are the three main groups of carbs? - Answer Monosaccharides Disaccharides Polysaccharides ...
Which 5 factors are used to determine the time of death of a mammal? - Answer • Extent of decomposition • Stage of succession • Forensic entomology • Body temperature • Degree of muscle contraction. Describe the stages of decomposition. - Answer 1) Autolysis occurs - Enzymes in...
Voorbeeld 3 van de 19 pagina's
In winkelwagenWhich 5 factors are used to determine the time of death of a mammal? - Answer • Extent of decomposition • Stage of succession • Forensic entomology • Body temperature • Degree of muscle contraction. Describe the stages of decomposition. - Answer 1) Autolysis occurs - Enzymes in...
Fixed Joint -Answer Skull joint that does not move. Cartilage Joint -Answer Rib joint that does not move. Synovial Joint -Answer A moveable joint which is encased in synovial fluid with cartilage padding at the bone end. E.g. Knees or elbows. Ligament -Answer Connects bone to bone. ...
Voorbeeld 2 van de 7 pagina's
In winkelwagenFixed Joint -Answer Skull joint that does not move. Cartilage Joint -Answer Rib joint that does not move. Synovial Joint -Answer A moveable joint which is encased in synovial fluid with cartilage padding at the bone end. E.g. Knees or elbows. Ligament -Answer Connects bone to bone. ...
The gradual, directional change of a community over time, during which the organisms within an ecosystem change the conditions to allow better adapted organisms to colonise the area, replacing it's current inhabitants. - Answer Succession Occurs in a completely lifeless habitat - Answer Prim...
Voorbeeld 2 van de 5 pagina's
In winkelwagenThe gradual, directional change of a community over time, during which the organisms within an ecosystem change the conditions to allow better adapted organisms to colonise the area, replacing it's current inhabitants. - Answer Succession Occurs in a completely lifeless habitat - Answer Prim...
A water molecule has an unequal distribution of charge. It is therefore described as being...? - Answer Polar What is a molecule with empirical formula CH2O called? - Answer Carbohydrate Hexose sugar - Answer Mono-saccharide containing six carbon atoms Mono-saccharide - Answer simpl...
Voorbeeld 2 van de 6 pagina's
In winkelwagenA water molecule has an unequal distribution of charge. It is therefore described as being...? - Answer Polar What is a molecule with empirical formula CH2O called? - Answer Carbohydrate Hexose sugar - Answer Mono-saccharide containing six carbon atoms Mono-saccharide - Answer simpl...
a concept that defines cells as a fundamental unit of structure, function and organisation in all living organisms. - Answer Cell theory a tough outer layer which surrounds some cell types and is made of peptidoglycan in bacteria and cellulose in plants. - Answer Cell wall structures found...
Voorbeeld 1 van de 4 pagina's
In winkelwagena concept that defines cells as a fundamental unit of structure, function and organisation in all living organisms. - Answer Cell theory a tough outer layer which surrounds some cell types and is made of peptidoglycan in bacteria and cellulose in plants. - Answer Cell wall structures found...
What are the properties of water? - Answer - cohesion and adhesion - high surface tension - high specific heat capacity - polar solvent - less dense when solid Describe the property: cohesion - Answer - water molecules are polar due to the delta negative oxygen atom and delta positive ...
Voorbeeld 1 van de 2 pagina's
In winkelwagenWhat are the properties of water? - Answer - cohesion and adhesion - high surface tension - high specific heat capacity - polar solvent - less dense when solid Describe the property: cohesion - Answer - water molecules are polar due to the delta negative oxygen atom and delta positive ...
Cellular respiration - Answer process by which food is broken down to yield ATP, which is used as a source of energy for metabolic reactions Respiratory substrate - Answer the substance oxidised during cellular respiration Aerobic respiration - Answer cellular respiration that takes plac...
Voorbeeld 2 van de 5 pagina's
In winkelwagenCellular respiration - Answer process by which food is broken down to yield ATP, which is used as a source of energy for metabolic reactions Respiratory substrate - Answer the substance oxidised during cellular respiration Aerobic respiration - Answer cellular respiration that takes plac...
Which stage of aerobic respiration produces 4 molecules of CO2 per glucose? - Answer The Krebs Cycle How is glucose converted into pyruvate in Glycolysis? - Answer Glucose is phosphorylated with ATP and then broken into Gylcerate -3-phosphate. Then it is converted into Pyruvate using NAD prod...
Voorbeeld 1 van de 1 pagina's
In winkelwagenWhich stage of aerobic respiration produces 4 molecules of CO2 per glucose? - Answer The Krebs Cycle How is glucose converted into pyruvate in Glycolysis? - Answer Glucose is phosphorylated with ATP and then broken into Gylcerate -3-phosphate. Then it is converted into Pyruvate using NAD prod...
Solvent - Answer Substances dissolve in it e.g. water+++ dipolar - Answer Having a slightly positive charge and negative charge Cohesive - Answer They tend to stick together Cohesion - Answer Attraction between molecules of the same type Which side of the heart carries oxygenated...
Voorbeeld 2 van de 9 pagina's
In winkelwagenSolvent - Answer Substances dissolve in it e.g. water+++ dipolar - Answer Having a slightly positive charge and negative charge Cohesive - Answer They tend to stick together Cohesion - Answer Attraction between molecules of the same type Which side of the heart carries oxygenated...
Structure and function of plasmids. - Answer - Small short lengthed loops of DNA - contains genes for uses like antibiotic resistance Structure and function of the flagella / flagellum. - Answer - Hollow cylindrical long hair like structures. -This rotates to make prokaryotic cells move. ...
Voorbeeld 2 van de 6 pagina's
In winkelwagenStructure and function of plasmids. - Answer - Small short lengthed loops of DNA - contains genes for uses like antibiotic resistance Structure and function of the flagella / flagellum. - Answer - Hollow cylindrical long hair like structures. -This rotates to make prokaryotic cells move. ...
What are carbohydrates made out of? - Answer carbon, hydrogen and oxygen What is a monosaccharide (with examples of 3)? - Answer Carbohydrates with a single sugar unit, such a glucose, fructose and ribose What is a disaccharide (with 3 examples)? - Answer A carbohydrate with two sugar...
Voorbeeld 3 van de 21 pagina's
In winkelwagenWhat are carbohydrates made out of? - Answer carbon, hydrogen and oxygen What is a monosaccharide (with examples of 3)? - Answer Carbohydrates with a single sugar unit, such a glucose, fructose and ribose What is a disaccharide (with 3 examples)? - Answer A carbohydrate with two sugar...
Cell theory - Answer States that new cells are formed from existing cells and that the cell is a fundamental unit of structure, function and organisation in all living organisms. it is considered a unifying concept in biology Cells, tissues and organs - Answer In complex organisms, cell are o...
Voorbeeld 3 van de 16 pagina's
In winkelwagenCell theory - Answer States that new cells are formed from existing cells and that the cell is a fundamental unit of structure, function and organisation in all living organisms. it is considered a unifying concept in biology Cells, tissues and organs - Answer In complex organisms, cell are o...
What does CFTR protein mean? - Answer Cystic Fibrosis Transmembrane Concordance Regulator (gated channel protein) What does ENaC stand for? - Answer Epithelial Sodium Ion Channel What happens if there is excess water in an unaffected person's airways? - Answer 1) Excess water detected b...
Voorbeeld 2 van de 5 pagina's
In winkelwagenWhat does CFTR protein mean? - Answer Cystic Fibrosis Transmembrane Concordance Regulator (gated channel protein) What does ENaC stand for? - Answer Epithelial Sodium Ion Channel What happens if there is excess water in an unaffected person's airways? - Answer 1) Excess water detected b...
Add/Label - Answer Requires the addition or labelling to a stimulus material given in the question, for example labelling a diagram or adding units to a table. Assess - Answer Give careful consideration to all the factors or events that apply and identify which are the most important or relev...
Voorbeeld 1 van de 2 pagina's
In winkelwagenAdd/Label - Answer Requires the addition or labelling to a stimulus material given in the question, for example labelling a diagram or adding units to a table. Assess - Answer Give careful consideration to all the factors or events that apply and identify which are the most important or relev...
What is standard deviation? -Answer a computed measure of how much scores vary around the mean score What is a serial dilution? -Answer used to obtain a series of solution whose concentrations differ by known amounts Why do we measure initial rate of reaction? -Answer Reaction can ...
Voorbeeld 2 van de 15 pagina's
In winkelwagenWhat is standard deviation? -Answer a computed measure of how much scores vary around the mean score What is a serial dilution? -Answer used to obtain a series of solution whose concentrations differ by known amounts Why do we measure initial rate of reaction? -Answer Reaction can ...
1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 - Answer Daphnia of same species Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes Then BPM counted using tally marks of a sheet of paper for 15 seconds, x4 to give BPM r...
Voorbeeld 1 van de 3 pagina's
In winkelwagen1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 - Answer Daphnia of same species Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes Then BPM counted using tally marks of a sheet of paper for 15 seconds, x4 to give BPM r...
It's dipolar so it's a good solvent. And it has strong hydrogen bonds therefore it's cohesive - Answer Why is water good for transport? Gas exchange doesn't happen efficiently through diffusion so substances need to be transported around the body to organs - Answer Why do multicellular or...
Voorbeeld 1 van de 4 pagina's
In winkelwagenIt's dipolar so it's a good solvent. And it has strong hydrogen bonds therefore it's cohesive - Answer Why is water good for transport? Gas exchange doesn't happen efficiently through diffusion so substances need to be transported around the body to organs - Answer Why do multicellular or...
4.1: Explain how the variety of species has generally increased over time. - Answer Variety of life has become more extensive because species adapted to all environments in the world- even extreme habitats. 4.2: Explain the negative impact that some human activities (give 3 examples) have on di...
Voorbeeld 3 van de 16 pagina's
In winkelwagen4.1: Explain how the variety of species has generally increased over time. - Answer Variety of life has become more extensive because species adapted to all environments in the world- even extreme habitats. 4.2: Explain the negative impact that some human activities (give 3 examples) have on di...
What type of reactions do organisms need to carry out to survive? - Answer Metabloic Reactions What is a catalyst? - Answer A chemical that speeds up the rate of reaction and remains unchanged and reusable at the end of the reaction What are biological catalysts for metabolic reactions? - ...
Voorbeeld 2 van de 7 pagina's
In winkelwagenWhat type of reactions do organisms need to carry out to survive? - Answer Metabloic Reactions What is a catalyst? - Answer A chemical that speeds up the rate of reaction and remains unchanged and reusable at the end of the reaction What are biological catalysts for metabolic reactions? - ...
What does homeostasis mean? - Answer Maintenance of a state of dynamic equilibrium What does homeostasis control? - Answer Constant internal environment, including constant temperature water potential and pH Why must temperature and pH be regulated? - Answer For optimum enzyme activit...
Voorbeeld 2 van de 15 pagina's
In winkelwagenWhat does homeostasis mean? - Answer Maintenance of a state of dynamic equilibrium What does homeostasis control? - Answer Constant internal environment, including constant temperature water potential and pH Why must temperature and pH be regulated? - Answer For optimum enzyme activit...
Population - Answer Group of organisms of the same species in the same habitat at the same time Community - Answer A collection of all organisms of different species in the same place at the same time Ecosystem - Answer The interaction of different communities between each other and t...
Voorbeeld 1 van de 4 pagina's
In winkelwagenPopulation - Answer Group of organisms of the same species in the same habitat at the same time Community - Answer A collection of all organisms of different species in the same place at the same time Ecosystem - Answer The interaction of different communities between each other and t...
Water Potential - Answer Turgor Pressure + Osmotic Potential Diffusion - Answer The movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient. Facilitated diffusion - Answer Diffusion that takes place through carrier protein...
Voorbeeld 2 van de 5 pagina's
In winkelwagenWater Potential - Answer Turgor Pressure + Osmotic Potential Diffusion - Answer The movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient. Facilitated diffusion - Answer Diffusion that takes place through carrier protein...
Prokaryotic cell - Answer Cells that don't have a nucleus and other membrane bound organelles. Eukaryotic cell - Answer Cells with linear DNA inside nucleus, mitochondria present, larger ribosomes. Mitochondrion - Answer Inner of its two membranes folded to form finger-like projectio...
Voorbeeld 1 van de 2 pagina's
In winkelwagenProkaryotic cell - Answer Cells that don't have a nucleus and other membrane bound organelles. Eukaryotic cell - Answer Cells with linear DNA inside nucleus, mitochondria present, larger ribosomes. Mitochondrion - Answer Inner of its two membranes folded to form finger-like projectio...
Exons - Answer the coding regions of DNA Introns - Answer the large, non-coding regions of DNA that are removed before messenger RNA is translated into proteins DNA (gene) sequencing - Answer the analysis of the individual base sequence along a DNA strand or an individual gene Polymer...
Voorbeeld 2 van de 5 pagina's
In winkelwagenExons - Answer the coding regions of DNA Introns - Answer the large, non-coding regions of DNA that are removed before messenger RNA is translated into proteins DNA (gene) sequencing - Answer the analysis of the individual base sequence along a DNA strand or an individual gene Polymer...
How do you investigate the effect of sucrose concentration on the growth of pollen tubes? - Answer 1. Make up solutions of sucrose between 0.2-2 moldm-3 2. Collect a petri dish for each sucrose concentration and place a moistened filter paper on each 3. Collect one microscope slide per concentra...
Voorbeeld 2 van de 10 pagina's
In winkelwagenHow do you investigate the effect of sucrose concentration on the growth of pollen tubes? - Answer 1. Make up solutions of sucrose between 0.2-2 moldm-3 2. Collect a petri dish for each sucrose concentration and place a moistened filter paper on each 3. Collect one microscope slide per concentra...
What are target cells? - Answer Cells with receptor proteins on their cell surface membrane complimentary to the chemical What are meristems? - Answer Regions of actively dividing cells e.g. roots and shoots What do cytokinins do? - Answer promote cell division of stem and promote growth...
Voorbeeld 2 van de 11 pagina's
In winkelwagenWhat are target cells? - Answer Cells with receptor proteins on their cell surface membrane complimentary to the chemical What are meristems? - Answer Regions of actively dividing cells e.g. roots and shoots What do cytokinins do? - Answer promote cell division of stem and promote growth...
Biosphere -Answer part of the atmosphere and earth inhabited by living organisms Habitat -Answer Set of conditions where an organism lives Population -Answer All the organisms of one species in a habitat Population size/Abundance -Answer The number of individuals of one spec...
Voorbeeld 2 van de 7 pagina's
In winkelwagenBiosphere -Answer part of the atmosphere and earth inhabited by living organisms Habitat -Answer Set of conditions where an organism lives Population -Answer All the organisms of one species in a habitat Population size/Abundance -Answer The number of individuals of one spec...
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