Bio paper 1 2024 questions and their correct answers, Exams of Biology

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Bio paper 1 2024 questions and their

correct answers

Chemical equation for aerobic respiration - Correct Answers glucose+ oxygen makes water + carbon dioxide symbol equation for aerobic respiration - Correct Answers 6O(2)+C(6)H(12)O(6) makes 6H(2)O+6CO(2) Name the sub cellular structures where aerobic respiration takes place - Correct Answers mitochondria Give two uses of energy released in respiration - Correct Answers muscle contraction and active transport Describe two differences between aerobic and anaerobic respiration in humans - Correct Answers 1) anaerobic respiration produces lactic acid and aerobic does not 2) aerobic respiration produces water unlike anaerobic Two types of microorganism that causes diseases in humans - Correct Answers Bacteria, fungus Which two defense systems prevent microorganisms infecting the body - Correct Answers Hydrochloric acid is produced in the stomach and the skin is a barrier carrying the body How does the immune system destroy microorganisms - Correct Answers white blood cells engulf the microorganism Where is the right atrium on the heart diagram - Correct Answers left side? Magnification equation - Correct Answers image size/ real size Where is bile found - Correct Answers made in liver, stored in gallbladder What does bile do - Correct Answers emulsifies fat droplets bro increase surface area so lipase can digest food easier and it neutralizes acid What’s the difference between phloem and xylem - Correct Answers phloem= translocation, Xylem= transpiration

Diffusion - Correct Answers movement of particles from area of high concentration to low concentration Osmosis - Correct Answers movement of WATER particles from area of high concentration to low concentration Active transport - Correct Answers movement of particles from area of low concentration to high concentration What’s translocation - Correct Answers the movement of a substance from one place to another? What type of cell is a stem cell - Correct Answers undifferentiated which can undergo division to produce more similar cells What do red bloody cells have and why - Correct Answers hemoglobins-to allow oxygen to bind to it easier How can photosynthesis be made faster - Correct Answers increasing light intensity and temp but if you exceed 45 degrees it will denature What is mitosis for - Correct Answers growth and repair + usually for asexual reproduction as it created identical clones? What is meosis for - Correct Answers sex cells (gametes) used for sexual reproduction? What are limiting factors of photosynthesis - Correct Answers temp too high (over 45 degrees), amount of chlorophyll, light intensity Different between light microscope and electron microscope - Correct Answers light m= only see alive cells/ organisms Electron m=can only see dead cells/ organisms What is chlorophyll - Correct Answers a green pigment found in chloroplast and absorbs light energy from sun to carry out photosynthesis What do valves do - Correct Answers prevent back flow of blood Where are valves found - Correct Answers veins, heart? What are enzymes - Correct Answers proteins that speed up a reaction and break down large molecules into smaller ones by using lock and key method? What do lock and key represent - Correct Answers lock= enzyme itself Key= molecule that's being broken down (called the substrate)

What does the enzyme active space being specific do - Correct Answers means only one kind of substrate can fit into the enzyme What happens when the substrate goes into the enzyme - Correct Answers the bonds in it break up to form the products What happens when the temperature increases (lock and key mechanism) - Correct Answers the speed at which the enzymes work increases up to a certain point