Edexcel IGCSE Biology Paper 1: Revision Questions with Complete Solutions. Guaranteed Best for Exam Preparation

What are the characteristics of living things? - AnsMove, respire, sensitivity, grow, respire, excrete, nutrition, control Describe eukaryotic cells Example - AnsComplex large cell Contain Nucleus Any mammal/insect cell Describe prokaryotic cells Example - AnsSmall simple cell No nucleus Floating DNA Amoeba/Chlorella Animal cell: Structure Carbohydrate store Example - AnsMulticellular Contain: No cell wall Store carbs as Glycogen Any mammal/insect Plant cell: Structure Carbohydrate store Example - AnsCell wall, vacuole, chloroplasts Store carbs as starch or sucrose Beans/maize Fungi: Structure Feeding method Store carbohydrates Example - AnsBody called mycelium made up of hyphae (thread like structures) Cell walls made of chitin Saprotrophic nutrition - release enzymes into surroundings to dissolve food Store carbs as glycogen Yeast Describe the levels of organization - AnsOrganelle, cell, tissue, organ, organ system What is the function of the mitochondria? - Anscellular respiration for energy function of ribosomes - Ansprotein synthesis function of chloroplast - AnsContains chlorophyll which absorbs light energy for photosynthesis function of vacuole - AnsStores water, salts, proteins and carbs and provides structure Define pathogen - Ansdisease causing organism Describe viruses Example - Anssmall cells, can only reproduce in living cells, no cellular structure, protein coat and contain DNA or RNA HIV Describe bacteria - Anssingle celled, no nucleus, contain circular chromosomes of DNA, contain plasmids (extra bits of DNA