AQA AS LEVEL BIOLOGY REVISION QUESTIOS AND 100% CORRECT ANSWERS

AQA AS LEVEL BIOLOGY REVISION QUESTIOS AND 100% CORRECT ANSWERS 3 types of lipids? triglycerides phospholipids cholesterol active immunity? has memory cells long term immunity produces own antibodies occurs by vaccine or infection active transport of glucose in the small intestine? sodium ions actively transported from the epithelial cells into the blood stream, creating a concentration gradient as concentration is lower in cell sodium ions move into epithelial cells through diffusion glucose is pulled in through a Co transport protein with sodium glucose builds up in cell, so moves into bloodstream by diffusion adaptation of capillaries? millions so large surface area thin wall so short diffusion distance narrow lumen to decrease diffusion distance circulation maintains low oxygen high co2 concentration gradient adaptation of palisade cells for photosynthesis? near top so close to light large size and surface area thin cell wall so short diffusion difference for co2