Aqa A-Level Biology Paper 1 Study Guide Rated A+

branched {Ans: Glycogen is....}Fibrils {Ans: Cellulose forms long chains called...}Amylopectin {Ans: Branched form of starch. More easily hydrolysed.}how can you investigate transport using radioactive tracers? {Ans: a plant is supplied with 14C, which becomes incorporated into organic substances in the plant. The plant is then frozen in liquid nitrogen to kill and fix it quickly, and placed onto photographic film in the dark. The resulting autoradiograph shows the location of compounds containing 14C. this shows that organic compounds (presumably sugars) are transported downwards from the leaf to the roots.}what is a vaccine? {Ans: Contains antigen / proteins / dead / weakened microorganism / pathogen / virus / bacteria; Stimulates production of antibodies / plasma cells / memory cells}Biuret is made up of... {Ans: equal volumes and copper sulphate and sodium hydroxide}