Transpiration: The loss of water vapour from the leaves of a plant as a result of evaporation water from cell surfaces inside the leaf, and then its diffusion down a concentration gradient out of the stomata. We provide detailed revision materials for A-Level Biology students and teachers. Sugar is produced in the photosynthetic tissues and must be exported from these sources to areas of need, i.e. Transpiration. Chromosomal translocations are typically seen in cases of leukemia, like, for instance, in acute myeloid leukemia. 2.5.2 – Outline DNA transcription in terms of the formation of an RNA strand complementary to the DNA strand by RNA polymerase. BIOLOGY: translocation (OCR AS) OCR Breadth in Biology [Exam Jam] BIOLOGY Your Strengths and Worries - 28th May biology alevel meltdown How much sleep do i need OCR Biology AS June 2014 ... AQA A-level Biology Autumn Exam 7402 Paper 1,2,3 12/16/20 Oct 2020 - Exam Discussion A complimentary copy of the DNA is made in the nucleus to form the mRNA.This process is catalysed by the enzyme RNA polymerase.To copy the mRNA, the DNA double helix is unwound by DNA helicase, with the hydrogen bonds breaking between the … The source is where food is produced. A translocation is a chromosomal abnormality whereby there's a break in the chromosome, one particular chromosome, and that chromosome will then fuse to a different chromosome. Over 22,000 learners have used our materials to pass their exams. Translocation This is an active process by which sugars and amino acids are transported through the phloem. A-Level Biology does pretty much what it says on the tin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Translocation Assimilates (sucrose and amino acids) move between sources (leaves and storage organs) and sinks ( buds, flowers, fruits, roots and storage organs) in phloem sieve tubes in a process called translocation. Plants produce carbohydrates (sugars) in their leaves by photosynthesis, but nonphotosynthetic parts of the plant also require carbohydrates and other organic and nonorganic materials. It requires energy to create a pressure difference and so is considered an active process. Start studying AQA A Level Biology 4/5/6 mark questions. Sucrose is loaded into the phloem at a source, usually a photosynthesizing leaf. Menu. Translocation is the movement of assimilates (nutrients), but mainly sucrose, up or down the phloem It starts at the source and ends at the sink The source can be … This transportation is called the mass-flow hypothesis. And then you have what we call a fusion product. usually areas which have large energy requirements. Translocation - Translocation is the movement of dissolved substances to where they're needed in a plant - Its an energy-requiring process that happens in the phloem The … The products from the source are usually translocated to the nearest sink through the phloem. Translocation This is the process of transporting sugar and takes place in the phloem. Translocation can be an effective management strategy and important topic in conservation biology, but despite their popularity, translocations are a high‐cost endeavor with a history of failures. Translocation is the movement of materials from leaves to other tissues throughout the plant. Movement in the phloem This process is called translocation and involves the movement of organic substances around the plant. a level biology student. 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