Biodiversity, evolution and disease. Phases of mitosis. These revision notes include all the information needed for module 6 of this syllabus. NOTE: Numbers in bracket is indicative of marks available for a particular question. How do alkylating agents lead to mutations? A-level OCR biology past papers. Cellular Biology Chemistry Earth Science Environmental Science Genetics Geology Life Science ... Pest Control Plumbing Policing Wastewater Welding Law; Australian Law Bankruptcy Bar Exam ... A Level Biology - OCR A Level Business - OCR A Level Chemistry - OCR How does ionising radiation lead to mutations? Classification. Practical skills assessed in a written examination; Practical skills assessed in the practical endorsement Prepare for your GCSE OCR Biology Exam. OCR (A) A-Level Biology We have worked hard to compile every past paper by topic and exam board! How do deaminating agents lead to mutations? Over 22,000 learners have used our materials to pass their exams. Why are homeobox sequences so similar between plants, animals and fungi? A random change to the sequence of bases in the DNA, Where one base pair replaces another (substitution). Free timetable app ← Back to Library. A-level results day 2020; Past papers; Grow your Grades; Subjects A-G. A-level Biology ; A-level Business Studies; A-level Chemistry; A-level Economics; A-level English; Module 6 – Genetics, Evolution and Ecosystems Revision Notes: Biotechnology; Cellular Control Phases of the cell cycle. Question Paper. Sequence of 180 base pairs found within genes that are involved in regulating patterns of anatomical development in animals, fungi and plants, Binds to DNA and regulates the transcription of adjacent genes, Refines body parts by removing unwanted structures, Genes are switched on or off in the correct cells allowing the correct body plan to develop. Subset of homeobox genes, found only in animals; involved in formation of anatomical features in correct locations of body plan. Mutations 2. Review of transcription and Transcription factors 3. Ask the Subject Expert: AS/A Level Biology A H420, H020 and Biology B H422, H022 (Online Q&A) CPD course • Online webinar • FREE • AS and A Level Biology A - H020, H420, AS and A Level Biology B (Advancing Biology) - H022, H422. ... Other questions in this quiz. It’s … A2 OCR Biology - Cellular Control. OCR A Level Biology: Cellular Control study guide by tflanagan22 includes 56 questions covering vocabulary, terms and more. Examination Board: Year 12 & 13 will follow the OCR A Level Biology A Course Specification Mark Scheme. Cell fractionation is the process in which cells are broken up and the different organelles they contain separate out. Polypeptide – a polymer consisting of a chain of amino acids residues joined by peptide bonds. Cellular Control state that genes code for polypeptides including enzymes Gene – a length of DNA that codes for one or more polypeptides, including enzymes. 2. Instant access to hundreds of A Level Biology Teaching Resources - 385 Bio Factsheets, PowerPoints, Questions by topic for AQA, Edexcel, OCR and WJEC Biology AS and A Levels. Practice: Mitosis questions. This is the currently selected item. Quizlet flashcards, activities and games help you improve your grades. Level. Shoots. These, combined with the Practical Endorsement, constitute the full A Level. So if you’re revising Cell Division for OCR (A) A-Level Biology, you can find all of the Cell Division questions that have been ever asked by OCR in one single document - useful, no? Everything you need to know about Cell Structure for the A Level Biology OCR exam, totally free, with assessment questions, text & videos. 2.1.6 Cell division, cell diversity and cellular organisation (a) the cell cycle: To include the processes taking place during interphase (G 1, S and G 2), mitosis and cytokinesis, leading to genetically identical cells. For the new OCR specification 6.1.1 Cellular control lessons Also included is a hand out that I give to students to annotate diagrams and write notes in. Make sure you know what you have to do before starting Phototropisms. OCR A-Level Biology A (H420 & H020) and Biology B Advancing Biology (H422 & H020) past (exam papers and marking schemes, the past papers are free to … Bind to proteins that regulate transcription, change binding of proteins to control elements, change rate of transcription. (i) A gene controlling coat colour in cats is sex linked. They're important genes so changes to them are lethal so can't be passed on, Only present in animals, control the positioning of body parts, order in which the genes appear is the same as the order they are expressed in, found in gene clusters, control polarity of the body, regulate mitosis and apoptosis, Importance of mitosis and apoptosis in controlling the development of body form, Mitosis increases the number of cells so growth occurs, apoptosis shapes the body by removing unwanted cells, cells doing apoptosis release chemical signals to trigger mitosis to remodel tissues, Enzymes break down the cell's cytoskeleton, cytoplasm becomes denser, blebs form, chromatin condenses, nuclear envelope breaks, DNA fragments, cell breaks into vesicles, vesicles taken up by phagocytosis, doesn't damage other cells, Feature of genes that regulate the cell cycle and apoptosis, Can respond to internal and external cell stimuli, Factors that affect the expression of regulatory genes, Changes to temperature, changes to light intensity, release of hormones, psychological stress, Examples of drugs that affect the expression of regulatory genes, Condition produced when the homeostatic balance within an organism is upset, Catalyses the hydrolysis of lactose to glucose and galactose, Catalyses the transport of lactose into the cell. Attachment of methyl or ethyl groups causes the incorrect pairing of bases in replication, Incorporated into DNA during replication in place of the usual bases, Codon becomes a stop codon which shortens the protein, New amino acid has similar properties to the original so the effect is less severe, New amino acid has different properties to the original so has larger effects, Mutation that results in a non-functioning protein, Mutation that reduces the functioning of a protein, Mutation that increases the functioning of a protein, Types of regulatory mechanism that control gene expression, Transcriptional, post-transcriptional, post-translational, Examples of transcriptional level regulatory mechanisms, Examples of post-transcriptional level regulatory mechanisms, Examples of post-translational level regulatory mechanisms, How the lac operon works when glucose is present, Regulatory gene codes for repressor protein, repressor protein binds to operator region, RNA polymerase can't bind to the promoter region, transcription of lacZ and lacY can't occur, beta galactosidase and lactase permease aren't produced, How the lac operon works when glucose isn't present, Lactose binds to the repressor protein and changes its tertiary structure, can no longer bind to the operator region, RNA polymerase binds to the promoter region, transcription of lacZ and lacY, beta galactosidase and lactase permease are produced in translation, Binds at a target sequence, makes it harder or easier for RNA polymerase to bind to the promoter of the gene, Introns are removed, exons joined together, modified nucleotide cap put on 5' end, polyA tail on 3' end, Stabilise mRNA, delay degradation in the cytoplasm, cap aids binding of the mRNA to the ribosomes, Nucleotide sequence of mRNA can be changed from insertion, deletion and substitution mutations, different proteins with different functions synthesised, Example of the activation of proteins by cAMP, In the lac operon the low glucose concentration increases concentrations of cAMP, cAMP binds to cAMP receptor protein, activates it, binds to the DNA, helps RNA polymerase bind, Regulation of the pattern of anatomical development, Genes which contain the 180bp homeobox sequence, codes for the homeodomain on transcription factors which binds to DNA to switch genes on or off, control body plan, Highly conserved and similar between plants and animals and fungi. 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