Continuous variation across the geographical range of related populations matches the concept of gradual divergence. Availability of phosphate may become limiting to agriculture in the future. Light-dependent reactions take place in the intermembrane space of the thylakoids. (Typically you don't choose, but rather your teacher does.) Relative numbers of indicator species can be used to calculate the value of a biotic index. Each paper and each mark scheme cost $3.99, so one full exam (including paper 1, paper 2, paper 3, and the mark schemes) will cost you about $24. Other gases including methane and nitrogen oxides have less impact. The replication of DNA is semi-conservative and depends on complementary base pairing. Gene expression is regulated by proteins that bind to specific base sequences in DNA. Addiction can be affected by genetic predisposition, social environment and dopamine secretion. Synapses are junctions between neurons and between neurons and receptor or effector cells. Absorption of light by photosystems generates excited electrons. Topical Past Papers Questions; 2012 – 2016; Questions + Marck schemes; P1 , P2 HL & SL; All Time Zones; May/June & Oct/Nov Essential nutrients cannot be synthesized by the body, therefore they have to be included in the diet. B lymphocytes are activated by T lymphocytes in mammals. Viruses lack a metabolism and cannot therefore be treated with antibiotics. Competitive exclusion and the absence of predators can lead to reduction in the numbers of endemic species when alien species become invasive. Metabolic pathways consist of chains and cycles of enzyme-catalysed reactions. What SAT Target Score Should You Be Aiming For? Interphase is a very active phase of the cell cycle with many processes occurring in the nucleus and cytoplasm. Students can use it to access questions related to topics, while teachers can use the software during teaching and to make exam papers easily. Limiting factors can be top down or bottom up. They need to perform a thorough investigation on a topic of their choice. Predisposition to a genetic disease can be detected through the presence of markers. A karyogram shows the chromosomes of an organism in homologous pairs of decreasing length. Well, if you choose a topic/research question that is obvious or simplistic, your investigation really has no value to offer. The structure of cells of the epithelium of the villi is adapted to the absorption of food. Carbon dioxide is produced by respiration and diffuses out of organisms into water or the atmosphere. Chlorophyll absorbs red and blue light most effectively and reflects green light more than other colours. Air is carried to the lungs in the trachea and bronchi and then to the alveoli in bronchioles. All rights reserved. We want to get you admitted to your dream schools. Both classes cover the same six topics in the order listed below with the same subtopics listed below: Only students taking IB Biology HL cover these topics. In the Krebs cycle, the oxidation of acetyl groups is coupled to the reduction of hydrogen carriers, liberating carbon dioxide. Synovial joints allow certain movements but not others. BLASTn allows nucleotide sequence alignment while BLASTp allows protein alignment. What’s the purpose of an IA paper, you might wonder? The capacity of stem cells to divide and differentiate along different pathways is necessary in embryonic development and also makes stem cells suitable for therapeutic uses. 9. ACT Writing: 15 Tips to Raise Your Essay Score, How to Get Into Harvard and the Ivy League, Is the ACT easier than the SAT? Carbon dioxide is transformed in red blood cells into hydrogencarbonate ions. Metabolic pathways can be controlled by end-product inhibition. Oxygen dissociation curves show the affinity of hemoglobin for oxygen. The cascade results in the rapid conversion of fibrinogen to fibrin by thrombin. Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and solvent properties of water. Fermentation is carried out by batch or continuous culture. Impact of body exercises on heart rate and blood pressure. Translation is the synthesis of polypeptides on ribosomes. Two species cannot survive indefinitely in the same habitat if their niches are identical. Independent assortment of genes is due to the random orientation of pairs of homologous chromosomes in meiosis I. Gene loci are said to be linked if on the same chromosome. Carbon dioxide diffuses from the atmosphere or water into autotrophs. Energy losses between trophic levels restrict the length of food chains and the biomass of higher trophic levels. Our team of professional writers know what it takes to deliver a well-articulated Biology IA paper that meets your deadlines and requirements. Saprotrophs are heterotrophs that obtain organic nutrients from dead organisms by external digestion. Ex situ conservation is the preservation of species outside their natural habitats. Energy released by oxidation reactions is carried to the cristae of the mitochondria by reduced NAD and FAD. Want to build the best possible college application? 10. In a natural classification, the genus and accompanying higher taxa consist of all the species that have evolved from one common ancestral species. Chi-squared tests are used to determine whether the difference between an observed and expected frequency distribution is statistically significant. Calcium ions and the proteins tropomyosin and troponin control muscle contractions. The College Entrance Examination BoardTM does not endorse, nor is it affiliated in any way with the owner or any content of this site. Your answers and pdf solution helped raise my grade from failing to 3 to 6 and I really appreciate your website has the detail solution of IB Chemistry Answers. Ribulose bisphosphate is reformed using ATP. In glycolysis, glucose is converted to pyruvate in the cytoplasm. Methane is oxidized to carbon dioxide and water in the atmosphere. OPTION B: BIOCHEMISTRY. The secondary structure is the formation of alpha helices and beta pleated sheets stabilized by hydrogen bonding. The two alleles of each gene separate into different haploid daughter nuclei during meiosis. Energy released from carbon compounds by respiration is used in living organisms and converted to heat. Microorganisms are used in industry because they are small and have a fast growth rate. The phases shown in the sigmoid curve can be explained by relative rates of natality, mortality, immigration and emigration. PrepScholar Admissions is the world's best admissions consulting service. 11. Statistical Analysis. The warmed Earth emits longer wavelength radiation (heat). Fetal hemoglobin is different from adult hemoglobin allowing the transfer of oxygen in the placenta onto the fetal hemoglobin.
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