This essay summarizes the structure and function of membranes and the proteins within them, and describes their role in trafficking and transport, and their. Previous ib exam essay questions: unit 3 use these model essay question responses to prepare for essay questions on your in class tests, as well as the ib examination, paper 2 these questions have appeared on recent ib examinations, exactly as shown below. Biology ib hl 1 previous ib exam essay questions: unit 4 use these model essay question responses to prepare for essay questions on your in class tests, as well as the ib examination, paper 2. The central dogma of molecular biology is an explanation of the flow of genetic information within a biological system it is often stated as dna makes rna and rna makes protein, although this is not its original meaning. Proteins are an of import molecule that plays a critical function in populating beings more than 50 % of dry mass of most cells is protein proteins have many different maps and some of them are: despite holding an tremendous scope of maps proteins are made up from the same basic constituents.
The roles of specific ions and describe how animals, plants and bacteria use them productivity in an ecosystem in the soil is limited in part by the availability of fixed nitrogen in the soil. The native conformation of a protein is a stable three-dimensional structure that strongly determines a protein's biological function when a protein loses its biological function as a result of a loss of three-dimensional structure, we say that the protein has undergone denaturation. Transcription the first step in making a protein is called transcription this is when the cell makes a copy (or transcript) of the dna the copy of dna is called rna because it uses a different type of nucleic acid called ribonucleic acid.
Protein is a large molecule made from chains of amino acids, which are the subunits of protein molecules eukaryotes produce these proteins through a process called protein synthesis. For a flavor of the various roles of proteins in today's organisms, we can look to the yeast saccharomyces cerevisiae, a simple unicellular eukaryote the yeast genome is predicted to encode about 6225 proteins (see table 7-3 . Each protein has a specific function within the body and this is important to biology as many biological reactions would not occur without them, for example antibodies antibodies are proteins that are specialised in defending the body from antigens which can cause disease.
Below in this essay, will illustrate the how different structure of a protein is related to its given function the exact sequence of amino acids in a polypeptide within a protein molecule is the primary structure of a protein. Proteins do more in your body than just help build strong muscles they are present in every cell and tissue, each one with a highly specialized function necessary for normal development and function with no one role more important than the others you obtain most of the protein your body uses. The function of a protein is directly dependent on its threedimensional structure remarkably, proteins spontaneously fold up into three-dimensional structures that are determined by the sequence of amino acids in the protein polymer. For each type, describe its role in determining protein structure (b) discuss how the structure of a protein affects the functions of two of the following - muscle contraction - regulation of enzyme activity - cell signaling (c) abnormal hemoglobin is the identifying characteristic of sickle cell anemia. Example essay one give an account of protein synthesis under the following headings: mrna synthesis the role of mrna in protein synthesis (10 marks available.
It includes papers on glycoprotein hormones, thymus hormones, chromosome biology and chemistry, and the evolution of histones part iii examines the evolution of proteins, including the evolution of cythochrome c and evolution of phycobilisome of cyanobacteria and red algae. (b) haemoglobin is a conjugated protein consisting ofglobin and haeme haemoglobin carries oxygen in the form of oxyhaemoglobin in blood (5) antibodies: some antibodies like gramicidin s, tyrocidin and penicillin g are peptides. The first step in transcription is the partial unwinding of the dna molecule so that the portion of dna that codes for the needed protein can be transcribed.
Protein plays role in helping plants see light october 12, 2011, university of missouri-columbia plants do not have eyes or legs, yet they are able to see and move toward and away from light. This document contains the essay titles and mark schemes used in aqa a-level biology examinations since 2007 the specifications these exam questions came from are no longer in. 4 what is the role of messenger rna and ribosomes in protein synthesis messenger rna (mrna) is produced within the nucleus of a cell and migrates to the cytoplasm, where it attaches to ribosomes and guides the building of the amino acid sequences that will compose proteins.
Whey protein is reputed to help people quit smoking, and i would agree that using some whey protein is better than smoking cigarettes, but that is its only advantage once you have quit cigarettes, then move on and stop the whey protein powder in favor of whole food proteins such as eggs, meats and raw cheeses. The protein folding and misfolding biology essay introduction: almost each chemical process on which our lives depend is enthused or controlled by protein molecules. Protein molecules are involved in a range of aspects of a cell's biology they come in a huge variety of forms and perform a massive range of functions they are involved in muscle movement, storage of energy, digestion, immune defence and much more.