Unit 6 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. Following each question is the markscheme answer which was used to evaluate student answers on the examination paper.
There are four levels of protein structure: The primary structure of a protein is its amino acid sequence. This amino acid sequence is determined by the base sequence of the gene which codes for the protein. These form as a result of hydrogen bonds between the peptide groups of the main chain.
The tertiary structure of a protein is its three-dimensional conformation which occurs as a result of the protein folding. This folding is stabilised by hydrogen bonds, hydrophobic interactions, ionic bonds and disulphide bridges. These intramolecular bonds form between the R groups of different amino acids.
A quaternary structure is formed when two or more polypeptide chains associate to form a single protein. An example is haemoglobin which consists of four polypeptide chains.
In some cases, some proteins can have a non-polypeptide structure called a prosthetic group. These proteins are called conjugated proteins. The haem group in haemoglobin is a prosthetic group.
Protein shape can be categorised as either fibrous or globular. Fibrous proteins tend to be elongated, physically tough and insoluble in water.
Collagen found in the skin and keratin found in hair are examples of fibrous proteins. Globular proteins tend to be compact, rounded and water soluble. Haemoglobin and enzymes are examples of globular proteins. Amino acids have different R groups.
Some of these R groups will be hydrophilic, making the amino acid polar, while others will be hydrophobic, making the amino acid non-polar. The distribution of the polar and non-polar amino acids in a protein influences the function and location of the protein within the body.
Non-polar amino acids are found in the centre of water soluble proteins while the polar amino acids are found at the surface. Examples of how the distribution of non-polar and polar amino acids affect protein function and location: Controlling the position of proteins in membranes: The non-polar amino acids cause proteins to be embedded in membranes while polar amino acids cause portions of the proteins to protrude from the membrane.Biology: Biology, study of living things and their vital processes that deals with all the physicochemical aspects of life.
Modern principles of other fields, such as chemistry, medicine, and physics, for example, are integrated with those of biology in areas such as biochemistry, biomedicine, and biophysics.
In the last two decades, the widespread application of genetic and genomic approaches has revealed a bacterial world astonishing in its ubiquity and diversity. This review examines how a growing knowledge of the vast range of animal–bacterial interactions, whether in shared ecosystems or intimate symbioses, is fundamentally altering our understanding of animal biology.
Previous IB Exam Essay Questions: Unit 6. Biology IB HL 1. Previous IB Exam Essay Questions: Unit 6 Outline the effect of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis.
light: rate of photosynthesis increases as light intensity increases. Description. The purpose of this course is to provide an introduction to Web design.
Students will learn concepts related to planning and developing web sites by studying Web usability, multimedia, and Web applications for business and education web sites. Eight steps to an extended essay; Extended essay - self review questions; Role of the supervisor; To make this simple photosynthesis protocol into a mini investigation and to practise planning an IA individual experiment work through the steps on the Photosynthesis experiment design worksheet.
Photosynthesis experiments can be tricky. Student Guide: Extended Essays in Biology Overview An extended essay in biology provides you the student with an opportunity to apply a range of skills while researching a topic of.