3.2.1 Distinguish between organic and inorganic compounds Show
Carbohydrates are organic compounds consisting of one or more simple sugars that as monomers follow the general basic formula of (CH2O)x Note: Exceptions to this basic formula and the inclusion of other atoms (e.g. N) can occur 3.2.2 Identify glucose and ribose from diagrams showing their structure Glucose (C6H12O6) Ribose (C5H10O5) 3.2.3 List three examples each of monosaccharides, disaccharides and polysaccharides Monosaccharides: Glucose, galactose, fructose Disaccharides: Lactose, maltose, sucrose Polysaccharides: Cellulose, glycogen, starch 3.2.4 State one function of glucose, lactose and glycogen in animals and of fructose, sucrose and cellulose in plants Animals Glucose: A source of energy which can be broken down to form ATP via cellular respiration Lactose: A sugar found in the milk of mammals, providing energy for suckling infants Glycogen: Used by animals for short term energy storage (between meals) in the liver Plants Fructose: Found in honey and onions, it is very sweet and a good source of energy Sucrose: Used primarily as a transportable energy form (e.g. sugar beets and sugar cane) Cellulose: Used by plant cells as a strengthening component of the cell wall 3.2.5 Outline the role of condensation and hydrolysis in the relationship between monosaccharides, disaccharides and polysaccharides
A Condensation Reaction between Two Monosaccharides Lipids are a group of organic molecules that are insoluble in water but soluble in non-polar organic solvents Common lipids include triglycerides (fats and oils), phospholipids and steroids 3.2.2 Identify fatty acids from diagrams showing their structure General Structure Saturated (no double bonds) Unsaturated (double bonds) 3.2.5 Outline the role of condensation and hydrolysis in the relationship between fatty acids, glycerol and triglycerides
Formation of a Triglyceride 3.2.6 State three functions of lipids Structure: Phospholipids are a main component of cell membranes Hormonal signalling: Steroids are involved in hormonal signalling (e.g. estrogen, progesterone, testosterone) Insulation: Fats in animals can serve as heat insulators while sphingolipids in the myelin sheath (of neurons) can serve as electrical insulators Protection: Triglycerides may form a tissue layer around many key internal organs and provide protection against physical injury Storage of energy: Triglycerides can be used as a long-term energy storage source 3.2.7 Compare the use of carbohydrates and lipids in energy storage Similarities:
Differences:
Proteins are large organic compounds made of amino acids arranged in a linear chain The sequence of amino acids in a protein is defined by a gene and encoded in the genetic code 3.2.2 Identify amino acids from diagrams showing their structure Generalised Structure of an Amino Acid 3.2.5 Outline the role of condensation and hydrolysis in the relationship between amino acids and polypeptides
Formation of a Dipeptide What cellular function do carbohydrates and lipids share?Similarities: Complex carbohydrates (e.g. polysaccharides) and lipids both contain a lot of chemical energy and can be used for energy storage. Complex carbohydrates and lipids are both insoluble in water - they are not easily transported.
What does carbohydrates and lipids have in common?Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen. In addition to storing energy, lipids help build certain hormones; provide insulation; and form cell membranes. Proteins contain atoms from the main three elements plus nitrogen. They are formed from 21 types of monomers called amino acids.
Which of the following correctly describes the functions of carbohydrates and lipids?Both carbohydrates and lipids function as important energy storage molecules.
What evidence would best support the argument that the structures of carbohydrates and lipids are related to their roles in energy storage?What evidence would best support the argument that the structures of carbohydrates and lipids are related to their roles in energy storage? Both types of molecules have many carbon-hydrogen bonds. Which statement correctly compares the roles of different types of organic molecules in the body?
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