Question
•Discuss three (3) types of energy sources used by cells then provide two (2) examples of when / in what cells / situations your chosen energy sources are used. Next describe two (2) forms of transport within the cell and the specific energy source used in each form of transport.
•The effectiveness of dieting has been debated for years. There are several diets available including Atkins, Zone, Carbohydrate, Weight – Watchers, Jenny Craig, Dukan, Mediterranean, or 22 Day Vegan. Choose two (2) diets that were listed previously then explain four (4) effects each of your selected diets has on one’s energy and overall health including any hazardous effects.
•Review the animation on enzymes found here then in your own words define the term enzyme. Next choose one (1) enzyme of your choice then determine its function in the body. In addition, discuss three (3) advantages of having metabolic pathways in the cell and the specific role enzymes play in those processes.
Sample paper
Biology Discussion
Enzymes are substances produced by cells to act as catalysts (substances that initiate or speeds up chemical reactions without taking part in the reaction) for biochemical reactions. An example of an enzyme is lipase. This enzyme is produced in small intestines and pancreas. The enzyme is among a group of enzymes found in the digestive system and that aid in the breakdown of food. Lipase helps in catalyzing the breakdown of lipids (fats and oils) in the small intestines into fatty acids and glycerol.
One advantage of having metabolic pathways in the cell is that the pathway facilitates a continuous process of converting food substrates into intermediate products and then into final products (Starr, Evers, & Starr, 2011). There is greater control over the entire series of reactions since once the final substrate is reached, a feedback mechanism occurs to stop the processes. The feedback mechanism involves stopping the enzymes catalyzing the initial reaction. The second advantage of metabolic pathways is that it allows for making of complex molecules (Starr, Evers, & Starr, 2011). The continuous process allows for a series of sophisticated reactions leading to the formation of complex molecules. The third advantage is that metabolic pathways allow for the intermediate products or molecules to be used in other pathways (Starr, Evers, & Starr, 2011). This quickens the pact of converting initial substrates into final products.
Reference
Starr, C., Evers, C. A., & Starr, L. (2011). Biology: A human emphasis. Belmont, CA: Brooks/Cole Cengage Learning.
