In our Biology classes we started working on macromolecules. In this case, we were split into three groups, each group was assigned with one molecule. I had to work with Catu, Rochi, Epi, Juani, Pancho and Nico. Our macromolecules was proteins.
In Biology, in the past few classes, we’ve been studying and learning about some of the most important biomolecules: carbohydrates, proteins and lipids. Then, we had to confiscate a chart comparing these 3. I worked with Rochi Hartmann and Bauti Olaizola.
Carbon, hydrogen and oxygen
Carbon, hydrogen and oxygen
Carbon, nitrogen, hydrogen and oxygen
Monosaccharides, disaccharides and oligosaccharides
Fatty acids + glycerol
All solubles except from oligosaccharides that are not soluble
Some are soluble (ex: haemoglobin) and others are not (ex: keratin)
Provide energy to respire, regulate blood glucose and use proteins in other beneficial ways
Act as insulators, a source of energy and also are used as storage for energy
Help cell growth and makes new ones. It’s a source of energy. Proteins also repair tissues and produce enzymes
Benedict solution. We have to test for reducing sugars. We carry out this test by adding the benedict reagent to a food sample and then heat it up. If sugars are present then an orange/red colour will appear.
Ethanol emulsion. We first chop the food sample and put it into a test tube. We then add ethanol and shake it up. If a milky emulsion appears at the top of the mixture, then lipids are present.
Biuret Solution. We add some drops of the biuret reagent to our food sample and if a purple color appears then proteins are present, if not the mixture will remain the same.
Bread, sugar, pasta
Oil, avocado and butter
Egg, meat and soya
We also had to search for a definition for HYDROLYSIS and we came up with this:
Definition: Hydrolysis is the break-down of a component because of its reaction to water. – Hydrolysis is the opposite of condensation. In the last one, two molecules join together into a larger one and eject a water molecule. Hydrolysis adds water to break down, whereas condensation builds up by removing water.
Male, our Biology teacher divided the class into groups and assigned different drugs to do presentations on to each of them. I worked with Catu, Flor, Rochi and Pancho. We had to present tobacco. Here’s the poster we made:
3. ADRENALINE. State the effects of adrenaline. Chose a picture which shows a situation in which adrenaline is secreated. Explain.
Adrenaline is when you are frightened, excited or keyed up. There your brain sends impulses along a nerve to your adrenal glands, and these secrete adrenaline into the blood. The main effects of adrenaline are: Your hearts beats faster, your breathing rate increases, your pain body’s ability decreases and it causes a noticeable increase in strength and performance.
Lately we have been learning about the nervous system, during the last classes we saw the eye structure. Now our teacher Male Ravagnan asked us to do some activities about the pupil reflex and accomodation. (TASK)
For our Biology class, our teacher, Male, gave us a worksheet with some questions for us to answer to revise the topic of excretion and kidneys.
1) a) Define the terms excretion and egestion
Excretion as removal from organisms of the waste products of metabolism (chemical reactions in cells including respiration), toxic materials, and substances in excess of requirements.
Egestion as the passing out of food that has not been digested or absorbed, as faeces, through the anus
1) b) The kidney is an excretory organ. It produces urine that contains urea. State where in the body urea is formed and what is formed from.
Urea is expelled from of the kidneys, and it is made out of the excess of water and salts.
Anaerobic respiration produces an oxygen debt. This is the amount of oxygen needed to oxidise lactic acid to carbon dioxide and water. The existence of an oxygen debt explains why we continue to breathe deeply and quickly for a while after exercise.
4- Search in the internet a short video, which explains why the breathing rate does not return to normal immediately after vigorous exercise stops.