Proteins have a number of functions in living organisms.
Structural proteins such as collagen in animal connective tissue and keratin in hair, horns and feather quills, all provide support.
Storage proteins such as albumin in egg white provide a source of energy. Plants store proteins in their seeds to provide energy for the new growing plant.
Transport proteins transport other substances in the body. Haemoglobin in the blood for example, is a protein that contains iron. Haemoglobin has an affinity (attraction) for oxygen and so this is how oxygen is transported around the body in the blood.
Hormonal proteins coordinate the body's activities. Insulin for example, is a hormonal protein that controls the sugar levels in the blood.
Enzymes are chemical catalysts and speed up chemical reactions. Digestive enzymes such as amylase in your saliva, help to break down polymers in food. Enzymes play an important role in all cellular reactions such as respiration, photosynthesis and many others.
Research project : macromolecules in our daily diet
In order to keep our bodies healthy, it is important that we eat a balanced diet with the right amounts of carbohydrates, proteins and fats. Fats are an important source of energy, they provide insulation for the body, and they also provide a protective layer around many vital organs. Our bodies also need certain essential vitamins and minerals. Most food packaging has a label that provides this information.
Choose a number of different food items that you eat. Look at the food label for each, and then complete the following table:
Food
Carbohydrates (%)
Proteins (%)
Fats (%)
Which food type contains the largest proportion of protein?
Which food type contains the largest proportion of carbohydrates?
Which of the food types you have listed would you consider to be the 'healthiest'? Give a reason for your answer.
In an effort to lose weight, many people choose to
diet . There are many diets on offer, each of which is based on particular theories about how to lose weight most effectively. Look at the list of diets below:
Vegetarian diet
Low fat diet
Atkin's diet
Weight Watchers
For each of these diets, answer the following questions:
What theory of weight loss does each type of diet propose?
What are the
benefits of the diet?
What are the potential
problems with the diet?
Carbohydrates and proteins
Give the structural formula for each of the following:
A polymer chain, consisting of three glucose molecules.
A polypeptide chain, consisting of two molecules of alanine and one molecule of serine.
Write balanced equations to show the polymerisation reactions that produce the polymers described above.
The following polypeptide is the end product of a polymerisation reaction:
Give the structural formula of the monomers that make up the polypeptide.
On the structural formula of the first monomer, label the amino group and the carboxyl group.
What is the chemical formula for the carbon side chain in the second monomer?
Name the bond that forms between the monomers of the polypeptide.
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
