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What are enzymes and what are they made of?
Enzymes are biological catalysts. This means they break down substances without being changed themselves. This is why they can be used over and over again. Enzymes are made from amino acids joined together by different bonds, one of the type of bonds being hydrogen bonds. As enzymes have hydrogen bonds it means they are sensitive to pH and temperature. A temperature too low will mean that the molecules (substrate) which should fit to an area on the enzyme called the active site cannot do so as hydrogen bonds are stronger in colder conditions. (Enzymes change slightly as the substrate fits on to it) This would mean that the enzyme is less able to change shape slightly because the stronger hydrogen bonds make the enzyme less flexible. Temperatures which are too high for the enzyme (if they exceed the perfect temperature, called the optimum temperature, of the enzyme) denature the enzymes, meaning that they are unable to catalyse chemical reactions, this is due to the high temperature causing the hydrogen bonds which bond the amino acids together to beak, causing the enzymes active site to change shape, meaning that the substrate can no longer fit into the active site meaning that the rate of reaction of the chemical reaction is lower. There is a point when the hydrogen bonds, once broken, are no longer able to re-bond, meaning the enzyme could never "re-nature". This is very bad if the chemical reaction is necessary. If the pH which the enzyme is exposed to is not its optimum the rate of reaction will be slower as the pH changes the molecular shape of the enzyme, and can have an effect on the intermolecular forces of the Hydrogen bonds (it can weaken or strengthen them)
Where does a physical change takes place?
When a physical change takes place, a certain element or chemical will change its shape and in many cases, the volume too. Water takes the shape of the mold casing once it freezes.
When enzymes are placed in extreme pH or temperature conditions they unwind and change shape This is called what?
The enzyme 'denatures'
What 4 factors can change the protein shape?
pH, temperature, presence of inhibiting proteins
When a substance undergoes a phase change it still has a definite A mass B shape C volume D temperature?
mass - the mass does not change
Can solid change it shape?
Yes, It can change... To be a liquid or a gas :)OR by applying forces..... Yes it can change its shape by the alteration of temperature.
What causes sediment to change in size and shape?
temperature
What is the term used for a change in a protein's three dimensional shape or confirmation due to disruption oh hydrogen bonds disulfide bridges or ionic bonds?
The change in a proteins' three dimensional shape or conformation is called denaturation.
What makes the lens in your eye change shape?
Increased water pressure can change the shape of your eye. If this happens, it is always an indicator to get your eyes checked professionally.
At what temperature does rennin work best?
The Kinetic Theory states that with increased temperature, molecules receive more energy, resulting in them speeding up their movement. If the milk and the rennin molecules are moving faster, they will collide more often. The collisions will also have more energy so more of them are successful. Therefore the rate of reaction increases. However, above 37°C rennins optimum temperature, the rate of reaction will decrease. This is because the rising temperature affects the hydrogen and ionic bonds which determine the shape of the enzyme. As these bonds are broken the shape of the active site changes and the molecules.
How does a large change in temperature or pH affects proteins?
They come apart and lose there shapeA large change in temperature or ph will cause protiens to come apart and lose their shape.
What determines the shape of proteins?
The sequence of amino acids. The chemical bonds between amino acids, and temperature and ph. and its environment
What is Shape memory effect?
the change of shape of a metal at low temperature by loading and regaining of original shape by heating it,is known as shape memory effect
What are enzymes and what are they made of?
Enzymes are biological catalysts. This means they break down substances without being changed themselves. This is why they can be used over and over again. Enzymes are made from amino acids joined together by different bonds, one of the type of bonds being hydrogen bonds. As enzymes have hydrogen bonds it means they are sensitive to pH and temperature. A temperature too low will mean that the molecules (substrate) which should fit to an area on the enzyme called the active site cannot do so as hydrogen bonds are stronger in colder conditions. (Enzymes change slightly as the substrate fits on to it) This would mean that the enzyme is less able to change shape slightly because the stronger hydrogen bonds make the enzyme less flexible. Temperatures which are too high for the enzyme (if they exceed the perfect temperature, called the optimum temperature, of the enzyme) denature the enzymes, meaning that they are unable to catalyse chemical reactions, this is due to the high temperature causing the hydrogen bonds which bond the amino acids together to beak, causing the enzymes active site to change shape, meaning that the substrate can no longer fit into the active site meaning that the rate of reaction of the chemical reaction is lower. There is a point when the hydrogen bonds, once broken, are no longer able to re-bond, meaning the enzyme could never "re-nature". This is very bad if the chemical reaction is necessary. If the pH which the enzyme is exposed to is not its optimum the rate of reaction will be slower as the pH changes the molecular shape of the enzyme, and can have an effect on the intermolecular forces of the Hydrogen bonds (it can weaken or strengthen them)
Does temperature affect a proteins shape?
It absolutely does. All proteins have optimum temperatures at which they are able to operate. Temperatures unsuitable for the proteins may cause it to denature into smaller peptides, or simply change shape due to the alteration of bond energies, resulting in broken or reformed bonds elsewhere in the amino chain.
What is the kind of matter that can change in shape but not volume?
Liquids. By assuming that temperature and pressure are constant so that volume does not change.
Can a solid shape change?
Yes, a solid shape can change. If the heat rises above a certain temperature that which a solid can handle (the melting point) than the solid begins a physical change into a liquid.
