Anybody good at science? :)?

Question

ino this sounds bad but can someone help me with my science homework?

here are the questions i don't know lol.

1.Does HCl digest protein by itself? How do you know?

2.What kind of conditions does pepsin need to work the best? Why should this be so? Where are these conditions found in digestive tract?

3.Pepsin is an enzyme. What are enzymes?

4.Of which smaller molecules are proteins made?

ten points for who can help me :)

i suck at science lol

pleeeease help if u can

thanks

Answer 1

The answers are always in the book.  If you go to the back of your science book there's an Index.  Just look up the main word like enzymes and it will give you the page the information is on.  Important stuff is always highlighted as in the print will be darker or larger.  Teachers also get questions from the information in the boxes on a page.  The questions are usually in the order of the chapters.  Learn these short cuts and school will be a lot easier.  

Answer 2

1. The primary role of HCl is to break down large chunks of protein into smaller chunks so that the digestive enzymes can get to work.  If these large chunks were not broken down, there wouldn't be sufficient surface area for the enzymes to function on the protein chunks and very little digestion would take place (it would happen very slowly).

2. Pepsin functions best in an acidic environment. This is because it is stored as pepsinogen (so it won't digest the body's own proteins) and needs an acidic environment to unfold and cleave properly.  This type of environment is found in the stomach.

3. Enzymes are substances that catalyze (increase the rate of) chemical reactions.  Almost all enzymes are proteins.

4. Proteins are made of amino acids.

Answer 3

1 No. By the book

2 Acidic. Pepsinogen has to be converted into pepsin by acid. In stomach

3 Biological catalyst

4 Amino acids

Give me my points, the answers are concise and to the point

Answer 4

3. enzymes are digestive proteins (breakdown products into substrates) and they speed up a reaction by lowering the activation energy needed for a rxn to occur. enzyme binds to the product at the active site, forming an induced fit.  and yes, pepsin is a enzyme in the stomach that has a pH of 2. if change in temperature or pH occur the enzyme (like all enzymes) denature- after a certain point.

4. amino acids

i don't know about question 1 and 2