Biology Marshall Homework

HOMEWORK:

ASSIGNMENT PG 160 6.2 Assessment Write the questions. Draw the chemical reaction and label 1, 3, 4, 5

Marshall Biology

Chapter 6-2, 7-4

OBJECTIVE:

Understand how the body regulates its functions.

Chemical Change (Reaction)

When an atom or a group of atoms are reorganized into a new substance

TWO PARTS OF A CHEMICAL CHANGE:

·       Reactant:

·       Product:

o   The result of something

Reactant à Product                                                         (à YIELD)

Glucose + Oxygen à Carbon Dioxide + Water

C₆H₁₂o₆ + O₂ à CO₂ + H₂O

BALANCE AN EQUATION:

Coefficient: Number used to balance an equation

Activation Energy (pg159)

The least amount of energy needed for a reaction to take place.

NOTE: Enzymes are catalysts, but catalysts are not always enzymes.

Catalysts

Are used in laboratories to help chemical reactions take place. It lowers the activation energy

Enzymes

Are used in the body to catalyze (make a chemical reaction take place)

What is the best enzyme on this earth? Water

·       What are Enzymes?

Globular (you can recycle them) proteins that catalyze chemical reactions in living organisms (proteins that you can use over and over again)

§  Properties of Enzymes:

·       Specific: used for a specific thing

·       They increase the rate of the reaction

·       They are unchanged at the end of the reaction (after your body uses it)

·       Why do we need them?

o   Reactions are too slow to maintain life

o   Can’t increase temperatures/pressures in cells (fatal)

·       Name some examples:

o   Enzymes ARE PROTEINS… PROTEINS ARE ENZYMES

§  The enzyme binds to the substrates by its active site (where the two parts meet)

·       The active site

o   Is a pocket formed by the folding of the protein where the substrates bind.

ASSIGNMENT PG 160 6.2 Assessment Write the questions. Draw the chemical reaction and label 1, 3, 4, 5