Question 7 (3 points) What percent of energy is transferred between the levels indicated by the blue arrows? (3 points)
a
50 percent
b
90 percent
Ο Ο Ο Ο
С
100 percent
d
10 percent

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.

What is the ratio of carbon hydrogen and oxygen in a carbohydrate?