Biology Biochemistry

In living cells, enzymes act as catalysts, which may reduce the amount of activation energy required for a chemical reaction to occur. In the graphs below, pathway x is a solid line representing the uncatalyzed reaction. The dotted line shows the catalyzed reaction. Which graph best illustrates the changes in a reaction when the catalyst reduces the amount of energy required?

• A

• B

• C

• D

Answer explanation

Both lines begin at the same level but the catalyzed reaction shows a decrease in the activation energy...

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The diagram shows the general structure of an amino acid. Which type of molecule is formed from amino acids?

• lipids

• proteins

• carbohydrates

• nucleic acids

Answer explanation

Amino Acids are the MONOMERS for building Proteins...

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What will most likely happen if an appropriate enzyme is added to a chemical reaction?

• The reaction rate will increase.

• The equilibrium of the reaction will be maintained. 

• The reaction rate will decrease.

• The reaction will stop.

Answer explanation

Enzymes speed up reactions by decreasing the activation energy...

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A sugar, a phosphate group, and a nitrogen base form the building blocks of which organic compound?

• carbohydrates

• lipids

• nucleic acids

• proteins

Amino Acids:

• are a type of marinade.

• help transport fats in the body.

• are the building blocks from which proteins are made.

• are only found in plants.

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How many different amino acids are there?

• 10

• 18

• 20

• Thousands

Which is one characteristic of non-essential amino acids?

• They are not required for essential bodily processes.

• They are required from a healthy diet.

• They can recycle nitrogen from a healthy diet.

• They can be synthesized by the human body.

What are essential amino acids?

• Amino acids that control essential functions like respiration

• Amino acids that are more abundant than non-essential amino acids

• Amino acids that every biological molecule contains

• Amino acids that are cannot be made by the body

Amino Acids

• Building blocks of proteins

• Fossils of soft-bodied Proterozoic organism

• Deepest, most stable part of a continent

• Hot water vent at volcanic seafloor rift

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Amino acids are the building blocks of... 

• DNA

• RNA

• Atoms

• Proteins

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