Biomolecules and Protein Quiz GGN

What is the main function of a carbohydrate?

• Long term energy (ATP)

• Short term energy (ATP)

• Growth and repair

• Store genetic information

Answer explanation

Carbohydrates primarily serve as a source of short-term energy (ATP) for the body. They are quickly metabolized to provide immediate energy, unlike fats which are used for long-term energy storage.

The main function of lipids are:

• Storage of genetic material

• Long term energy (ATP)

• Growth and Repair

• Short term energy (ATP)

Answer explanation

Lipids primarily serve as long-term energy storage in the form of fats, providing a dense source of energy (ATP) for the body. They are not involved in genetic material storage or short-term energy.

Which of the following would be a food source of protein?

• Oil

• Strawberries

• Lettuce

• Poultry

Answer explanation

Poultry is a rich source of protein, essential for building and repairing tissues. In contrast, oil, strawberries, and lettuce contain minimal to no protein.

Tags

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What is the purpose  of an enzyme?

• give permission for the reaction

• raise activation energy

• speed up reactions

• control how many reactions occur

Answer explanation

The primary purpose of an enzyme is to speed up reactions by lowering the activation energy required for the reaction to occur, making processes more efficient.

Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   

• reducing the activation energy

• increasing the temperature of the cell

• increasing the concentration of reactants 

Answer explanation

Enzymes increase the rate of chemical reactions by reducing the activation energy required for the reaction to occur, making it easier for reactants to convert into products.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  

• The optimum pH of the enzyme is 5.8
  

• The enzyme’s activity increases as pH increases 5.0 to 9.0
  

• The enzyme’s activity is greater around pH of 8.0 .
  

Answer explanation

The graph indicates that the enzyme's activity peaks at a pH of 6.6, confirming it as the optimum pH. Other options either misstate the optimum pH or do not accurately reflect the enzyme's activity across the pH range.

The "lock and key hypothesis" attempts to explain the mechanism of?

• Vacuole formation

• Pinocytosis

• Sharing of electrons

• Enzyme specificity 

Answer explanation

The "lock and key hypothesis" describes how enzymes are specific to their substrates, fitting together like a key in a lock. This model illustrates the precise interaction necessary for enzyme activity, making "enzyme specificity" the correct choice.

An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 

• true

• false

Answer explanation

The statement is false because enzymes can be used multiple times in a reaction. They are not consumed in the reaction and can catalyze the same reaction repeatedly.

Tags

NGSS.HS-PS1-5

The pH at which an enzyme is most efficient is called the _________ pH of an enzyme.

• neutral

• optimum

• minimum

• experimental 

Answer explanation

The pH at which an enzyme is most efficient is referred to as the optimum pH. This is the specific pH level that allows the enzyme to function at its highest activity.

What is the following molecule?

• Carbohydrate

• Lipid

• Protein

• Nucleic Acid

Answer explanation

The molecule in question is a nucleic acid, which includes DNA and RNA. These macromolecules are essential for storing and transmitting genetic information, distinguishing them from carbohydrates, lipids, and proteins.

Tags

NGSS.HS-LS1-6