Base your answer on the graph and on your knowledge of biology. Which is a true statement about the relationship between pH and enzyme action?

A. All enzymes work best at a neutral pH.

B. Adding more acid does not affect the rate of activity of an enzyme.

C. Enzymes function only in a pH range of 4.0 to 5.5.

D. The activity of an enzyme is affected by pH.

Answer Explanation:

Therefore, the Correct Answer is D.

Q #1: Gel electrophoresis To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

A. Filtration

B. Titration

C. Electrophoresis

D. Spectrophotometry

Answer Explanation

Electrophoresis is a lab method that is commonly used to separate charge molecules based on their size. Some of the charged molecules include DNA, RNA, and proteins.
Q #2: Which of the following best describes the result of using a catalyst in a chemical reaction?

A. A more desirable product is often formed

B. The reaction is completed in a shorter amount of time

C. The yield of product is increased

D. A greater amount of energy is released by the reaction

Answer Explanation

A catalyst is substance that speeds up the rate of converting reactants to products. They do by decreasing the activation energy of a reaction. If a catalyst increases the rate of reaction, then it means that the reaction takes a smaller time to come into completion.
Catalysts can be metals, ions or biological also known as enzymes. Catalysts are not consumed when the reaction is taking place.
Q #3: Which of the following indicates the function of sodium bicarbonate released by the pancreas?

A. Sodium bicarbonate inhibits peristalsis

B. Sodium bicarbonate is a protease that digests carbohydrates

C. Sodium bicarbonate stimulates the pyloric sphincter

D. Sodium bicarbonate neutralizes the acidity of chyme

Answer Explanation

Sodium bicarbonate is an alkaline solution, which is released by the pancreas. Chyme is acidic coming from the stomach is neutralized by sodium bicarbonate to protect the duodenum.

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Base your answer on the graph and on your knowledge of biology. Which is a true statement about the relationship between pH and enzyme action?

More Questions on TEAS 7 Science

Q #1: Gel electrophoresis To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

Answer Explanation

Q #2: Which of the following best describes the result of using a catalyst in a chemical reaction?

Answer Explanation

Q #3: Which of the following indicates the function of sodium bicarbonate released by the pancreas?

Answer Explanation

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