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.

Therefore, the Correct Answer is C.

Q #1: 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
Q #2: Metabolism of proteins Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

A. Sebum

B. Urea

C. Lysozymes

D. Water

Answer Explanation

Proteins are nitrogen-based compounds, which when broken down release ammonia. Ammonia is a toxic substance to the body, and sebaceous glands coverts it to urea.
Q #3: Which of the following processes does atmospheric pressure play a role in?

A. Pulmonary Ventilation

B. Photosynthesis

C. Osmosis

D. Evaporation

Answer Explanation

Among the choices provided, only one process is directly influenced by atmospheric pressure:

Pulmonary Ventilation (Correct): Pulmonary ventilation, also known as breathing, is driven by pressure differences between the lungs and the atmosphere. Atmospheric pressure plays a pivotal role in this process by facilitating the movement of air into and out of the lungs.

The other options mentioned in the choices—Photosynthesis, Osmosis, and Evaporation—are not primarily influenced by atmospheric pressure. While atmospheric pressure can indirectly affect certain aspects of these processes, it is not a dominant factor in their mechanisms.

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

More Questions on TEAS 7 Science

Q #1: 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?

Answer Explanation

Q #2: Metabolism of proteins Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

Answer Explanation

Q #3: Which of the following processes does atmospheric pressure play a role in?

Answer Explanation

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