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Which of the following respiratory structures is affected by a disease that disrupts gas exchange, such as emphysema?

A. Trachea

B. Secondary branch

C. Primary bronchi

D. Alveoli

Answer Explanation:

Therefore, the Correct Answer is D.

Q #1: Which of the following molecules contains the fewest covalent bonds?

A. Chlorine molecule

B. Ammonia molecule

C. Methane molecule

D. Water molecule

Answer Explanation

A chlorine molecule contains the fewest covalent bonds among the options provided. It consists of two chlorine atoms bonded together by a single covalent bond. Compared with the other options, ammonia has three covalent bonds, methane has 4 while water has 2.
Q #2: Which of the following tools can be used to measure the turbidity of a liquid by measuring the transmission of light through the sample?

A. Spectrophotometer

B. Centrifuge

C. Electro photometer

D. Microdensitometer

Answer Explanation

A spectrophotometer is an instrument that measures the intensity of light absorbed after it passes through a sample solution. With the spectrophotometer, the concentration of a chemical substance can be determined by measuring the intensity of light detected.
Q #3: Which of the following is an example of a biological macromolecule?

A. Nucleic acid, Protein

B. Monosaccharide

C. Amino and

D. Protein

Answer Explanation

Biological macromolecules are large organic molecules such as carbohydrates, lipids, nucleic acids, and proteins. They are built from smaller molecules, which are linked commonly by covalent bonds, and these can be broken down.

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