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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 contains a human's hereditary information?

A. chromatin

B. Histones

C. ATP

D. Plasmids

Answer Explanation

Rationale

Chromatin refers to a complex of DNA and proteins in human cells. This material is packaged by histones to make up the chromosomes. The chromosomes then contain genetic information that is heritable.
Q #2: Which of the following atoms is most likely to become a cation?

A. Oxygen, atomic number 8

B. Fluorine, atomic number 19

C. Helium, atomic number 2

D. Fluorine, atomic number 9

Answer Explanation

Fluorine has a high electronegativity, and therefore, it has a strong attraction for electrons and tends to gain electrons to form anions. Therefore, it is more likely to become a cation by losing an electron.
Q #3: Which of the following distinguishes endocrine and exocrine glands from another?

A. The presence or absence of ducts

B. The effect their secretions have on the target cells

C. The biochemistry of their secretions

D. The presence or absence of nerve innervation

Answer Explanation

Exocrine glands secrete their products into ducts that carry them to the target organs. In contrast, endocrine glands secrete their products directly into the bloodstream, which carries them to target cells throughout the body.

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