NCLEX : Other General Biology

Study concepts, example questions & explanations for NCLEX

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Example Questions

Example Question #61 : General Biology

Which of the following is the most biologically active form of estrogen?

Possible Answers:

Estrone

Estriol

Progesterone

Estradiol

Correct answer:

Estradiol

Explanation:

The most prevalent and biologically active estrogen in an adult female is estradiol (E2). Estrone and estriol are less active forms of estrogen, and progesterone is not a form of estrogen, but rather a distinct progestogen reproductive hormone.  

Example Question #362 : Nclex

What is the most prevalent form of circulating estrogen in a post-menopausal female?

Possible Answers:

Estriol

Estrone

Estetrol

Estradiol

Correct answer:

Estrone

Explanation:

After menopause, the most predominant form of circulating estrogen is estrone (E1). Estradiol is more prevalent in pre-menopausal women who are not pregnant, while estriol and estetrol are both only elevated during pregnancy.

Example Question #363 : Nclex

What form of estrogen is only present in pregnant females?

Possible Answers:

Estetrol (E4)

Estrone (E1)

Estriol (E3)

Estradiol (E2)

Correct answer:

Estetrol (E4)

Explanation:

The only form of estrogen that is exclusively present in pregnant women is estetrol (E4). 

Example Question #61 : Other General Biology

What enzyme is responsible for the conversion of androgens into estrogen?

Possible Answers:

5-alpha-reductase

Protease

Amylase

Aromatase

Correct answer:

Aromatase

Explanation:

The conversion of androgens into estrogen is performed by aromatase, also known as estrogen synthetase or estrogen synthase. 5-alpha-reductase is responsible for the conversion of testosterone to dihydrotestosterone. Amylase is a salivary enzyme that breaks down starches during mastication, and protease is a digestive enzyme that aids in the breakdown of proteins.

Example Question #62 : Other General Biology

Which cells in the male reproductive tract produce testosterone?

Possible Answers:

Sertoli cells

Spermatogenic cells

Leydig cells

Wolffian cells

Correct answer:

Leydig cells

Explanation:

Leydig cells, located in the testes adjacent to the seminiferous tubules, secrete testosterone in response to lutenizing hormone (LH). Sertoli cells are also adjacent to the seminiferous tubules. They play a role in stimulating spermatogenesis in spermatogenic cells. Wolffian cells are a part of the fetal male reproductive tract and do not produce testosterone. 

Example Question #371 : Nclex

Which of the following structures are formed from the embryological Wolffian ducts?

Possible Answers:

The vas deferens

All of these are correct

The seminal vesicles

The epididymis

Correct answer:

All of these are correct

Explanation:

The Wolffian ducts are fetal urogenital structures that develop into the seminal vesicles, the vas deferens, and the epididymis. They also form parts of the bladder wall.

Example Question #372 : Nclex

Which of the following is not an androgen?

Possible Answers:

Dihydrotestosterone 

Androstenedione

Dehydroepiandrosterone (DHEA)

2-Hydroxyestrone

Correct answer:

2-Hydroxyestrone

Explanation:

All of the hormones listed, and testosterone, are androgens except 2-hydroxyestrone, which is a metabolite of estrone (a form of estrogen).

Example Question #373 : Nclex

Androstenedione is produced by all of the following tissues except __________.

Possible Answers:

The testes

The ovaries

The adrenal cortex

The adrenal medulla

Correct answer:

The adrenal medulla

Explanation:

Androstenedione is produced by the ovaries, the testes, and the adrenal cortex. The adrenal medulla primarily secretes epinephrine and norepinephrine.

Example Question #61 : Other General Biology

Which of the following is a normal dehydroepiandrosterone (DHEA) level in an adult female under the age of fifty?

Possible Answers:

Correct answer:

Explanation:

Normal DHEA levels in an adult female under the age of fifty range from . DHEA levels are higher in younger women and decline as women approach menopause.

Example Question #70 : General Biology

Which of the following is a normal dehydroepiandrosterone (DHEA) level in an adult male under the age of fifty?

Possible Answers:

Correct answer:

Explanation:

The normal DHEA levels in an adult male under the age of fifty can range from . They are highest in early adulthood and decline with age.

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