A Prophylactic Trial Is Designed To

question 23

Multiple Choice

A prophylactic trial is designed to:

• A) compare rates of disease, death, and recovery in a population.
• B) measure how well drugs produce improvement in a patient's illness.
• C) evaluate the effectiveness of a substance used to prevent disease.
• D) estimate the impact of exposure on the incidence of disease.

---

Definitions:

Megaspore

A type of spore in some plants that develops into a female gametophyte, distinguished by being larger than other types of spores, such as microspores.

Female Gametophyte

The gamete-producing structure in plants and algae that develops into the female gamete.

Embryo Sac

Female gametophyte (megagametophyte) of flowering plants.

Polar Nuclei

Two nuclei in the embryo sac of flowering plants that fuse with a sperm cell to form the endosperm, nourishing the developing embryo.