Residents of three villages with three different types of water supply were asked to participate in a study to identify individu
als who were cholera carriers. Because there had been several recent deaths due to cholera, almost everyone participated in the study and underwent examination and testing. The proportion of residents in each village who were carriers was computed and compared. What is the proper classification for this study? a. Cross-sectional studyb. Case-control studyc. Prospective cohort studyd. Retrospective cohort studye. Experimental study
The correct answer is option a. "Cross-sectional study".
Explanation:
A cross-sectional study is a type of observational study used in medical and social researches. Cross-sectional studies are characterized by the analysis of data that comes from a population at a specific point of time. A research that involves studying the incidence of cholera carriers at three different villages with three different types of water supply, is an example of a cross-sectional study.
<span> Enzymes are usually proteins but some also contain nucleic acids (RNA in particular) and the list of chemical reactions that are catalyzed by RNA has been expanding. So the answer is proteins.</span>
Its been used by humans to take the best traits from a species and pass them on like bigger bodies in cows for more meat and bigger muscles in horses for faster racing potential.
