Drexel BIO 221 - MT1 Questions with Complete Solutions

Drexel BIO 221 - MT1 Questions with Complete Solutions Definition of a cell - Correct Answer A dynamic entity that forms the fundamental unit of life. Six features/properties of cells (living organisms) - Correct Answer Metabolism: Chemical transformation of nutrients Tons of important actions in a cell require having a metabolism Reproduction: Generation of two cells from one Differentiation: Synthesis of new substances or structures that modify the cell Only in some microbes Communication: Generation of, and responding to, chemical signals Only in some microbes Ex: quorum sensing Movement: Via self propulsion, many forms in microbes Flagella in euks and proks, cilia only in euks Evolution: Genetic changes in cells that are transferred to offspring Microbial communities - Correct Answer Populations in which microorganism exist in where they interact Habitat - Correct Answer The environment in which a microbial population lives in Ecosystem - Correct Answer All living organisms plus physical and chemical constituents of their environment How microbes can change the properties of their habitat - Correct Answer Consumption of resources and excretion of metabolites Examples of beneficial and harmful effects of microbes on humans presented in the lecture - Correct Answer Microbial disease agents: most are no longer relevant since we have a better understanding of how to avoid them Influenza and pneumonia Tuberculosis Gastroenteritis Infant diseases Diphtheria Microorganisms for good Microbes in agriculture: Nitrogen fixing bacteria Cellulose-degrading