One of the primary advantages of cell culture is the ability to isolate a single type of cell from a multicellular organism. how has this advance changed the study of biology? single-type cultures are easier and cheaper to maintain than cultures made of mixed cell types. scientists can completely avoid using animal or human test subjects during their experiments. cultures with single cell types behave in culture exactly as they would behave in a tissue or organ. scientists know that any response during an experiment is associated only with that cell type.

The population of bacteria in a petri dish doubles every 40 seconds. the population of the bacteria is initially 400 organisms. what unit is most appropriate for the time at which the number of bacteria is 300? hour bacteria per hour second bacteria per second

Of the pollutants that form acids in the atmosphere, which is easiest to reduce? a. sulfur dioxide b. nitrogen dioxide c. ozone d. carbon monoxide

Which of the following would be the best hypothesis for this experiment? a) use of the ginko biloba extract improves clinical outcomes when administered to patients with t2d. b) ginko biloba improves clinical outcomes of diabetes patients when combined with metformin. c) diabetes in patients is worsened when ginko biloba is taken in conjunction with metformin. d)the use of ginko biloba to treat t2d in combination with metformin lowers the cost of t2d treatment. ginko biloba shows benefits against t2d when combined with plant extracts as compared to other treatments.