BIO 103 Exam 1 Questions And Answers 2024 Graded A

cell theory - -all organisms are made up of cells (one or more) -all cells come from other cells What is a hypothesis? Give an example statement that is a hypothesis. - An educated guess about the reason for the phenomenon. Example(s): -Leaves reflect green light more than other wavelengths of light. -Leaves do not use green wavelength of light for photosynthesis. What is a theory? Give an example statement that is a theory. - A broad explanation of natural phenomena based on many observations. Example(s): -Chlorophyll absorbs blue and red wavelengths of light to perform photosynthesis. -Green wavelengths reflected causing leaves to appear green. What is a fact? Give an example of a fact. - An observation of a phenomenon in nature. Example: -Leaves of plants are green What is a law? Give an example of a law. - General statements about natural phenomena based on observations describing how variables are related. Example: Chlorophyll activity is directly proportional to the intensity of red and blue wavelengths of light absorbed and inversely proportional to the intensity of green wavelengths of light absorbed. What are the essential features or components of a properly designed experiment? - 1. Observe a phenomenon 2. Ask a question 3. Develop a hypothesis 4. Make predictions 5. Design an experiment to test the hypothesis 6. Implement the experiment and collect data 7. Analyze results 8. Interpret results with respect to the hypothesis What is a independent variable? Dependent variable? - The independent variable is the "cause" variable which means we can manipulate it or change it. The dependent variable is the "effect" variable which means that the response is measured the when independent variable changes (increases or decreases). What are the levels of treatment/independent variable? What about the number of replications? - The levels of an independent variable include experimental and control. The replication is the number of samples within each level of independent variable. What is a controlled variable? How is it different from a control? - A controlled variable is a variable that is kept constant. The control is the zero level of independent variable.