BIO 103 Exam 1 Questions and Answers Already Passed

BIO 103 Exam 1 Questions and Answers Already Passed What principle explains that every living organism is composed of cells, and cells can only come from other cells? cell theory How would you define an educated guess made to explain a phenomenon? Provide an example. A hypothesis. Example: -Leaves reflect green light more than other colors. -Leaves do not utilize green light for photosynthesis. What term describes a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence? Provide an example. A theory. Example: -Chlorophyll absorbs blue and red light to conduct photosynthesis. -Green light is reflected, making leaves appear green. What do you call a consistent and observable phenomenon in nature? Provide an example. A fact. Example: -Leaves of plants are green. What term is used for general statements about natural phenomena based on repeated observations that describe how variables are related? Provide an example. A law. Example: -The activity of chlorophyll is proportional to the intensity of red and blue light absorbed and inversely proportional to the green light reflected. What steps are involved in conducting a scientific experiment properly? 1. Observe a phenomenon 2. Formulate a question 3. Develop a hypothesis 4. Make predictions 5. Design and conduct an experiment to test the hypothesis 6. Collect and analyze data 7. Draw conclusions and interpret results based on 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