Biology Praxis Exam 5235 Study Set with Questions and Answers

how do scientists make observations Scientists are naturally curious about the world. Thoughts are taken note of and further investigated Steps of scientific inquiry -Make an Observation -Form a Question -Form a Hypothesis -Conduct Experiment -Analyze the Data and Draw Conclusions What is a hypothesis an informed guess as to the possible answer. Can be used for further scientific investigation Controls/constants unchanged. Used as base for comparison of variables Variable/experimental group receives intervention and compared to control group. Independent variable intentionally introduced to the variable group in an experiment Dependent variable the resulting change in the variable group that is caused by introduction of the independent variable. Proof vs. support How do scientists communicate findings Giving talks, writing papers and proposals, communicating with a variety of audiences, and educating others. What is matter? anything that has mass What is an atom made up of electrons, protons and neutrons What is an isotope different neutron numbers Example of isotopes 13C vs. 14C Difference between ionic and covalent Ionics: gives, accepts, donates (eg. NaCl) Covalent: shares (eg. H2O) Difference between solutions, suspensions, colloids a.Solution: homogenous