Bio 111 test #1 Questions With Correct Answers.

What are the distinguishing characteristics of living things? - Answer-All life shares five characteristics. #1 Biological levels of organization -Protons,neutrons,electrons form atoms -Atoms combine to make molecules -Molecules make up parts of cells -Cells create tissues (if multicellular) - Tissues together make organs - Organs and organ sytems make up organisms (unless unicellular) List the levels of life's organizational hierarchy from smallest to largest(Biological levels of Organization) - Answer-Atom Molecule Organelle Cell Tissue Organ Organ system Oganism Popuation Community Ecosystem Biosphere How can natural selection and mutation play a role in evolution? - Answer-Natural Selection = those individuals with the greatest fitness (fitness= reproductive and survival success) What are the distinguishing characteristics of the 3 domains of life? - Answer-Domain bacteria. No nucleiDomain Archea-No nuclei Domain Eukarya-Have cells with nucleus How organisms are classified and named? (Biological levels (hierarchy) of Classification) includes class - Answer-Domain Kingdom Phylum Class Order Family Genus Species What are the steps in a controlled scientific experiment? - Answer-Observatiions Hypothesis Experiment (test collect data) Analyses of data Conclusions 1. Describe the difference between a hypothesis, scientific theory, and scientific law. - Answer-A scientific theory is NOT a wild guess. It must be consistent with known experimental results and it must have predictive power. As new knowledge is gained, theories are refined to better explain the data. A law is a mathematical relationship that is consistently found to be true. What are the four most common elements (atoms) found in living organisms? - Answer-Chon Describe the structure of an atom. - Answer-Contains protons, neutrons, and electrons.What are the 3 types of chemical bonds formed between atoms and molecules? - Answer-Hydrogen bonds, Ionic bonds, and covalent. What chemical properties of water are essential to life on earth? - Answer-Cohesion is the tendency of water molecules to stick to one another, due to hydrogen bonding between water molecules. Adhesion sticks to other things Describe the pH scale and be able to give examples of acids, bases and neutral substances. - AnswerAcidic solutions have a low pH and a high H+ concentration. Basic solutions have a high pH and a low H+ concentration. Bases have more OH- ions than H+ ions. Acids examples. Lemons and Soda Neutral Examples Milk, Saliva and water Base Bleach and ammonia