Biol 1001 Lesson 1

Biol 1001 Lesson 1 - Jonathan Morris Biol 1001 639173...

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Jonathan Morris Biol 1001 639173 Lesson 1 The Nature of Molecules: The Chemical Basis of Life 1. Explain how ionic, covalent, and hydrogen bonds form and how they differ. Give an example of each. Ionic bonding is that bond that forms when ions of opposite charge attract to one another. An example of ionic bonding would be salt, NaCl. Covalent bonding is when two or more elements share one or more electron pairs to from a molecule, H2, is an example of this. Hydrogen bonding is the bond that is formed when a positively charged hydrogen atom of a molecule attracts negatively charged regions on surrounding molecules. Water being a polar bond is a good example of this. 2. List the three domains, naming one diagnostic feature for each. List the four kingdoms under Eukarya, and name a diagnostic characteristic for each. Bacteria – consists of organisms with prokaryotic cells Archaea – most organisms are unicellular and microscopic Eukaryotes – organisms with eukaryotic cells Protists – mostly single – celled organisms Plantae – produce own food by photosynthesis Fungi – decomposers that break down the remains of dead organisms Animalia – eat other organisms 3. Use the scientific method to prove that brand “X” dishwashing detergent is better than brand “Y”. Be sure to include observations, hypothesis, experimentation, hypothetical results. List your variables. My observation is that the dishes are dirty and need to be cleaned. I have two different brand detergent, brand “X” and brand “Y”. I believe that brand “X” will work better than brand “Y”. To test this I would first have run the dirty dishes
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Jonathan Morris Biol 1001 639173 through the dishwasher without any detergent. This would be the control of my experiment. Next I will run brand “X” on the dirty dishes and observe the results. Then I would run brand “Y” on some dirty dishes and take into account the difference in cleanliness. After my experiment I come to the conclusion that brand “Y” actually worked better. My two variable were brand “X” detergent and brand “Y” detergent. 4. How do bases differ from acids? Why is acid rain an environmental concern and most pronounced in the spring? Bases obtain hydrogen atoms from a solution while acids donate them. Acid rain kills many types of organisms including plants and animals and destroys their habitat. It occurs more in spring because the snow melts and drains down to lakes and streams bringing with it the acid that has accumulated all winter. 5. How is an isotope formed? List two positive uses and two negative uses of specific isotopes. Isotopes are formed when an element retains the same number of protons and electrons but gains or loses neutrons. Two positive uses of isotopes are in biological research and medicine. A negative uses would be uncontrolled exposure to isotopes due to an nuclear plant explosion. Another negative effect would be natural radiation that can pose serious health issues such as cancer. 6.
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Biol 1001 Lesson 1 - Jonathan Morris Biol 1001 639173...

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