Regulation Energy Processing Enter & Development Concept
- Themes connect the concepts of biology
- What are emergent properties? Give two examples. Properties that are not present at the preceding level. Reproduction
- Life is organized on many scales. As you study this figure, choose the correct label for each picture. Exosphere ecosystem ell organism organelle community tissue molecule population
- Our study of biology will be organized around recurring themes. Make a list here of the themes that are presented, and give an example that illustrates each theme. Watch for these themes throughout your study this entire year. This will help you see the big picture and organize your thinking. (Go to the Summary of Key Concepts at the end of the chapter for a concise look at the themes. )
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Theme 1 Example Organisms Interact with other organisms and the Physical Environment The leaves of a tree, for example, absorb light from the sun,
Theme 2: Life requires energy transfer and transformation
Theme 3: A fundamental characteristic of living organisms is their use of energy to carry out life's activities.
The Core Theme
Evolution accounts for the unity and diversity of life 5. Life is organized into groups. Which level contains the greatest diversity of organisms? The least?
Taxonomy is the branch of biology that names and classifies organisms. Because of new molecular information, there have been many changes in placement of certain groups in recent years.
Notice that all life is now organized in your text into 3 domains rather than the 5 kingdoms you may have learned earlier. Choose the kingdoms mentioned in the text in the space above the proper domain names shown here. Mammalian Protests 7. What two main points were articulated in Darning's The Origin of Species? 8. What did Darwin propose as the mechanism of evolution? Summarize this mechanism. Are the two main types of scientific inquiry? Give an example of each. 10. What is the difference between deductive and inductive reasoning? Is either used by scientists?
Distinguish between quantitative and qualitative data. Which type would be resented in a data chart and could be graphed? Which type is found in the field sketches made by Jane Goodwill? 12. In science, how do we define hypothesis? 13. A scientific hypothesis has two important qualities. The first is that it is testable. What is the second? 14. Look at Figure 1. 24. Use it to write a hypothesis using the "If .. . Then .. ." Format. 15. What is a controlled experiment? 16. The text points out a common misconception about the term "controlled experiment". In the snake mimicry experiment, what factors were held constant? 7. Explain what is meant by a scientific theory by giving the three ways your text prepares a theory from a hypothesis or mere speculation.
The Chemical Context of Life
This chapter covers the basics that you may have learned in your chemistry class. The questions that follow should help you focus on the most important points. Matter element trace element neutron atomic number atomic mass energy polar covalent bond anion compound proton isotope electronegative action dynamic equilibrium essential element electron electron shells monopoly covalent bond hydrogen bond. Matter consists of chemical elements in pure form and in combinations called compounds. An element's properties depend on the structure of its atoms
Now, refer back to your definition of a compound and fill in the following chart: Molecule? (y/n) Compound? (y/n) Molecular Formula Water Carbon dioxide Methane Structural Formula
In the preceding example, which is the anion? 18. Indicate where the hydrogen bond occurs in this figure. Hydrogen 19. Here is a list of the types of bonds and interactions discussed in this section. On the chart: hydrogen bonds, van deer Walls interactions, covalent bonds, ionic bonds. Van deer Walls interactions 20. What is the biological importance of weak bonds? 21 . Use morphine and endorphins as examples to explain why molecular shape is crucial in biology. Concept 2. 4 Chemical reactions make and break chemical bonds 22. Write the chemical shorthand equation for photosynthesis. Label the reactants and the products. 23.
For the equation you Just wrote, how many molecules of carbon dioxide are there? How many molecules of glucose? How many elements in glucose?
Water and the Fitness of the Environment
Polar molecule specific heat solute pH cohesion evaporation hydrophilic acid adhesion solvent hydrophobic base Concept 3. 1 The polarity of water molecules results in hydrogen bonding 1. Why is water considered polar? 2. How many hydrogen bonds can a single water molecule form? Concept 3. 2 Four emergent properties of water contribute to Earth's fitness for life Hydrogen bonding accounts for the unique properties of water. Let's look at several.
Cohesion 3. What is demonstrated when you see beads of water on a waxed car hood? Calorie solution military . Which property explains the ability of a water strider to walk on water? Moderation of Temperature 5. Water has high specific heat. How does water's specific heat compare to alcohol's? 6. Explain how hydrogen bonding contributes to water's high specific heat. 7. Summarize how water's high specific heat contributes to the moderation of temperature. How is this property important to life? 8. What is heat of vaporization? Explain at least three effects of this property on living organisms. Expansion upon Freezing 9. Ice floats!
So what? Consider what would happen if ponds and other bodies of water accumulated ice at the bottom. Describe why this property of water is important. 10. Now, explain why ice floats. Why is ICC the critical temperature in this story? Solvent of Life 1 1 . Consider coffee to which you have added sugar. Which is the solvent? The solute? 12. Explain why water is such a fine solvent. 13. You already know that some materials, such as olive oil, will not dissolve in water. In fact, oil will float on top of water. Explain this property in terms of hydrogen bonding. 14. Now, let's do a little work that will enable you to prepare solutions.
Read the section on solute concentrations carefully, and show the calculations here for repairing a I-molar solution of sucrose. Steps to help you do this follow. The first step is done for you. Fill in the rest. Steps to prepare a solution: a. Write the molecular formula. B. Use your periodic table to calculate the mass of each element. Multiply by the number of atoms of the element. (For example, O has a mass of 16. Therefore one mole of O has a mass of 16 x 11 = 176 g/mole. ) masses of each element in the molecule.
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