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Q&A Ch. 2
Biology Q&A Chapter 2
| Question | Answer |
|---|---|
| What three subatomic partials make up an atom? | The subatomic particles that make up atoms are protons, neutrons, and electrons. |
| How are all of the isotopes of an element similar? | Because they have the same number of electrons, all isotopes of an element have the same chemical properties. |
| In what ways do compounds differ from their component elements? | The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed. |
| What are the main types of chemical bonds? | The main types of chemical bonds are ionic bonds and covalent bonds. |
| How does the structure of water contribute to its unique properties? | Because water is a polar molecule, it is able to form multiple hydrogen bonds, which account for many of water's special properties. |
| How does water's polarity influence its properties as a solvent? | Water's polarity gives it the ability to dissolve both ionic compounds and other polar molecules. |
| Why is it important for cells to buffer solutions against rapid changes in pH? | Buffers dissolved in life's fluids play an important role in maintaining homeostasis in organisms. |
| What elements does carbon bond with to make up life's molecules? | Carbon can bond with many elements, including hydrogen, oxygen, phosphorus, sulfur, and nitrogen to form the molecules of life. |
| What are the functions of each of the four groups of macromolecules? (Carbohydrates) | Living things use carbohydrates as their main source of energy. Plans, some animals, and other organisms also use carbohydrates for structural purposes. |
| What are the functions of each of the four groups of macromolecules? (Lipids) | Lipids can be used to store energy. Some lipids are important parts of biological membranes and waterproof coverings. |
| What are the functions of each of the four groups of macromolecules? (Nucleic Acids) | Nucleic acids story and transmit hereditary, or genetic, information. |
| What are the functions of each of the four groups of macromolecules? (Proteins) | Some proteins control the rate of reactions and regulate cell processes. Others form important cellular structures, while still others transport substances into or out of cells or help to fight disease. |
| What happens to chemical bonds during chemical reactions? | Chemical reactions involve changes in the chemical bonds that join atoms in compounds. |
| How do energy changes affect whether a chemical reaction will occur? | Chemical reactions that release energy often occur on their own, or spontaneously. Chemical reactions that absorb energy will not occur without a source of energy. |
| What role do enzymes play in living things and what affects their function? | Enzymes speed up chemical reactions that take place in cells. Temperature, pH, and regulatory molecules can affect the activity of enzymes. |
Created by:
Perseus99
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