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Life Science Exam 1
Content Based on Review Questions (Chapter 2)
| Term | Definition |
|---|---|
| Which feature is present in all known living things? | Metabolic reactions |
| Which term best describes the water combined with powder to make lemonade? | Solvent (what dissolves the solute) |
| Which term best describes the powder combined with water to make lemonade? | Solute (what is being dissolved) |
| Which chemical condition describes the electrons in a water molecule being shared unequally between the hydrogen and oxygen atoms? | Polar |
| Which particles are found in the nucleus of an atom? | Neutrons and protons |
| Which characteristic would zombies need to develop to be considered alive? | Ability to perform homeostasis and heal wounds |
| What type of chemical bond connects the complementary strands of a DNA molecule to each other? | Hydrogen bonds |
| Which element is the basis for the macromolecules found in living things? | Carbon |
| Imagine a newly discovered biological molecule that is mostly hydrophobic in its structure. How would this new molecule be classified? | Lipid |
| What atoms may form a hydrogen bond? | One hydrogen atom and one partially negative atom |
| What kind of bond is found between the individual atoms of a single water molecule? | Covalent bonds that are polar |
| What kind of bond holds two water molecules to each other? | Hydrogen bonds |
| Which component of amino acids accounts for the differences in their properties? | The side group |
| What molecule is composed only of chains and rings of hydrogen and carbon? | Hydrocarbon |
| What molecule is composed of one or more sugars? | Carbohydrate |
| Which monomer units combine to form polysaccharides? | Sugars |
| Which monomer units combine to form proteins? | Amino acids |
| Which monomer units combine to form nucleic acids? | Nucleotides |
| Which macromolecule is a lipid? | Cholesterol |
| What is the ability of living things to maintain a relatively constant internal environment? | Homeostasis |
| Sodium chloride is composed of molecules that are stable when dry. In water, the atoms of the molecules separate from each other. What type of chemical bond holds the dry substance together? | Ionic bonds |
| Which type of macromolecule is present in enzymes? | Proteins |
| Which activity is part of a living organism's metabolism? | Secretion of wastes |
| Which example is an element? | Calcium |
| What type of electric charge do protons carry? | Positive |
| Which example is nonpolar? | A molecule with no partial charges |
| Use the figure to answer the following question. If two or more of these molecules are close to each other, how will they bond together? | Hydrogen bonding, with a hydrogen atom bonded to an oxygen atom |
| What kind of molecule forms the bilayer found in cellular membranes? | Phospholipid |
| Which feature is found in both prokaryotic and eukaryotic cells? | DNA |
| Which feature is found in prokaryotic cells? | Cell wall |
| How does the diameter of a prokaryotic cell compare with the diameter of a eukaryotic cell? | A prokaryote has one-tenth the diameter of a eukaryote |
| What does "hydrophobic" mean? | Repelled by water |
| Which type of lipid includes sex hormones such as testosterone and estrogen? | Steroids |
| How many bonds can carbon form with other elements? | 4 |
| Why is carbon often involved in chemical bonding? | It can form bonds with four other elements. |
Created by:
FaithMcBaith
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