Essay on BIO 141 Exam 1 Study Questions

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Gabriela Rios-Martinez March 1, 2014 BIO 141 Exam 1 Study Questions Chapter 1: Biology and the Tree of Life (#1 – 4) 1. What is the difference between a hypothesis and a scientific Theory? Between a hypothesis and a prediction? What kinds of hypotheses are useful for scientific investigations that try to explain the natural world, and which are not? Give one or more examples of hypotheses that are and are not scientifically useful. (a.) A scientific theory has two components; a pattern, and a process that creates the pattern. A hypothesis is a testable statement that explains a phenomenon of a set of observations. (b.) A prediction is different from both because it describes a result of a hypothesis that must be correct…show more content…
(b.) The first hypothesis is supported by the observation that during the dry season, when food is scarce, giraffes with longer necks can feed high in trees. (c.) The evidence that is consistent with the second hypothesis is observations of giraffes with longer necks winning in combat. (d.) Biologists agree that there is sufficient evidence to concede to the sexual selection hypothesis and that the food competition hypothesis needs further testing. (e.) Both hypothesis could be true. Chapter 6: Lipids, Membranes, and the First Cells (#5 – 13) 5. What are “lipids?” Some lipids are liquid at room temperature whereas other lipids are solid at room temperature. What accounts for this difference? Are all fats considered to be lipids? Are all lipids considered to be fats? If not, what else besides fats are considered lipids? What distinguishes “lipids” and “phospholipids?” (a.) Lipids are the foundation of membranes. They are carbon-containing compounds that are found in organisms and are largely nonpolar and hydrophobic. (b.) The fluidity of lipids depends on the length and saturation of their hydrocarbon tails. Butter is a saturated lipid with a short hydrocarbon tail, waxes are lipids with extremely long hydrocarbon tails but are still saturated, and oils are unsaturated lipids with long hydrocarbon tails. (c.) All fats are considered lipids but not all lipids are considered fats. There are three important types of lipids

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