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PBIO Exam 1

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PBIO Exam 1 why are plants important? - ✔✔-plants produce most of the oxygen we breathe -plants produce most of the chemically stored energy we consumer as food and burn for fuel -plants are an ... excellent model organisms for basic science which of the following statements is NOT correct? - ✔✔-plants have chitin-rich cell walls viruses were first discovered - ✔✔in mosaic disease of tobacco leaves not all plants are _________; non plants, such as algae, are ______________ - ✔✔photosynthetic imagine that in hanging a sign you pound a nail into the bark of a 10-meter tall tree. if your nail were initially 0.5 (2) meter above the ground level, at approximately what height would you expect to find the nail when the tree reaches 20 meters in height? - ✔✔0.5 (2) meter above the ground which of the following is NOT correct? - ✔✔a molecule is a substance that consists of two or more atoms of the same or different elements joined by chemical bonds. for example, a water molecule (H2O) is made of two elements of hydrogen and one element of oxygen hydrogen bonding - ✔✔makes molecules cohesive living cells - ✔✔are composed mostly of water and organic compounds starch and cellulose - ✔✔both consist of chains of glucose linked together by covalent bonds; it is the nature of those bonds that distinguishes these two compounds digitalin is extracted from the seeds of the purple foxglove (Digitalis pupurea). which of the following statements is correct? - ✔✔-it is a steroid -it deters herbivores from eating the plant leaves by making herbivores ill -in the US alone, several million people rely on digitalin and related compounds from foxglove for treatment of congestive heart failure which of the following is NOT true of a starch? - ✔✔-it is synthesized from up to 1000 glucose molecules by hydration reactions to form a complex branched chain -alternating C6 molecules are on opposite sides of the polymer chain what are the 4 basic types of organic compounds in living things? - ✔✔carbohydrates, proteins, lipids, and nucleic acids in plants, disaccharides are used for short-term energy storage. the most common plant disaccharide is sucrose, or table sugar, which if obtained commercially from sugarcane and sugar beets. the diagram below shoes a synthesis of sucrose from glucose and fructose. which of the following statements is correct? - ✔✔fructose, has the same chemical formula (C6H12O6) as glucose, but the different arrangement of its atoms gives it different properties, such as a slightly sweeter taste fats and oils are made from two building block [Show More]

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