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Walden PUBH6170 quiz 1

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Question;Question 1Lipids are important to biological systems becauseAnswerthey are solid at body temperature so they stabilize membranessome lipid types are potentially large sources of energy to perform cellular work.most help to buffer aqueous solutions in the body.all lipids are very soluble in water.1 points Question 2Sucrose is an oligosaccharide made up of which of the following sugars?Answerglucose and glucosedeoxyribose and ribosestarch and glycogenmaltose and glucoseglucose and fructose1 points Question 3Which of the following is not a property of water?Answeris composed of polar moleculesis a liquid at room temperatureholds heat energyis a biological solvent for polar moleculesconsists of molecules attracted to each other by covalent bonds1 points Question 4"Blind" experiments are designed to reduce the possibility that the outcome of an experiment might be affected by the power of suggestion.AnswerTrueFalse1 points Question 5The validity of a prediction in the scientific method is determined by experimentation or observation.AnswerTrueFalse1 points Question 6In science, graphs are often used to display data collected from an experiment. Which of the following is true regarding a graph?AnswerMost graphs are plotted on three axes.The dependent variable is plotted on the x-axis.Independent variables may include age or time.The horizontal axis is known as the ordinate.Graphs always involve plots of individual data points.1 points Question 7DNA differs from RNA in that DNA:Answeris single stranded.contains deoxyribose.is made up of nucleotides.contains cytosine.contains phosphates.1 points Question 8Pancreatic cells make insulin, which is a type of protein. These cells use ________ in order to synthesize insulin by the process of ________.Answeroligosaccharides, hydrolysis.nucleotides, condensation.amino acids, dehydration synthesis.fatty acids and glycerol, hydrolysis.monosaccharides, dehydration synthesis.1 points Question 9Which of the following is true regarding electrons, shells, and energy?AnswerElectrons are located in shells around the nucleus.Electrons are attracted to each other because they have the same charge.In order for an electron to move closer to the nucleus, it must absorb energy.The innermost electron shell has the most potential energy.As an electron moves to a shell further from the nucleus, it loses energy.1 points Question 10Because carbon requires four additional electrons to fill its outermost shell, it has a natural tendency to form four covalent bonds with other atoms, making it an ideal element for forming structures in living cells.AnswerTrueFalse1 points Question 11Which of the following is not a molecule?AnswerCO2H2ONaClCH21 points Question 12Each amino acid is composed of a central carbon that forms covalent bonds with four other atoms/molecules. These atoms/molecules include all but a(n):AnswerR group.A group.amino group.hydrogen atom.carboxyl group.1 points Question 13A molecule of water forms when one oxygen binds with two hydrogen atoms, completely filling the outershell of the hydrogens and oxygen. The type of bond linking the atoms together isAnswerpolarcovalenthydrogenionicdisulfide1 points Question 14Peer review is essential to the scientific process becauseAnswerIt ensures that the findings from experimentation are scrutinized for accuracyit is the primary means for informing other scientists of new information in the fieldthe process can lead to improvements in articles prior to being publishedthe process immediately validates any hypothesis tested in the experimentsboth A and C1 points Question 15The more buffers present in a body fluid, the less stable the pH will be.AnswerTrueFalse

 

Paper#62977 | Written in 18-Jul-2015

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