BSC 1010C Exam 1 Actual Exam Questions And Correct Detailed Answers

Which of the following is a correct sequence of levels in life's hierarchy, proceeding downward from an individual animal? - Correct Answers Nervous system, brain, nervous tissue, nerve cell Competition is central to the theory of natural selection. Why does competition occur? - Correct Answers Organisms typically produce too many offspring, and resources are limited Which of the following best describes the logic of scientific inquiry? - Correct Answers If my hypothesis is correct, I can expect certain test results Darwin proposed a mechanism for descent with modification that stated that organisms of a particular species are adapted to their environment when they possess? - Correct Answers Heritable traits that enhance their survival and reproductive success in the local environment Agrobacterium infects plants and causes them to form tumors. You are asked to determine how long a plant must be exposed to these bacteria to become infected. Which of the following experiments will provide the best data to address that question? - Correct Answers Measure the number of tumors formed on plants, which are exposed to Agrobacterium for different lengths of time In the process of science, which of these is tested? - Correct AnswersHypothesis You find yourself standing next to a beautiful rose bush. Which of the following do you and the rose have in common? - Correct AnswersYou both are multicellular Which of these provides evidence of the common ancestry of all life? - Correct AnswersNear universality of the genetic code Which of the following is an example of "unity in diversity"? - Correct AnswersAll of the above are correct A localized group of organisms that belong to the same species is called a ? - Correct AnswersPopulation Agrobacterium infects plants and causes them to form tumors. You determine that tumor formation requires a large amount of the plant's energy for tissue formation. How might this change the number of offspring a plant produces, and what is the most likely explanation for this change? - Correct AnswersThe number of offspring should decrease, because the plant will divert energy, from reproduction to tumor formation How does a scientific theory differ from a scientific hypothesis? - Correct AnswersTheories are usually an explanation for a more general phenomenon; hypotheses typically address more specific issues Which of the following types of cells utilize DNA as their genetic material but do not have their DNA encased within a nuclear envelope? - Correct AnswersArchaean How does DNA encode information? - Correct AnswersIn a sequence of nucleotides Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should - Correct AnswersDetermine if hair length is heritable A friend of yours calls to say that his car would not start this morning. He asks for your help. You say that you think the battery must be dead. If so, then jump-starting the car from a good battery will solve the problem. In doing so, you are - Correct AnswersStating a hypothesis and using that hypothesis to make a testable prediction No amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rate of a specific chemical reaction. What does this illustrate? - Correct AnswersEmergent properties The phylogenetic tree below - Correct AnswersDepicts the three major domains of life Systems biology is mainly an attempt to - Correct AnswersUnderstand the behavior of entire biological systems The best experimental design - Correct AnswersIncludes a large sample size and a control, and alters only one condition between the controls and the experimental condition A controlled experiment is one that - Correct AnswersTests experimental and control groups in parallel What results from an unequal sharing of electrons between atoms? - Correct AnswersA polar covalent bond Which of the following correctly describes a reaction that has reached chemical equilibrium? - Correct AnswersThe rate of the forward reaction is equal to the rate of the reverse reaction A covalent bond is likely to be polar when - Correct AnswersOne of the atoms sharing electrons is more electronegative than the other atom What is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen? - Correct Answers2 How many electron pairs are shared between carbon atoms in a molecule that has the formula C2H4 - Correct Answers2 The reactivity of an atom arises from - Correct AnswersThe existence of unpaired electrons in the valence shell A covalent chemical bond is one in which - Correct AnswersOuter shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals How many electrons are involved in a double covalent bond? - Correct Answers4 You need to represent a molecule to bets illustrate the relative sizes of the atoms involved in their interrelationships. Which representation would work best? - Correct AnswersSpace-filling model You need to write down information about a molecule, but need to indicate only the type and number of atoms it contains. Which representation would work best? - Correct AnswersMolecular formula What causes the shape of the molecule shown above? - Correct AnswersThe shape of the sp3 hybrid orbitals of the electrons shared between the carbon and hydrogen atoms Which of the following is true for this reaction? - Correct AnswersAmmonia is being formed and decomposed simultaneously When the atoms involved in a covalent bond have the same electronegativity, what kind of bond results? - Correct AnswersA nonpolar covalent bond Nitrogen is more electronegative than hydrogen. Which of the following is a correct statement about the atoms in ammonia? - Correct AnswersEach hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge Water molecules are attracted to one another by - Correct AnswersHydrogen bonds Which of the following is a trace element required by most living organisms? - Correct AnswersMagnesium Bonds between two atoms that are equally electronegative are - Correct AnswersNonpolar covalent bonds Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants? - Correct AnswersIodine In the term trace element, the adjective trace means that - Correct AnswersThe element is required in very small amounts Why does ice float in liquid water? - Correct AnswersStable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water In living systems molecules involved in hydrogen bonding almost always contain either oxygen or nitrogen or both. How do you explain this phenomenon? - Correct AnswersOxygen and nitrogen are elements with very high attractions for their electrons Consider the following reaction at equilibrium. What would be the effect of adding additional H2CO3 - Correct AnswersIt would drive the equilibrium dynamics to the left Sodas typically contain sugar, flavoring, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be - Correct AnswersAn aqueous solution One kilocalorie equals - Correct Answers1000 calories, or the amount of heat required to raise the temperature of 1 kg of water by 1 deg C If the pH of blood increases, one would expect - Correct AnswersA decrease in the concentration of H2CO3, and an increase in the concentration of HCO3- Which of the following solutions would be expected to contain the greatest number of solute particles (molecules or ions)? - Correct Answers1 liter of 1.0 M NaCl Which of the following is a property of liquid water? Liquid water - Correct AnswersHas a heat of vaporization that is higher than that for most other substances The cities of Portland, Oregon, and Minneapolis are at about the same latitude, but Minneapolis has much hotter summers and much colder winters than Portland. Why? - Correct AnswersThe ocean near Portland moderates the temperature