BSC Exam 1 Questions And Correct Answers 100% Verified.

What is biology? - Correct Answers the scientific study of life Which function is NOT a property of life ? - Correct Answers Populations of organisms rarely change over time What are the two main processes upon which ecosystem depend? - Correct Answers nutrient recycling and energy flow Which substance is NOT recycled but rather is lost from ecosystems? - Correct Answers energy Which structure can perform all the activities required for life? - Correct Answers cells What name is given to the functional compartments of a cell? - Correct Answers organelles What are genes composed up? - Correct Answers DNA What is a gene? - Correct Answers a unit of inheritance Which concept was proposed by Darwin? - Correct Answers natural selection The DNA of a eukaryotic cell is found within the - Correct Answers nucleus More than half of all known species are ______. - Correct Answers insects How does taxonomy assist biologists? - Correct Answers by reducing life to its smallest common denominator, by categorizing diverse items into smaller and smaller groups, and by providing easily remembered scientific names for organisms Which kingdom of Eukarya consists primarily of unicellular organisms? - Correct Answersprotista newly discovered multicellular organisms obtain food by digesting decomposed organisms. such an organism is most likely a member of the kingdom - Correct Answersfungi Members of the kingdom Plantae differ from members of the other kingdoms of Eukarya in that most members of the kingdom Plantae ______. - Correct Answersproduce their own food The branch of biology that explains both the diversity and unity of life is - Correct Answersevolution Discovery science is primarily based on ___ ? - Correct Answersobservation A hypothesis is a - Correct Answerstentative answer to a question How do hypotheses differ from theories? - Correct AnswersTheories are more comprehensive than hypotheses. Knowing the atomic mass of an element allows inferences about which of the following - Correct Answersthe number of protons plus neutrons in the element In what way are elements in the same column of the periodic table the same? They have the same number of ____ - Correct Answerselectrons in their valence shells when neutral From its atomic number of 15, it is possible to predict that the phosphorus atom has - Correct Answers15 protons and 15 electrons Which bond or interaction would be difficult to break when compounds are put into water? - Correct Answerscovalent bonds between carbon atoms A covalent bond is likely to be polar when - Correct Answersone of the atoms sharing electrons is much more electronegative than the other atom If you change the number of neutrons in an atom, you create - Correct Answersan isotope Based on electron configuration, which of these elements would exhibit chemical behavior most like that of oxygen? - Correct Answerssulfur What is the difference between covalent and ionic bonds? - Correct Answerscovalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by - Correct Answerspolar covalent bonds Which type of bond must be broken for water to vaporize? - Correct Answershydrogen bonds Why does ice float in liquid water? - Correct Answersstable hydrogen bonds keep water molecules of ice further apart than water molecules of liquid water. Rank, from low to high, the pH of blood, stomach acid, and urine. - Correct Answersstomach acid, urine, blood The lower the pH of a solution, the __ - Correct Answersmore acidic the solution What are the four most common elements found in living organisms? - Correct Answerscarbon, oxygen, nitrogen, and hydrogen Which of the following elements is a trace element that is essential to life? - Correct Answersiron In order to have a positive charge, an atom must have ________. - Correct Answersgiven electrons All atoms of an element have the same number of ___ - Correct Answersprotons An atom's ________ are found in its nucleus. - Correct Answersneutrons and protons Beryllium's atomic mass is 9 and its atomic number is 4. How many neutrons are found in a beryllium atom? - Correct Answers9 An uncharged atom of mercury has an atomic number of 80 and an atomic mass of 200. This atom has ___ protons, ___ neutrons, and ___ electrons - Correct Answers80;120;80 The way Earth moves about the sun is most like ______. - Correct Answersan electron moving around the nucleus of an atom Isotopes of an element have the same number of ______ and different numbers of ______. - Correct Answersprotons; neutrons How do radioactive isotopes differ from isotopes? - Correct AnswersRadioactive isotopes are unstable; isotopes are stable. An atom with an electrical charge is a(n) ______. - Correct Answersion The bond between oppositely charged ions is a(n) ______ bond. - Correct Answersionic What is the outcome of evaporative cooling in the form of sweating? - Correct Answersa decrease in body temperature What name is given to substances that resist changes in pH - Correct Answersbuffers Human body cells are approximately __ water - Correct Answers70-95% The tendency of molecules of the same kind to stick together is called ______. - Correct Answerscohesion Some tiny insects are able to walk on water. Why? - Correct Answersthe surface tension that is a result of water's cohesive properties makes this possbile As water freezes - Correct Answersits molecules move