Alters Quiz #1 - Chapters 1, 2, 5, 9

Question 1 of 20 Algae, paramecia and amoebae belong to what kingdom? A. Plant B. Fungi C. Protista D. Animal Question 2 of 20 A forest may contain populations of bacteria, fungi, deer, frogs and salamanders. These all combine to form a(n): A. community B. species C. ecosystem D. biosphere Question 3 of 20 In 1859 Charles Darwin published his book, On the Origin of Species, where he described the: A. cell theory B. theory of evolution C. principles of heredity D. gene theory Question 4 of 20 Simple microorganisms that live in hot springs and acid lakes belong to the: A. Fungi B. Bacteria C. Protista D. Archaea Question 5 of 20 The microscopist Rudolf Virchow believed that: A. life arises from nonliving material B. cells can arise only from preexisting cells C. genes are the units of heredity D. the cell is the unit of life

Question 6 of 20 Which is not a key feature of the scientific method? A. observation B. statistic analysis C. hypothesis formation D. hypothesis testing Question 7 of 20 The hypothesis in a seed germination experiment is: Light is necessary for lettuce seed germination . Groups of lettuce seeds are placed in light with warm temperatures and adequate moisture. Another set of identical seeds is placed in the dark under the same conditions.What is the dependent variable? A. warm temperatures B. presence of darkness C. presence of light D. germination rate Question 8 of 20 In the Brand X fertilizer experiment, the fertilizer is the: A. controlled variable B. dependent variable C. treatment D. control Question 9 of 20 The hypothesis in a seed germination experiment is: Light is necessary for lettuce seed germination . Groups of lettuce seeds are placed in light with warm temperatures and adequate moisture. Another set of identical seeds is placed in the dark under the same conditions. In this experiment, what is the independent variable? A. presence of light B. germination rate C. presence of darkness D. warm temperatures Question 10 of 20 Which scientist published a book in the 1500s giving evidence the Earth orbits the sun? A. Lyell B. Darwin C. Galileo D. Copernicus

Question 11 of 20 In order to visualize a specimen, an electron microscope uses _____ rather than light. A. x-rays B. a beam of protons C. a thin layer of metal D. a beam of electrons Question 12 of 20 The model of the cell membrane that is widely accepted today is the: A. cytoskeleton model B. endosymbionic theory C. fluid mosaic model D. cell theory Question 13 of 20 Pressure that builds up in plant cells and gives rigidity to them is called: A. turgidity B. equilibrium C. a concentration gradient D. plasmolysis Question 14 of 20 Transport proteins that facilitate the movement of water molecules across the cell membrane are: A. enzymes B. aquaporins C. carrier proteins D. receptor proteins Question 15 of 20 Prokaryotic cells arose on Earth more than: A. 4.5 billion years ago B. 1 million years ago C. 3 billion years ago D. 3 million years ago

Question 16 of 20 The organism, Neurospora, is a(n): A. plant B. mold C. protist D. alga Question 17 of 20 Which do scientists hypothesize is a function of DNA repeats? A. All of the above B. protection of other DNA sequences C. involved in gamete production D. structural or organizational role in chromosomes Question 18 of 20 Extra sequences of nucleotides that intervene between the polypeptide-specifying portions of a gene are called: A. exons B. telomeres C. promoters D. introns Question 19 of 20 A complex of DNA and histone is called a(n): A. nucleus B. nucleolus C. nuclein D. nucleosome Question 20 of 20 The discovery that bacteria can transfer genetic material to other bacteria in transformation was made by: A. Chargaff B. Avery C. Levene D. Griffin

Reactions

Question 1 of 10 What is the correct value for Avogadro's number? A. 6.022 × 102.3 B. 6.022 × 1033 C. 6.023 × 1022 D. 6.022 × 1023 E. none of the above

Question 2 of 10 What is the mass of 1.56 × 1021 atoms of magnesium in grams? A. 4.72 × 10-5 B. 0.0630 C. 1.07 × 10-4 D. 0.142 E. none of the above

Question 3 of 10 Calculate the molar mass of ammonium carbonate. A. 88.05 g/mol B. 96.09 g/mol C. 78.05 g/mol D. 112.09 g/mol E. none of the above

Question 4 of 10 What are the coefficients for the following reaction when it is properly balanced?___HCl + ___Mg → ___MgCl2 + ___ H2 A. 2, 1, 2, 2 B. 2, 1, 1, 1 C. 1, 2, 1/2, 1 D. 1, 1, 1, 2 E. none of the above

Question 5 of 10 What type of reaction is the generic equation A + BC → AC + B? A. synthesis/combination B. double-displacement C. decomposition D. single displacement E. none of the above

Question 6 of 10 A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of A. iron(III) chloride. B. magnesium chloride. C. barium chloride. D. potassium chloride. E. none of the above

Question 7 of 10 How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A. 3.6 B. 7.2 C. 1.8 D. 0.9 E. not enough information

Question 8 of 10 What is the limiting reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A. Al B. Al2O3 C. O2 D. both Al and O2 E. not enough information

Question 9 of 10 The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield? A. 75.0 B. 178 C. 56.0 D. 31.5 E. none of the above

Question 10 of 10 A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available, what is the minimum amount, in grams, of H2needed to completely react with this quantity of N2? A. 3.03 g B. 1.01 g C. 1.51 g D. 6.06 g E. none of the above