Kk555555

1. Following the directions, a student in a chemistry lab reacts zinc sulfide with hydrochloric acid in a beaker. The student then sniffs the fumes coming from the reaction and notices the odor of rotten eggs. What did this student do wrong'-The student should not have sniffed the fumes without his teacher’s permission. 2. The teacher instructs students to measure 1 gram of a powdered substance to use in a chemistry experiment, but a student takes 1.5 grams. The student reasons taking a little extra would be a good if the experiment needs to be repeated. What is wrong with this student’s decision'-The amount will not be enough if she has to run the experiment twice. 3. A student wants to do a science project on the local weather. Which of the following hypotheses is the best one to test'-Evaporation and precipitation are the main forces that drive the water cycle. 4. A student measures the length, width, and height of a box to calculate the box’s volume. In what unit should the student report the results'-Centimeters 5. A scientist breeds a strain of mice that produce too little insulin. The scientist then used these mice to research a gene therapy technique that might help people with diabetes. The mice are'-of limited value because the lifespan of mice is too short. 6. Which of the following can overturn an established scientific theory'-Prominent scientists abandon it in favor of an idea they like better. 7. Which of the following is a valid observation supported by the date'-The peak year for sunspots in the twentieth century was 1957 8. Which of the following conclusions is best supported by the data'-The number of sunspots will never rise higher than 200 in one year. 9. An advertisement for diet pills shows “before” and “after” pictures of people who took the pills and lost weight. Can you assume that you will get the same results if you buy and take the pills'-No, because the results shown in the pictures may not be true for everyone. 10. Which of the following can you learn from the nutritional label on a can of soup'-How many grams of carrots are in the soup. 11. On April 26, 1986, an accident at the Chernobyl nuclear power plant in Russia released large amounts of radioactive isotopes into the air and heavily contaminated southern Belarus. An increase in thyroid cancer in the region was reported in 1992 and confirmed in a 1998 study. This research is –required by law because the Russian government has to pay money to victims and their families. 12. A student who enjoys studying physics might best pursue a career with a(n)-Drug manufacturer. 13. A student who enjoys studying biology might best pursue a career as a(n)- agronomist 14. The scientist is studying the movement of muscles so that a better design can be made for an artificial limb. Which is the best description of the scientist’s field of study'-Physical chemist 15. The “Father of Genetics” is- Gregor Mendel 16. What is this molecule'-Lipid 17. Parts of what other organ system run through living bone'-Nervous and Endocrine 18. Which part of a cell determines which materials enter and leave the cell'-Cell Membrane 19. After an impulse in a nerve cell ends, the cell uses active transport to pump sodium ions out though the cell membrane. This mechanism maintains-Permeability 20. Which of the following could be a codon for a single amino acid'-Adenine-Thymine-guanine-cytosine 21. What is the first step in DNA replication'-the two strands of DNA pull apart 22. A mutation occurs in DNA. The sequence of bases changes from TAGGAC to TTGGAC. The starting point for transcription is unknown. By how many amino acids will the protein that forms from this code vary form the normal'-1 23. How many chromosomes will normally be found in the gametes reproductive cells of the person whose chromosomes appear in this karyotype'-81 24. Some cats have white spots. The spots are caused by a dominant gene S. cats with the genotype SS have spots over more than half of their bodies. Cats with the genotype Ss have spots on less than half of their bodies. Cats with the genotype ss have no spots. What is the phenotype of the heterozygote'-Spots over more than half of the body 25. After a nuclear division, a human cell is haploid. What process formed it'-Mitosis 26. The vascular bundles in the veins of a leaf are-Epithelia 27. A cell that is not specialized in form and function is-undifferentiated 28. Which of the following is not a level of organization in a multicellular organism'-Trophic level 29. The blood vessels that carry deoxygenated blood everywhere in the body except from lungs are' –veins 30. Which of the following statements is true based on the graph'-there is an optimum temperature at which this enzyme operates most rapidly. 31. The strongest support tissue in a plant is-ground tissue 32. Bacteria and viruses that cause disease are-autotrophs 33. Which of the following is not viral disease'-strep throat 34. Which of the following does not appear in a dichotomous key'-paired statements of characteristics 35. A tropism is-any movement of hormones though cell membranes 36. A person suffers from hay fever. When the pine pollen flies in the spring, the person sneezes and has a runny. Nose. The source of the threat his good health is-lifestyle 37. When a disease-causing microbe enters the body, the immune system triggers the production of antibodies. Antibodies are proteins that latch on to the invading microbes and mark them for destruction by other blood cells. This response-maintains equilibrium 38. Analyses of DNA sequences can reveal how closely related species are and how long ago the shared a common ancestor if-Divergent evolution has not occurred. 39. Some animal species employ elaborate courtship rituals before mating. One of the adaptive advantages of such rituals is that they ensure the union of two individuals of the same species. What process explains the origin and maintenance of such rituals'-Divergent evolution 40. What process is shown in the diagram'-Cellular respiration 41. In the six kingdom system of classification, how many kingdoms contain multicellular heterotrophs that have no cell walls'-2 42. Which of the following is true of the organism Synodontis nigriventris'-Its phylum is Syno and its class is Dontis. 43. Which of the following is not a source of carbon dioxide in the air'-Denitrification 44. The process by which nearly all living things obtain energy from food is-decomposition 45. Burdocks are weeds that grow along roadsides and in empty fields. Burdock seedpods are covered with long spines that have hooked tips. The hooked tips catch onto the hair of passing animals. When the seedpods drop off. The burdock seeds may be deposited in a place a long distance form the parent plant. What kind of relationship is this'-Mutualism 46. Plants in a biome store water in their stems. Spines instead of leaves reduce transpiration. What biome is this'-desert 47. What conclusion is supported by the data in the graph'-efforts to protect the breeding grounds of the Kirtland warbler are achieving some success. 48. What mode of fertilization is characteristic of sexual reproduction in angiosperms with large colorful flowers'-self-pollination 49. Which of the following is not true on annuals'-they are pollinated by birds and insects. 50. Look at the food chain a. Algae-daphnia-damselfly-frog i. Which organism would occupy the top in an energy pyramid'-frog 51. In what form is energy lost from an ecosystem'-heat 52. The picture shows the position of a ball every 0.25 second. Determine the velocity of the ball'-14.0 cm/s 53. What are the coefficients that will produce a balanced equation'2 3 1 1 54. The type of reaction described by the equation is-single replacement 55. During a nuclear reaction, uranium-338 decays to thorium-234. If only one other particle Is produced in the reaction what is it'-a helium nucleus 56. Which of the following statements describes what happens to the atoms of the elements from atomic number 3 to atomic number 9 as they move from left to right across the periodic table'-the atomic radius decreases and the tendency to bond increases 57. Object A has a mass of 1 kg and object B has a mass of 5 kg. The tow objects are placed into orbit around earth at the same distance. Which object will feel a greater pull of earth’s gravity'-both objects will feel the same pull of earth’s gravity. 58. Elements in which group of the periodic table tend to form compounds with chlorine with the general formula ecl^2'-17 59. A student neutralizes a strong base with an acid. Which describes what happened'-the solution become less acidic and the pH decreased. 60. What is the formula of a compound that contains only aluminum and sulfur'-AIS 61. A 15.0 kg model plane goes into a dive and levels off 24.0 m closer to the earth. How much potential energy, in joules, did the plane lose during the dive'-142.5 62. Which statement best describes how a soluble salt dissolves in water'-the salt ionizes and the ions are surrounded by the polar ends of the water molecules. 63. The specific heat of copper is about 0.38 J/g C. how much heat is needed to change the temperature of a 300-gram sample of copper from 20.0 C to 60.0 C'7.2 x 10^4 J 64. A librarian picks up a 0.95 N book from the floor and carries the book 8.0 m to the shelves and places the book on a shelf that is 2.0 m might. How much work, in joules, had been done on the book'-16 m 65. A marble drooped into a jar of honey takes longer to reach the bottom of the jar than a marble dropped into a similar jar of motor oil. The most likely explanation for this observation is that –motor oil has a higher viscosity than honey 66. A pile of bricks weights 193.76 N. the pile is lifted to a height of 10 meters in 8 seconds. How much power in watts is required'-224.2 67. A light bulb has a resistance of 160 ohms. It is plugged into a 120-V outlet. What is the current in amps flowing through the bulb'1.333333333333333333333333 68. A communication satellite is in a circular orbit around earth. If the speed of the satellite is constant, the force acting on the satellite- points in the direction that the satellite is moving 69. Blue paint appears blue because- it reflects blue light and absorbs all the other colors 70. How many elements are present in the compound acetic acid HC^2H^3O^2'-7