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Calabunga

1. What are goals of science? Choose all that apply. (3 points) Partially correct answer (1 pt) to investigate the natural world Unselected answer (0 pts) to establish unchanging facts Partially correct answer (1 pt) to explain natural phenomena Partially correct answer (1 pt) to make useful predictions based on evidence 3 /3 points 2. During a controlled experiment, a scientist isolates and tests (1 point) Unselected answer (0 pts) a conclusion. Unselected answer (0 pts) a mass of information. Unselected answer (0 pts) a control

  • one year ago
  • one year ago

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  1. Calabunga
    Best Response
    You've already chosen the best response.
    Medals 5

    1. What are goals of science? Choose all that apply. (3 points) Partially correct answer (1 pt) to investigate the natural world Unselected answer (0 pts) to establish unchanging facts Partially correct answer (1 pt) to explain natural phenomena Partially correct answer (1 pt) to make useful predictions based on evidence 3 /3 points 2. During a controlled experiment, a scientist isolates and tests (1 point) Unselected answer (0 pts) a conclusion. Unselected answer (0 pts) a mass of information. Unselected answer (0 pts) a control group. Correct answer (1 pt) a single variable. 1 /1 point 3. How are proteins, lipids, and polysaccharides similar? (1 point) Unselected answer (0 pts) They contain the same atoms and types of bonds between atoms. Correct answer (1 pt) They are natural polymers composed of repeating monomeric units. Unselected answer (0 pts) They are formed during exergonic metabolic reactions in a cell. Unselected answer (0 pts) They have characteristics similar to the elements making them up. 1 /1 point 4. Which of the following statements about enzymes is not true? (1 point) Unselected answer (0 pts) Enzymes work best at a specified pH. Correct answer (1 pt) All enzymes have the same shape as their substrates. Unselected answer (0 pts) Enzymes are proteins. Unselected answer (0 pts) The shape of an enzyme allows it to do its job. 1 /1 point 5. Which of the following shows the correct sequence of levels from least complex to most complex? (1 point) Unselected answer (0 pts) biosphere, biome, ecosystem, community, population, organism Unselected answer (0 pts) population, organism, ecosystem, community, biome, biosphere Unselected answer (0 pts) community, population, organism, biome, biosphere, ecosystem Correct answer (1 pt) organism, population, community, ecosystem, biome, biosphere 1 /1 point 6. Why is an organism’s niche like a person’s occupation? (1 point) Unselected answer (0 pts) An organism makes “money” by working in its niche. Unselected answer (0 pts) A niche is a “company” that the organism has to work in. Unselected answer (0 pts) A niche is a “factory” where organisms build things. Correct answer (1 pt) An organism can “make a living” and survive in its niche. 1 /1 point 7. Which of the following occurs during the ecological succession of an ecosystem? (1 point) Unselected answer (0 pts) An ecosystem reaches a final, unchanging stage. Unselected answer (0 pts) Animals move out of the ecosystem until succession is complete. Correct answer (1 pt) Living organisms modify their environment a little at a time. Unselected answer (0 pts) Parts of communities split off to form new communities. 1 /1 point 8. Suppose that a species of toads is introduced into a new environment in an attempt to reduce the population of insects. The toad has no natural predators in the new environment. The toad population would most likely (1 point) Correct answer (1 pt) increase exponentially. Unselected answer (0 pts) increase logistically. Unselected answer (0 pts) decrease rapidly and die out. Unselected answer (0 pts) remain the same. 1 /1 point 9. A major factor that negatively affects biodiversity is (1 point) Unselected answer (0 pts) biological magnification. Correct answer (1 pt) habitat fragmentation. Unselected answer (0 pts) contour plowing. Unselected answer (0 pts) nonrenewable resources. 1 /1 point 10. Which of the following is not a principle of the cell theory? (1 point) Unselected answer (0 pts) Cells are the basic units of life. Unselected answer (0 pts) All living things are made of cells. Correct answer (1 pt) Very few cells are able to reproduce. Unselected answer (0 pts) All cells are produced from existing cells. 1 /1 point 11. Looking at a cell under a microscope, you note that it is a prokaryote. How do you know? (1 point) Unselected answer (0 pts) The cell lacks cytoplasm. Unselected answer (0 pts) The cell lacks a cell membrane. Correct answer (1 pt) The cell lacks a nucleus. Unselected answer (0 pts) The cell lacks genetic material. 1 /1 point 12. Which of the following organisms is a heterotroph? (1 point) Correct answer (1 pt) mushroom Unselected answer (0 pts) alga Unselected answer (0 pts) wheat Unselected answer (0 pts) sunflower 1 /1 point 13. The energy of the electrons passing along the electron transport chain is directly used to (1 point) Unselected answer (0 pts) make lactic acid. Unselected answer (0 pts) make citric acid. Correct answer (1 pt) transport H+ ions. Unselected answer (0 pts) split water molecules. 1 /1 point 14. Which of the following is a correct statement about the events of the cell cycle? (1 point) Unselected answer (0 pts) Little happens during the G1 and G2 phases. Unselected answer (0 pts) DNA replicates during cytokinesis. Unselected answer (0 pts) The M phase is usually the longest phase. Correct answer (1 pt) Interphase consists of the G1, S, and G2 phases. 1 /1 point 15. Use Figure 11–3 to answer the following question. If a pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy), how many different phenotypes are their offspring expected to show? Figure 11-3 pea plants phenotypes (1 point) Correct answer (1 pt) 2 Unselected answer (0 pts) 4 Unselected answer (0 pts) 8 Unselected answer (0 pts) 16 1 /1 point 16. Which of the following is a correct statement? (1 point) Correct answer (1 pt) Gametes are formed by meiosis and are haploid, while body cells are formed by mitosis and are diploid. Unselected answer (0 pts) Gametes are formed by mitosis and are haploid, while body cells are formed by meiosis and are diploid. Unselected answer (0 pts) Gametes are formed by meiosis and are diploid, while body cells are formed by mitosis and are haploid. Unselected answer (0 pts) Gametes are formed by mitosis and are diploid, while body cells are formed by meiosis and are haploid. 1 /1 point 17. Griffith’s experiments advanced the study of genetics by proving that (1 point) Correct answer (1 pt) there is a chemical that contains genetic information that can be passed from one organism to another. Unselected answer (0 pts) bacteria can make people sick by infecting them with a chemical that contains genetic information. Unselected answer (0 pts) the bacteria that can make mice sick are the same bacteria that can be grown in culture dishes in a laboratory. Unselected answer (0 pts) genetic information can be passed from parents to their offspring during sexual reproduction. 1 /1 point 18. According to Figure 13–3, which code specifies the same amino acid as UAU? Figure 13-3 Codons Found in Messanger RNA (1 point) Correct answer (1 pt) UAC Unselected answer (0 pts) UAA Unselected answer (0 pts) UGC Unselected answer (0 pts) UGU 1 /1 point 19. If nondisjunction occurs during meiosis, (1 point) Unselected answer (0 pts) only two gametes may form instead of four. Correct answer (1 pt) some gametes may have an extra copy of some genes. Unselected answer (0 pts) the gamete cannot join another to form an organism. Unselected answer (0 pts) the gametes redistribute chromosomes after meiosis. 1 /1 point 20. To produce transgenic bacteria that make insulin, which of the steps listed below would a scientist do first? (1 point) Unselected answer (0 pts) Insert the human insulin gene into a plasmid. Unselected answer (0 pts) Extract the insulin from the bacterial culture. Correct answer (1 pt) Cut out the insulin gene from human DNA. Unselected answer (0 pts) Transform bacteria with the recombinant plasmid. 1 /1 point 21. A scientist discovers an important breakthrough in cancer treatment. The scientist thinks the information could save thousands of lives and immediately announces the results on national television, skipping peer review. How might other scientists react to this news? (1 point) Correct answer (1 pt) They will be skeptical because the report was not peer-reviewed. Unselected answer (0 pts) They will quickly start to use the new treatment on their patients. Unselected answer (0 pts) They will congratulate the scientist for the discovery. Unselected answer (0 pts) They will denounce the work and call the scientist a fraud. 1 /1 point 22. A chlorine atom that has 17 protons and 18 neutrons is called (1 point) Unselected answer (0 pts) chlorine-17. Unselected answer (0 pts) chlorine-18. Correct answer (1 pt) chlorine-35. Unselected answer (0 pts) chlorine-1. 1 /1 point 23. If you stir salt into boiling water, you produce a (1 point) Unselected answer (0 pts) mixture called a suspension. Correct answer (1 pt) mixture called a solution. Unselected answer (0 pts) solution and suspension. Unselected answer (0 pts) mixture only. 1 /1 point 24. In chemical reactions, atoms are (1 point) Unselected answer (0 pts) created. Unselected answer (0 pts) destroyed. Correct answer (1 pt) rearranged. Unselected answer (0 pts) neutralized. 1 /1 point 25. In which way are plants in a sunny mountain meadow and sulfur bacteria in a deep-sea volcanic vent alike? (1 point) Unselected answer (0 pts) They both use photosynthesis to make their own food. Correct answer (1 pt) They both produce carbohydrates and oxygen. Unselected answer (0 pts) They both use chemosynthesis to produce their own food. Unselected answer (0 pts) They both produce carbon and hydrogen. 1 /1 point 26. Protecting an entire ecosystem ensures that (1 point) Unselected answer (0 pts) captive breeding programs will succeed. Unselected answer (0 pts) existing parks and reserves will expand. Unselected answer (0 pts) governments will set aside land. Correct answer (1 pt) interactions among many species will be preserved. 1 /1 point 27. Which part of the water cycle is a biological process? (1 point) Unselected answer (1 pt) transpiration Unselected answer (0 pts) runoff Incorrect Answer (0 pts) precipitation Unselected answer (0 pts) condensation 0 /1 point 28. Which of the following occurs during the ecological succession of an ecosystem? (1 point) Unselected answer (0 pts) An ecosystem reaches a final, unchanging stage. Unselected answer (0 pts) Animals move out of the ecosystem until succession is complete. Correct answer (1 pt) Living organisms modify their environment a little at a time. Unselected answer (0 pts) Parts of communities split off to form new communities. 1 /1 point 29. If immigration and emigration numbers remain equal, which of these could cause a slowed growth rate? (1 point) Unselected answer (0 pts) increased birthrate. Unselected answer (0 pts) constant death rate Correct answer (1 pt) decreased birthrate Unselected answer (0 pts) constant birthrate 1 /1 point 30. Which statement mainly explains why even well-conditioned athletes have to pace themselves for athletic events that last several hours? (1 point) Unselected answer (0 pts) Lactic acid fermentation can cause muscle soreness. Unselected answer (0 pts) Heavy breathing is needed to get rid of lactic acid. Correct answer (1 pt) Cellular respiration releases energy more slowly than fermentation does. Unselected answer (0 pts) Alcoholic fermentation produces carbon dioxide.

    • one year ago
  2. lolly
    Best Response
    You've already chosen the best response.
    Medals 1

    1. What are goals of science? Choose all that apply. (3 points) (1 pt) to investigate the natural world (0 pts) to establish unchanging facts (1 pt) to explain natural phenomena (1 pt) to make useful predictions based on evidence 3 /3 points 2. During a controlled experiment, a scientist isolates and tests (1 point) (0 pts) a conclusion. (0 pts) a mass of information. (0 pts) a control group. (1 pt) a single variable. 1 /1 point 3. How are proteins, lipids, and polysaccharides similar? (1 point) (0 pts) They contain the same atoms and types of bonds between atoms. (1 pt) They are natural polymers composed of repeating monomeric units. (0 pts) They are formed during exergonic metabolic reactions in a cell. (0 pts) They have characteristics similar to the elements making them up. 1 /1 point 4. Which of the following statements about enzymes is not true? (1 point) (0 pts) Enzymes work best at a specified pH. (1 pt) All enzymes have the same shape as their substrates. (0 pts) Enzymes are proteins. (0 pts) The shape of an enzyme allows it to do its job. 1 /1 point 5. Which of the following shows the correct sequence of levels from least complex to most complex? (1 point) (0 pts) biosphere, biome, ecosystem, community, population, organism (0 pts) population, organism, ecosystem, community, biome, biosphere (0 pts) community, population, organism, biome, biosphere, ecosystem (1 pt) organism, population, community, ecosystem, biome, biosphere 1 /1 point 6. Why is an organism’s niche like a person’s occupation? (1 point) (0 pts) An organism makes “money” by working in its niche. (0 pts) A niche is a “company” that the organism has to work in. (0 pts) A niche is a “factory” where organisms build things. (1 pt) An organism can “make a living” and survive in its niche. 1 /1 point 7. Which of the following occurs during the ecological succession of an ecosystem? (1 point) (0 pts) An ecosystem reaches a final, unchanging stage. (0 pts) Animals move out of the ecosystem until succession is complete. (1 pt) Living organisms modify their environment a little at a time. (0 pts) Parts of communities split off to form new communities. 1 /1 point 8. Suppose that a species of toads is introduced into a new environment in an attempt to reduce the population of insects. The toad has no natural predators in the new environment. The toad population would most likely (1 point) (1 pt) increase exponentially. (0 pts) increase logistically. (0 pts) decrease rapidly and die out. (0 pts) remain the same. 1 /1 point 9. A major factor that negatively affects biodiversity is (1 point) (0 pts) biological magnification. (1 pt) habitat fragmentation. (0 pts) contour plowing. (0 pts) nonrenewable resources. 1 /1 point 10. Which of the following is not a principle of the cell theory? (1 point) (0 pts) Cells are the basic units of life. (0 pts) All living things are made of cells. (1 pt) Very few cells are able to reproduce. (0 pts) All cells are produced from existing cells. 1 /1 point 11. Looking at a cell under a microscope, you note that it is a prokaryote. How do you know? (1 point) (0 pts) The cell lacks cytoplasm. (0 pts) The cell lacks a cell membrane. (1 pt) The cell lacks a nucleus. (0 pts) The cell lacks genetic material. 1 /1 point 12. Which of the following organisms is a heterotroph? (1 point) (1 pt) mushroom (0 pts) alga (0 pts) wheat (0 pts) sunflower 1 /1 point 13. The energy of the electrons passing along the electron transport chain is directly used to (1 point) (0 pts) make lactic acid. (0 pts) make citric acid. (1 pt) transport H+ ions. (0 pts) split water molecules. 1 /1 point 14. Which of the following is a correct statement about the events of the cell cycle? (1 point) (0 pts) Little happens during the G1 and G2 phases. (0 pts) DNA replicates during cytokinesis. (0 pts) The M phase is usually the longest phase. (1 pt) Interphase consists of the G1, S, and G2 phases. 1 /1 point 15. Use Figure 11–3 to answer the following question. If a pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy), how many different phenotypes are their offspring expected to show? (1 point) (1 pt) 2 (0 pts) 4 (0 pts) 8 (0 pts) 16 1 /1 point 16. Which of the following is a correct statement? (1 point) (1 pt) Gametes are formed by meiosis and are haploid, while body cells are formed by mitosis and are diploid. (0 pts) Gametes are formed by mitosis and are haploid, while body cells are formed by meiosis and are diploid. (0 pts) Gametes are formed by meiosis and are diploid, while body cells are formed by mitosis and are haploid. (0 pts) Gametes are formed by mitosis and are diploid, while body cells are formed by meiosis and are haploid. 0 /1 point 17. Griffith’s experiments advanced the study of genetics by proving that (1 point) (1 pt) there is a chemical that contains genetic information that can be passed from one organism to another. (0 pts) bacteria can make people sick by infecting them with a chemical that contains genetic information. (0 pts) the bacteria that can make mice sick are the same bacteria that can be grown in culture dishes in a laboratory. (0 pts) genetic information can be passed from parents to their offspring during sexual reproduction. 1 /1 point 18. According to Figure 13–3, which code specifies the same amino acid as UAU? (1 point) (1 pt) UAC (0 pts) UAA (0 pts) UGC (0 pts) UGU 1 /1 point 19. If nondisjunction occurs during meiosis, (1 point) (0 pts) only two gametes may form instead of four. (1 pt) some gametes may have an extra copy of some genes. (0 pts) the gamete cannot join another to form an organism. (0 pts) the gametes redistribute chromosomes after meiosis. 1 /1 point 20. To produce transgenic bacteria that make insulin, which of the steps listed below would a scientist do FIRST? (1 point) (0 pts) Insert the human insulin gene into a plasmid. (0 pts) Extract the insulin from the bacterial culture. (1 pt) Cut out the insulin gene from human DNA. (0 pts) Transform bacteria with the recombinant plasmid. 1 /1 point

    • one year ago
  3. Calabunga
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    Medals 5

    Why are you posting answers that I've already posted, on the same board?

    • one year ago
  4. Christinababy69
    Best Response
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    Medals 0

    This is a different test

    • one year ago
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