Biology Toughest Practice Test: Quiz!

76 Questions | Total Attempts: 349

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Biology Toughest Practice Test: Quiz!

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Questions and Answers
  • 1. 
    Why is a mushroom considered a heterotroph?
    • A. 

      (1) It manufactures its own food

    • B. 

      (2) It divides by mitosis.

    • C. 

      (3) It transforms light energy into chemical energy.

    • D. 

      (4) It obtains nutrients from its environment.

  • 2. 
    Three days after an organism eats some meat, many of the organic molecules originally contained in the meat would be found in newly formed molecules of
    • A. 

      Glucose

    • B. 

      Protein

    • C. 

      Starch

    • D. 

      Oxygen

  • 3. 
    Which body system is correctly paired with its function?
    • A. 

      Excretory—produces antibodies to fight disease-causing organisms

    • B. 

      Digestive—produces hormones for storage and insulation

    • C. 

      Circulatory—transports materials for energy release in body cells

    • D. 

      Respiratory—collects waste material for digestion

  • 4. 
    Which statement best explains why some cells in the reproductive system only respond to certain hormones?
    • A. 

      These cells have different DNA than the cells in other body systems.

    • B. 

      These cells have specific types of receptors on their membranes.

    • C. 

      Reproductive system cells could be harmed if they made contact with hormones from other body systems.

    • D. 

      Cells associated with the female reproduc- tive system only respond to the hormone testosterone.

  • 5. 
    In the cell shown below, which lettered structure is responsible for the excretion of most cellular wastes?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 6. 
    What is the main function of a vacuole in a cell?
    • A. 

      Storage

    • B. 

      Coordination

    • C. 

      Synthesis of molecules

    • D. 

      Release of energy

  • 7. 
    If 15% of a DNA sample is made up of thymine, T, what percentage of the sample is made up of cytosine, C?
    • A. 

      15%

    • B. 

      35%

    • C. 

      70%

    • D. 

      85%

  • 8. 
    Global warming has been linked to a decrease in the
    • A. 

      Size of the polar ice caps

    • B. 

      Temperature of the Earth

    • C. 

      Rate of species extinction

    • D. 

      Rate of carbon dioxide production

  • 9. 
    Several structures are labeled in the diagram of a puppy shown below. Every cell in each of these structures contains
    • A. 

      Equal amounts of ATP

    • B. 

      Identical genetic information

    • C. 

      Proteins that are all identical

    • D. 

      Organelles for the synthesis of glucose

  • 10. 
    A characteristic that an organism exhibits during its lifetime will only affect the evolution of its species if the characteristic
    • A. 

      Results from isolation of the organism from the rest of the population

    • B. 

      Is due to a genetic code that is present in the gametes of the organism

    • C. 

      Decreases the number of genes in the body cells of the organism

    • D. 

      Causes a change in the environment surrounding the organism

  • 11. 
    Agriculturists have developed some varieties of vegetables from common wild mustard plants, which reproduce sexually. Which statement best explains the development of these different varieties of vegetables?
    • A. 

      Different varieties can develop from a single species as a result of the recombination of genetic information.

    • B. 

      Different species can develop from a single species as a result of the effect of similar environmental conditions.

    • C. 

      Mutations will occur in the genes of a species only if the environment changes.

    • D. 

      Variations in a species will increase when the rate of mitosis is decreased.

  • 12. 
    The diagram below represents a technique used in some molecular biology laboratories. This technique is a type of
    • A. 

      Chromatography

    • B. 

      Gel electrophoresis

    • C. 

      Direct harvesting

    • D. 

      Genetic engineering

  • 13. 
    A species of bird known as Bird of Paradise has been observed in the jungles of New Guinea. The males shake their bodies and sometimes hang upside down to show off their bright colors and long feathers to attract females. Females usually mate with the “flashiest” males. These observations can be used to support the concept that
    • A. 

      Unusual courtship behaviors lead to extinction

    • B. 

      Someorganismsarebetteradaptedforasexual reproduction

    • C. 

      Homeostasis in an organism is influenced by physical characteristics

    • D. 

      Behaviors that lead to reproductive success have evolved

  • 14. 
    Which statement concerning the evolution of species A, B, C, D, and E is supported by the diagram below?
    • A. 

      Species B and C can be found in today’s environments.

    • B. 

      Species A and D evolved from E.

    • C. 

      Species A and C can still interbreed.

    • D. 

      SpeciesA,B,andEallevolvedfromacommon ancestor and all are successful today.

  • 15. 
    The diagram below represents a process that occurs during human reproduction. The process represented by the arrow will ensure that the
    • A. 

      Zygote contains a complete set of genetic information

    • B. 

      Gametes contain a complete set of genetic information

    • C. 

      Zygote contains half of the genetic information

    • D. 

      Gametes contain half of the genetic information

  • 16. 
    Even though identical twins have the same genetic material, they may develop slightly different characteristics because
    • A. 

      Each twin receives different chromosomes from the egg

    • B. 

      One twin may only have genes from the father

    • C. 

      Gene expression may be influenced by factors that switch genes on and off

    • D. 

      A gene mutation may have occurred before the zygote divided

  • 17. 
    What normally happens immediately after fertilization in sexual reproduction?
    • A. 

      Specialization of cells to form a fetus from an egg

    • B. 

      Production of daughter cells having twice the number of chromosomes as the parent cell

    • C. 

      Production of daughter cells having half the number of chromosomes as the parent cell

    • D. 

      Division of cells resulting in the development of an embryo from a zygote

  • 18. 
    The human female reproductive system is represented in the diagram below. Production of gametes and support of the fetus normally occur in structures
    • A. 

      1 and 2

    • B. 

      2 and 4

    • C. 

      3 and 5

    • D. 

      4 and 5

  • 19. 
    Essential materials needed for development are transported to a human fetus through the
    • A. 

      Reproductive hormones

    • B. 

      Egg cell

    • C. 

      Placenta

    • D. 

      Ovaries

  • 20. 
    The failure to regulate the pH of the blood can affect the activity of
    • A. 

      Enzymes that clot blood

    • B. 

      Red blood cells that make antibodies

    • C. 

      Chlorophyll that carries oxygen in the blood

    • D. 

      DNA that controls starch digestion in the blood

  • 21. 
    Young birds that have been raised in isolation from members of their species build nests characteristic of their species. This suggests that the nest-building behavior is
    • A. 

      Genetically inherited from parents

    • B. 

      Learned by watching members of their species

    • C. 

      A disadvantage to the survival of the species

    • D. 

      A direct result of the type of food the bird eats

  • 22. 
    Some people with spinal cord injuries do not sweat below the area of the injury. Without the ability to sweat, the human body temperature begins to rise. Which statement would best describe this situation?
    • A. 

      Feedback mechanisms regulate blood sugar levels.

    • B. 

      Gene mutations are increased.

    • C. 

      Energy from ATP is not available.

    • D. 

      Dynamic equilibrium is disrupted.

  • 23. 
    Decomposers are necessary in an ecosystem because they
    • A. 

      Produce food for plants by the process of photosynthesis

    • B. 

      Provide energy for plants by the process of decay

    • C. 

      Can rapidly reproduce and evolve

    • D. 

      Make inorganic materials available to plants

  • 24. 
    A manatee is a water-dwelling herbivore on the list of endangered species. If manatees were to become extinct, what would be the most likely result in the areas where they had lived?
    • A. 

      The biodiversity of these areas would not be affected.

    • B. 

      Certain producer organisms would become more abundant in these areas.

    • C. 

      Other manatees would move into these areas and restore the population.

    • D. 

      Predators in these areas would occupy higher levels on the energy pyramid.

  • 25. 
    A serious threat to biodiversity is
    • A. 

      Habitat destruction

    • B. 

      Maintenance of food chains

    • C. 

      Competition within a species

    • D. 

      A stable population size

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