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2 Final Review for Biology 101 Professor: Scharf 1. Mutualism can be expressed by which of the following symbols. a) +/- b) +/+ c) -/- d) -/+ 2. A newly mated queen ant established a nest in an unoccupied patch of suitable habitat. Assuming that no disasters occur, what type of equation would best describe the population growth? a) Exponential b) Linear c) Logarithmic d) Logistic 3. During fertilization enzymes from the sperm s digest their way through the. a) Proboscis / lipid bilayer b) Acrosome / zona pellucida c) Chromosome / zona pellucida d) Acrosome / oocyte 4. Chimpanzees have a relatively low birth rate. They take care of their young and most live a long life. The chimp survivorship curve would look like. a) A line that slopes gradually upward 1

3 b) A horizontal line c) A relatively flat line the drops steeply at the end d) A line that slopes gradually downward 5. Within the phylum Porifera are organisms that contain an inner layer of cells called that sweep water through the. a) Amoebocytes / spongocoel b) Amoebocytes / pseudocoel c) Choanocytes / spongocoel d) Choanocytes / gastrovascular cavity 6. mice have large clutch sizes and spend very little time nurturing their offspring. These attributes suggest that mice are. a) R-selected b) K-selected c) Easily affected by the environment d) Always near carrying capacity 7. Planaria are. a) Parasitic flatworms b) Tapeworms c) Flukes within the phylum Platyhelminthes d) Free living flatworms 8. Skyrocketing growth of the human population appears to be mainly the result of. a) Migration to unsettles regions on earth 2

4 b) The concentration of humans in cities c) A drop in death rate due to better sanitation and health care d) Social changes that make it describe to have more children 9. Fundamental to community structure is (are). a) The mutualism of all organisms within the community b) To keep predation to a minimum c) The ecological footprint of each species d) Interspecies interactions of the organisms within the community 10. All of the following can be considered a niche except. a) A dead tree b) Underneath a mound of dirt c) A tree branch d) The light shinning through some leaves 11. Consumers at the highest level of a food web eventually become food for. a) Secondary consumers b) Omnivores c) Carnivores d) Decomposers and detritivores 12. Species richness and relative abundance are components of. a) Keystone species b) Species diversity c) Communities 3

5 d) Species composition 13. To ensure adequate nitrogen for a crop, a farmer would want to decrease by soil bacteria. a) Cellular respiration b) Nitrification c) Dentrification d) Nitrogen fixation 14. Which of the following best illustrates ecological succession? a) Grasses grow in a deserted field, followed by shrubs and then trees b) A mouse eats seeds, and an owl eats the mouse c) Decomposition in soil releases nitrogen that plants can use d) Overgrazing causes loss of nutrients from soil 15. The Weathering of rock is important to the. a) Nitrogen cycle b) Phosphorous cycle c) The conversion of ammonia to nitrates d) The building blocks of amino acids 16. Deforestation contributes to global warming because. a) Trees are no longer able to take up Carbon dioxide. b) The forest can no longer protect the shrubs living underneath it. c) Deciduous trees can no longer drop their leaves. d) Increasing water runoff has a detrimental effect on nutrient cycling. 17. Invasive species can grow rapidly because. 4

6 a) They form a mutualistic relationship with native species b) Because they have no natural enemies c) Insects are more likely to pollinate new plants within a community d) They are part of secondary succession. 18. Herbivores such as a rabbit, do not need nitrogen fixing bacteria to survive because. a) They do not need nitrogen to make amino acids. b) They consume the necessary nitrogen when they eat plants. c) They can convert ammonia to nitrates without bacteria. d) They do not require nitrogen in their diet to survive. 19. The open ocean and tropical rain forests contribute the most to Earth s net primary production because. a) Both have high rates of net primary production. b) Both cover huge surface areas of Earth. c) Nutrients cycle fastest in these two ecosystems. d) The ocean covers a huge surface area and the tropical rainforest has a high rate of production. 20. Carbon is taken from the atmosphere by photosynthesis, used to make organic molecules, and returned to the atmosphere by cellular respiration. a) True b) False 5

7 Answer Key: - 1) b, 2) d, 3) b, 4) b, 5) c, 6) a, 7) d, 8) c, 9) d, 10) d, 11) d, 12) b, 13) c, 14) a, 15) b 16) a, 17) b, 18) b, 19) d, 20) a. 6