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Biology Midterm I.docx

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BIOL 1020
Andreas Heyland

Biology Midterm I - 30 multiple choice questions - 28 questions will be ones you have seen before - Review questions: o In the lectures o In the textbook (MC at the end of the chapters covered ) o Online quizzes - 2 questions will require you to think o Will address concepts covered in the lectures and in the textbook Important information starting from lecture 1 ONE: - Seven properties of life - Core theme is evolution; explains unity and diversity of DNA - Know hierarchy of life - Know prokaryotic and eukaryotic cells - Process of science: inductive reasoning, hypothesis and theory - Question: single celled amoebas and bacteria are grouped into different domains bc bacteria cells lack a membrane enclosed nucleus TWO: - Ecology – know it - Questions: changes in seasons are caused by – the thilt of the eathrs axis towards or away from the sun - Question: Sewage causes algal blooms in lakes bc FW systems are normally limited by nutrients like nitrates and phosphates in the sewage. The addition of these nutrients causes an explosion of growth - Question: In many dense forests, plants living near the ground level, engage in intense competition for sunlight - “rain shadow” refers to the fact that most air move in off the ocean and rises bc of the mountains, it cools and drops a large amount of water so there is little rain falling further inwards from the mountains THREE: - Population ecology – how and why populations change; some change rapidly and some stay the same over a period of time - Population variables; population density and dispersion pattern (clumped/uniform/random) - Exponential growth: g =rN - Logistic growth - Questions: to figure out the human population density of your community you would need to know the number of people living there and the land area in which they live - Question: the term K-N/K is zero when the pop. Size equals carrying capacity - Question: with regards to its rate of growth a population that is growing logistically grows fastest at an intermediate population density - Answer to question: the united states has a larger footprint than its own resources can provide FOUR - Communities and ecosystems - Trophic structure – decomposers bacteria and fungi – they help return the nutrients that haven’t been used - Keystone species - Species diversity – defined by relative abundance - Species richness (woodlot B) number of different species in a lot - Questions: ecologists call the amount of mass of living organic material in an ecosystem the BIOMASS - Question: Ecologists call the amount of solar energy in a given area that is converted to chemical energy bu the ecosystems primary producer, the primary production FIVE: - Biodiversity – loss of ecosystems, species and genes - Know the threats - Invasive species – non-native species that spreads beyond its original point of introduction and causes environmental or ec
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