Exam 1: What Is Life

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There is a standing debate among biologists involved in looking for life on other planets as to how any alien organisms should be handled. Some feel that alien organisms should not be introduced on Earth; others feel that investigating these alien organisms will provide important information. What are some of the arguments on both sides?

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The best responses will include discussion of the following ideas:How to grow alien organisms; how to control their growth; problems that could arise from our lack of understanding of the alien organisms; studying alien organisms may allow us to better understand life on Earth; study may provide new answers to basic questions about Earth; study may provide new materials to aid mankind. Thoughtful answers will discuss the ramifications this information will have on society.

Which of the following concepts best describes the wide variety of dog species we observe, ranging from the domesticated golden retriever or the basset hound, to the wild dogs of Africa, to foxes?

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A

What is the term that describes the study of the relationship between living things and components of their environment?

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Describe natural selection. Who first coined this phrase?

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If you were studying a soil sample from another planet and you discovered some interesting specimens that seemed to be alive, what procedure could you use to verify that they were indeed alive?

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Match the following organisms with the domain in which they are classified.
fungi
Eukarya
plants
Fungi
animals
Archaea
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fungi
Eukarya
plants
Fungi
animals
Archaea
protists
Bacteria
single-celled organisms that typically live in extreme, hostile environments
cells that are produced in the bone marrow, are never changed by the thymus, and manufacture antibodies
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To maintain order within their cells and organs, all living things must

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The first step in the scientific method is to

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The scientific name for the black-footed ferret is Mustela nigripes. The name Mustela indicates the ____________ to which this organism belongs.

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Match the following examples with the correct descriptive term. 4.The portion of the earth where life exists 5.Group of organisms of the same species 6. All living organisms in an area 7. All living organisms and the nonliving physical environment 8. Living biological entity A. organisms B. community C. eoosystem D. biosystem E. population F. biosphere

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One of the major characteristics of life is reproduction. There are two types of reproduction: asexual and sexual reproduction. Compare the advantages and disadvantages of both types of reproduction. What do you think is the benefit of sexual reproduction that makes it so much more prevalent among living things?

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Many studies of potentially useful new drugs involve the use of two groups of people: One group takes the drug and another group takes a placebo (like a sugar pill). Members of both groups do not know whether they are taking the drug or the placebo. What is the reason for designing these experiments this way?

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Some bacteria are able to thrive in very warm environments such as the hot springs in Yellowstone National Park. Explain how natural selection may have allowed these organisms to inhabit this harsh environment.

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All living things have the following characteristics except

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In populations, adaptation usually arises through

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If you were studying the ecology of a marsh community, what components would you need to consider?

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Match the following domains with the appropriate characteristic.
Domain Bacteria
often live in extreme environments
Domain Archaea
includes only plants and animals
Domain Eukarya
complex cells with a nucleus
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Domain Bacteria
often live in extreme environments
Domain Archaea
includes only plants and animals
Domain Eukarya
complex cells with a nucleus
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Young multicelled organisms usually start out small, then grow in size and increase in complexity. This process is called

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List the 9 characteristics that living things share.

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Scientists have found that ancient fossils

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