Why are cells considered to be the smallest unit of life?

A. Because you need a microscope to see them
B. Because a cell is the smallest thing that carries out all the functions of life
C. Because they have an organized structure
D. Because all cells have a nucleus with DNA


Ans: B. Because a cell is the smallest thing that carries out all the functions of life

Biology & Microbiology

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Evolution in a population of island iguanas can be caused by the following agent(s):

A) Natural selection B) Genetic drift C) Gene flow D) All of the above. E) Both natural selection and genetic drift.

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True or false: In co-speciation, two groups of organisms speciate in response to each other and at the same time

A. true B. false

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Which microscope would be the BEST selection for examination of a virus?

A. Confocal scanning laser microscope B. Atomic force microscope C. Dark-field light microscope D. Scanning electron microscope

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Mammalian skin has both sebaceous and sudoriferous glands; theses glands respectively secrete what substances?

a. sebum, milk b. sebum, sweat c. sweat, sebum d. milk, sebum

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