The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?

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#Question id: 2954

#Unit 2. Cellular Organization

Cyclin concentrations are highest during which periods of the cell cycle?

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#Question id: 2955

#Unit 2. Cellular Organization

Cyclin is to MPF as ............ is to cyclin-dependent kinases.

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#Question id: 2956

#Unit 2. Cellular Organization

The product of the cdc2 gene is

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#Question id: 2958

#Unit 2. Cellular Organization

Which of the following structures is not a feature of the mitotic chromosome?

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#Question id: 2960

#Unit 2. Cellular Organization

Which type of spindle microtubules are attached to chromosomes?

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#Question id: 2963

#Unit 2. Cellular Organization

Eukaryotic chromosomes are composed of which of the following macromolecules?