A protein Geminin is binds to some type of factor in late G1 and inhibit it, which specifically involve to loading of the MCM helicase?

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#Question id: 12424

#Unit 10. Ecological Principles

The logistic model predicts a population growth curve that approximates the shape of a(n)

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#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

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#Question id: 2060

#Unit 2. Cellular Organization

An animal cell lacking carbohydrates on the external surface of its plasma membrane would likely be impaired in which function?

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#Question id: 1124

#Unit 4. Cell Communication and Cell Signaling

Which of the following is (are) intracellular second messengers?

a. Ca2+                        b. cAMP          c. epinephrine             

d. protein kinase A      e. protein kinase C

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#Question id: 28224

#Unit 5. Developmental Biology

 stem cells have the potential to differentiate into almost any cell in the embryo. They are primarily involved in growth and development, termed as