The primitive streak in a bird is the functional equivalent of :

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#Question id: 15974

#Unit 12. Applied Biology

Growth regulator is not required for___

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#Question id: 11351

#Unit 10. Ecological Principles

Which type of mutualism is demonstrated by plant-pollinator relationships?

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#Question id: 2982

#Unit 2. Cellular Organization

Match the following proteins (Column I) with their functions (Column II) during cell cycle.

Column I	Column II
A. Cdc25C phosphatase	i. Activates vertebrate S phase CDKs
B. INK4	ii. Activation of Mitotic CDKs
C. Cdc25A phosphatase	iii. Binds and inhibits G1 CDKs
D. APC/CCdc20	iv. Degradation of securin

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#Question id: 12787

#Unit 10. Ecological Principles

A cow's herbivorous diet indicates that it is a(n)

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#Question id: 15637

#Unit 13. Methods in Biology

You have isolated two mutations in the Lac operon that cause constitutive expression of Lac genes. You designate these mutants Lac1– and Lac2–. Making use of an F' that carries the Lac operon with the LacY gene mutated, you construct strains that you test for both ß-galactosidase activity and Lac permease activity with results shown below.

     

Classify each mutation as dominant or recessive and as cis- or trans-acting, giving the experimental result that allows you to arrive at each conclusion. Finally, deduce what type of Lac mutation best fits the properties of Lac 1– and of Lac 2–.