Some members of a photosynthetic plant species are genetically resistant to an herbicide, while other members of the same species are not resistant to the herbicide. Which combination of events should cause the most effective replacement of the non-herbicide-resistant strain of plants by the resistant strain?

1. The presence of the herbicide in the environment

2. The absence of the herbicide from the environment

3. The maintenance of the proper conditions for one generation

4. The maintenance of the proper conditions for many generations

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#Question id: 11535

#Unit 6. System Physiology – Plant

During IPA pathway in the biosynthesis of auxin using  following enzymes except_____

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#Question id: 1090

#Unit 4. Cell Communication and Cell Signaling

Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?

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#Question id: 31246

#Unit 5. Developmental Biology

In inducing limb growth Fgf8-secreting beads can substitute for the: 

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#Question id: 2211

#Unit 2. Cellular Organization

Which of these statements about facilitated diffusion across a membrane is true?

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#Question id: 23102

#Unit 2. Cellular Organization

How many times DNA is folded/compacted when a 200bp DNA is wrapped over core histone