Which of the following steps is required to generate a knockout mouse?

a. microinjection of DNA into the pronucleus of a fertilized mouse egg

b. introduction of DNA into mouse embryonic stem cells

c. selection for cells containing the gene targeted insertion

d. expression of Cre protein during embryonic development

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#Question id: 31370

#Unit 5. Developmental Biology

Which would lead to a ventralized embryo in drosophila? 

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#Question id: 371

#Unit 1. Molecules and their Interaction Relevant to Biology

How many milliliters of a 2.0 M solution of boric acid must be added to 600 mL of a solution of 10 mM sodium borate in order for the pH to be 9.45? (pKa of boric acid = 9.24)

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#Question id: 1593

#Unit 4. Cell Communication and Cell Signaling

Which of the following results in long-term immunity?

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#Question id: 12154

#Unit 10. Ecological Principles

What is true of two resources that act synergistically to determine the population growth of a particular species? 

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#Question id: 5847

#Unit 8. Inheritance Biology

A Holliday structure is a(n)