In a DNA double helix each type of base forms a stable base pair with only one type of base. When bases on an RNA strand are involved in base pairing, which bases can form stable base pairs with more than one type of base?

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#Question id: 6949

#XL - T Zoology

During gastrulation in Xenopus, the future mesoderm and endoderm move inside the embryo through the "blastopore"; in contrast, in chickens, gastrulation involves cells moving inward through the:

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#Question id: 6950

#XL - T Zoology

In mammalian development, the embryo will form from which population of cells?

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#Question id: 6951

#XL - T Zoology

In chick development, the cell movement during gastrulation is called:

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#Question id: 6952

#XL - T Zoology

Which technique is commonly used for gene knock-out in mice?

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#Question id: 6953

#XL - T Zoology

Maternal factors are:

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#Question id: 6954

#XL - T Zoology

Between fertilization and the first cleavage division, actin filaments pull the cytoplasm of the frog egg toward the point of sperm entry in a process called: