Which of the following conditions at the A-V node will cause a decrease in heart rate?

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#Question id: 15422

#Unit 5. Developmental Biology

During Vulval induction in C. elegans, the anchor cell secretes, a paracrine factor which receives by VPCs and become vulva. If the anchor cell is destroyed, the VPCs will not form a vulva. This is the example of:

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#Question id: 15420

#Unit 5. Developmental Biology

signal from the inducing cell is necessary for initiating new gene expression in the responding cell. Without the inducing cell, the responding cell is not capable of differentiating in that particular way, phenomena known as:

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#Question id: 15419

#Unit 5. Developmental Biology

Doris Taylor’s research group used detergents to remove all the cells from a cadaveric rat heart, which leaves behind the natural extracellular matrix. An extracellular matrix scaffold can promote the differentiation and rebuilding of a beating heart. The researchers then infused this ECM scaffold with cardiomyocytes. Now these cells differentiated and organized into a functionally contracting “recellularized” heart. Which of the following statement is correct?

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#Question id: 15418

#Unit 5. Developmental Biology

In which type of interaction, the responding tissue has already been specified and needs only an environment that allows the expression of particular traits?

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#Question id: 15417

#Unit 5. Developmental Biology

Sequence of amphibian lens induction postulated by experiments on embryos of the frog Xenopus laevis ; EXCEPT

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#Question id: 15416

#Unit 5. Developmental Biology

Which of the following statements are regarding to lens induction in xenopus is incorrect?