Embryology

38. What is true about formation of the left-right axis?

1

שאלה #182900

		A. It requires the action of cilia in the node
		B. It requires expression of the signal NODAL
		C. if left-right organization of organs is random, it is worse than mirror-image
		D. It involves flow of molecules in a leftward direction
		E. A+B
		F. B+C
		G. All of the above

נערך לפני שבוע

מיין לפי

41. Which tissue develops from the mesoderm?

1

שאלה #182902

		Neural tube
		Skin
		Muscle
		Brain

נערך לפני שבוע

מיין לפי

42. Which tissue develops from the ectoderm??

1

שאלה #182903

		Neural crest
		Liver
		Vertebra
		Blood and blood vessels

נערך לפני שבוע

מיין לפי

43. Which sentence/s best describe the expression of the gene Sox2 in the neural tube in development?

1

שאלה #182904

		A. The expression in the entire neural tube is driven by the same enhancer
		B. The expression in the entire neural tube is driven by the same promote
		C. The expression in the neural tube is driven by many enhancer elements
		D. The expression in the neural tube is driven by many promoter elements
		E. B+C
		F. A+D
		G. C+D

נערך לפני 5 ימים

מיין לפי

44. What is true about pioneer transcription factors?

1

שאלה #182905

		Can bind closed (condensed) chromatin
		Are a kind of histone
		Are always considered “master regulators”
		Transmit information between cells

נערך לפני שבוע

מיין לפי

45. How did MyoD change our understanding of the Waddington landscape model?

1

שאלה #182906

		Under some conditions, cells can “roll back” differentiation all the way to pluripotency (de-differentiation)
		Under some conditions, cells can switch directly to an alternate fate (trans-differentiation)
		Once cells fully differentiate, they can never change their fate
		Cell fate decisions are made when cells respond to cues and choose between alternate “valleys”

נערך לפני שבוע

מיין לפי

46. What is true about MyoD and Pax6?

1

שאלה #182907

		A. Both are considered “master regulators”
		B. Only MyoD is considered a master regulator
		C. Both function as master regulators in the same way
		D. MyoD is unique because it drives only one cell fate, while Pax6 is expressed in several tissues
		E. A+B
		F. A+D
		G. C+D

נערך לפני שבוע

מיין לפי

48. What is false about Hox genes?

1

שאלה #182908

		Duplicated in evolution both by tandem and whole-genome duplications
		Respond to Retinoic Acid signaling to determine their expression pattern
		Required for the establishment of left-right asymmetry
		Expressed in overlapping patterns during development

נערך לפני שבוע

מיין לפי

49. How did the “Yamanaka factors” change our understanding of the Waddington landscape model?

1

שאלה #182909

		Under some conditions, cells can “roll back” differentiation all the way to pluripotency (de-differentiation)
		Under some conditions, cells can switch directly to an alternate fate (trans-differentiation)
		Once cells fully differentiate, they can never change their fate
		Cell fate decisions are made when cells respond to cues and choose between alternate “valleys”

נערך לפני שבוע

מיין לפי

52. What is true about Drosophila segmentation?

1

שאלה #182911

		Involves several stages, each with unique genes and dependent on the previous
		The first steps involve transcription factors acting as morphogens
		Hox genes appear as a last step in the process
		Coupled to formation of the anterior-posterior axis
		All of the above

נערך לפני שבוע

מיין לפי

Discuss, Learn and be Happy דיון בשאלות

38. What is true about formation of the left-right axis?

41. Which tissue develops from the mesoderm?

42. Which tissue develops from the ectoderm??

43. Which sentence/s best describe the expression of the gene Sox2 in the neural tube in development?

44. What is true about pioneer transcription factors?

45. How did MyoD change our understanding of the Waddington landscape model?

46. What is true about MyoD and Pax6?

48. What is false about Hox genes?

49. How did the “Yamanaka factors” change our understanding of the Waddington landscape model?

52. What is true about Drosophila segmentation?

בקשה לשינוי התשובה / תיקון שאלה gavel

בקשה למחיקת השאלהmood_bad

בקשה לשינוי התשובה / תיקון שאלה

בקשה למחיקת השאלה