undifferentiated hematopoietic stem cells would not express surface markers specific for mature cells from the multiple blood lineages (“Lin” markers). They used several approaches to eliminate cells in the bone marrow that did express these markers (Lin+ cells) and then examined the remaining (Lin+) population for its potential to continually give rise to all blood cells over the long term. Lin- cells were, indeed, enriched for this potential. what marker is   express If cells inter in lymphoid lineages?

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#Question id: 7003

#Unit 5. Developmental Biology

What structural adaptation in chickens allows them to lay their eggs in arid environments rather than in water?

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#Question id: 28769

#Unit 2. Cellular Organization

Autophagy occurs in the following sequence of steps___

a) Nucleation of autophagosome formation by ATG9

b) Digestion of the inner membrane and the luminal contents of the autophagosome.

c) Fusion of the autophagosome with lysosomes, catalyzed by SNAREs.

d) Induction by inhibition of mTOR complex 1

e) Closure of the membrane cup to form autophagosome

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#Question id: 5742

#Unit 8. Inheritance Biology

When an allotetraploid (AABB) is backcrossed to one of its progenitor species (AA), a sterile progeny is produced.  The genomic composition of this sterile individual can be best represented by

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#Question id: 33513

#Unit 2. Cellular Organization

Which one of the following statements regarding mutations in the mitochondria during aging is INCORRECT?

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#Question id: 28697

#Unit 2. Cellular Organization

Biosynthesis of all N-linked oligosaccharides begins in the rough ER with a preformed branched oligosaccharide precursor containing_____

i) Glucose (Glc)

ii) Galactose

iii) Mannose (Man)

iv) N-acetylglucosamine (GlcNAc)

v) N-acetylgalactosamine (GalNAc)