The paradigmatic adult stem cell niche, contains several cell types that coordinate HSC development, including in column I and column II

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#Question id: 4978

#Unit 11. Evolution and Behavior

The dicynodonts survived the mass extinction that was most closely correlated in time, if not in cause, with

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#Question id: 33363

#Unit 1. Molecules and their Interaction Relevant to Biology

An antibody binds to an antigen with a Kd of 5 X10^-8 M. At what concentration of antigen will θ be 0.2

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#Question id: 30110

#Unit 1. Molecules and their Interaction Relevant to Biology

The ribose phosphate group of purine nucleotide is taken from which compound?

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#Question id: 13201

#Unit 6. System Physiology – Plant

Phloem loading in the apoplastic pathway thought to mediate the transport of sucrose from the apoplast into the sieve element– companion cell complex. Which of the following  are involved in such sucrose transporting by apoplast?

a) Sucrose is at a higher concentration in the sieve element–companion cell complex indicates that sucrose is actively transported against its chemical-potential gradient

b) Sugars transport from the apoplast into the sieve elements and companion cells energy driven process

c) Phloem loading in the apoplastic pathway involves a sucrose–H+ symporter

d) the route of phloem loading is−mesophyll cells→ bundle sheath cells→ phloem parenchyma cell→ ordinary companion cell→ sieve elements

Which of the following is incorrect?

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#Question id: 2274

#Unit 2. Cellular Organization

Unlike those of prokaryotes, eukaryotic cell walls are composed of