Vg-1 and wnt are used in both frogs and chicks to establish a body axis, although in chicks this is the antero-posterior axis instead of the dorso-ventral axis. What is the region of the chick embryo that is thus analogous to the Nieuwkoop center?

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#Question id: 2066

#XL - S Microbiology

Which of the following statements describes a characteristic feature of a carrier protein in a plasma membrane?

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#Question id: 2067

#XL - S Microbiology

Which of the following would likely diffuse through the lipid bilayer of a plasma membrane most rapidly?

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#Question id: 2068

#XL - S Microbiology

Which of the following molecules dramatically increases the rate of diffusion of water across cell membranes?

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#Question id: 2069

#XL - S Microbiology

Which of the following processes includes all of the others?

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#Question id: 2070

#XL - S Microbiology

The sodium-potassium pump is called an electrogenic pump because it:

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#Question id: 2071

#XL - S Microbiology

Diffusion of ions across membranes through specific ion channels is driven by: