In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by:

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#Question id: 27336

#XL - T Zoology

Match the nitrogenous bases in Group I with their corresponding chemical names in Group II.

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#Question id: 2196

#XL - S Microbiology

Substance X is a charged molecule of small molecular weight. It is found at higher concentrations outside of cells than inside. How might substance X enter cells?

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#Question id: 914

#XL - Q Biochemistry

Lipoprotein lipase acts in:

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#Question id: 945

#XL - Q Biochemistry

A key precursor in the synthesis of aromatic amino acids (tryptophan, tyrosine and phenylalanine) is ________.

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#Question id: 1705

#XL - Q Biochemistry

What is the single best definition of the most common form of antigen recognized by the T-cell receptor (TCR)