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: 9599

#XL - Q Biochemistry

The primary donor of PSI, P700, is a dimer of chlorophyll a molecules, in primary donor chlorophyll, additional chlorophylls molecules such as

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#Question id: 1363

#XL - Q Biochemistry

Which of the following statements best describes the difference between low-affinity integrins and high-affinity integrins?

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#Question id: 8901

#XL - T Zoology

The origin of the craniates occurred at roughly the same time as the

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#Question id: 4577

#XL - S Microbiology

Which of these is a statement that Darwin would have rejected?

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#Question id: 14811

#XL - S Microbiology

The development of both humoral and cell-mediated immune responses requires interaction of T cells with antigen that has been processed and presented together with MHC molecules. Which is correct for SUSCEPTIBILITY TO ANTIGEN PROCESSING AND PRESENTATION