Question

In which pairing are both transporters symports?

a)	glutamate-aspartate transporter and phosphate translocase

b)	phosphate translocase and pyruvate translocase

c)	adenine nucleotide translocase and phosphate translocase

d)	adenine nucleotide translocase and glutamate-aspartate transporter

e)	pyruvate translocase and adenine nucleotide translocase

Answer 1

Option b)phosphate translocase and pyruvate translocase

In oxidative phosphorylation,phosphate translocase-helps in symport (Transport in same Direction)of 1 H2P04- & 1H+ into mitochondrial Matrix.

Similarly,pyruvate translocase moves 1 Pyruvate nad 1 H+ molecules from cytosol into mitochondrial Matrix(Symporter).

Others-glutamate-aspartate transporter,adenine nucleotide translocase are Antiporters.

*glutamate-aspartate transporter:transport Glutamate from cytosol into matrix and Aspartate from matrix to Cytosol.(Antiport)

*adenine nucleotide translocase:This is an Antiport between adenine nucleotide & ADP.(adenine nucleotide From matrix to Intermembrane Space & ADP to Matrix)