[methyl-14C]pyruvate was administered to isolated guinea pig liver cells in the presence of sufficient malonate to completely block the action of succinate dehydrogenase. After a time, isocitrate is isolated and found to contain radiolabeled carbon at both the —CH2— and the —CHOH— carbons, instead of just at

the —CH2— carbon. Explain how the —CHOH— got radiolabeled.

velocity and height

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

answer; both surfaces of the membrane are nonpermeable