In cellular respiration, where do the high-energy electrons that move through the electron transport chain originate? a) water b) nadh and fadh2 c) nad+ and fad d) glucose

The correct answer is -

B) NADH and FADH2.

NADH and FADH2 are electron carriers that provide electrons, which move across four protein complex (Complex I to complex IV) in the inner mitochondrial membrane.

These are high energy electrons and ultimately help in the generation of large amount of energy in the form of ATP.

The flow of electrons across protein complex leads to change in shape their shapes, due to which protons are pumped across the inner membrane ( that is from mitochondrial matrix to the intermembrane space).

As a result, a concentration gradient of Hydrogen ions is formed across the membrane.

By diffusion, the hydrogen ions travel back through a special channel called ATP sythase. This channel utilizes the energy of the flow of the Hydrogen ions to form ATP.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

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.

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