Enzymes reduce the time it takes for a reaction to take place. true or false?

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

What causes darkening of the skin as melanin production increases