Pepsin is an enzyme found in the human stomach that breaks down protein. Pepsin will not break down starch. Which statement best explains this observation? A. Starches are too large to be affected by enzymes.
B. Enzymes only work for specific substrates.
C. Enzymes are denatured in the presence of carbohydrates.
D. Enzymes are carbohydrates, so they can’t act on other carbohydrates like starches.

Which of the following represents a negatively charged ion? of t 7

Which layer will become saturated first when rain falls?

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.