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 statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.