The nutrient that is needed in small amounts that helps to regulate body processes and perform chemical reactions is

Correct Answer: A

Rationale: Vitamins are required in small amounts to regulate body processes and support various chemical reactions in the body.

Correct Answer: A

Rationale: Disaccharides, like sucrose, consist of two monosaccharides linked together and are broken down into simpler sugars during digestion.

Correct Answer: A

Rationale: Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before the food reaches the stomach.

Correct Answer: C

Rationale: Protein digestion begins in the stomach with pepsin and is completed in the ileum by proteolytic enzymes from the pancreas and intestinal mucosa.

Correct Answer: A

Rationale: Substances testing positive for both the biuret test (protein) and Benedict's test (reducing sugar) indicate the presence of both protein and reducing sugars.