All the following statements regarding the digestive enzymes are true except:
1. They are hydrolases.
2. They are carbohydrates.
3. They have an optimum pH.
4. They speed up a chemical reaction.

Around 60 – 70 % of starch is broken down to maltose in the duodenum by:
1. pancreatic amylase
2. trypsin
3. maltase
4. salivary amylase

Lactose intolerance is a common digestive problem. Patients with this condition lack:
1. amylase
2. galactose
3. rennin
4. lactase

Identify the incorrectly matched pair:
1. fats -- lipase
2. starch -- salivary amylase
3. maltose -- lactase
4. protein -- trypsin

In humans, the energy source that provides energy the quickest is:
1. protein
2. carbohydrate
3. lipid
4. vitamins

The calorific value is highest for:
1. carbohydrate
2. protein
3. fat
4. fiber

The coenzyme NAD, found in all living cells and involved in redox reactions, is related to:
1. vitamin D
2. riboflavin
3. niacin
4. vitamin K

A serious eating disorder marked by binge eating, followed by methods to avoid weight gain is:
1. obesity
2. bulimia
3. anorexia nervosa
4. pellagra

Situated between the circular muscle layer and the longitudinal muscle layer in the lower esophagus, stomach, and intestines, the major nerve supply to the gastrointestinal tract that controls GI tract motility is the:
1. myenteric plexus
2. muscularis
3. submucosal plexus
4. serosa

HCl secreted by the gastric mucosa does not:
1. kill bacteria
2. catalyze the hydrolysis of peptide bonds
3. denature dietary proteins
4. cause the activation of pepsin