Clinical Nutritionist CCN Gastrointestinal Health and Nutrition

Question 1

Which probiotic strain has the most robust clinical evidence for preventing antibiotic-associated diarrhea?

Accepted Answer

Lactobacillus rhamnosus GG

Answer

Lactobacillus acidophilus

Answer

Bifidobacterium longum

Answer

Streptococcus thermophilus

Question 2

The primary site of vitamin B12 absorption in the gastrointestinal tract is the:

Accepted Answer

Terminal ileum

Answer

Stomach

Answer

Duodenum

Answer

Jejunum

Question 3

Which dietary fiber type has the strongest evidence for lowering LDL cholesterol?

Accepted Answer

Soluble fiber (beta-glucan)

Answer

Insoluble fiber (cellulose)

Answer

Resistant starch

Answer

Lignin

Question 4

Increased intestinal permeability ('leaky gut') is primarily caused by dysregulation of:

Accepted Answer

Tight junction proteins

Answer

Mucus layer thickness

Answer

Bile acid secretion

Answer

Brush border enzymes

Question 5

Short-chain fatty acids (SCFAs) produced by colonic fermentation of fiber primarily serve as the main energy source for:

Accepted Answer

Colonocytes

Answer

Liver hepatocytes

Answer

Small intestinal enterocytes

Answer

Skeletal muscle cells

Question 6

Celiac disease causes malabsorption primarily by:

Accepted Answer

Autoimmune destruction of intestinal villi triggered by gluten

Answer

Excess mucus secretion blocking nutrient uptake

Answer

Bacterial overgrowth in the small intestine

Answer

Deficiency of pancreatic digestive enzymes

Question 7

By definition, a prebiotic must be:

Accepted Answer

A non-digestible ingredient that selectively stimulates beneficial gut bacteria

Answer

A live beneficial microorganism

Answer

An antimicrobial compound that eliminates pathogens

Answer

A fermented dairy product containing live cultures