NTA Nutritional Science Fundamentals 4

Question 1

Which fat-soluble vitamin requires conversion to its active form 1,25-dihydroxyvitamin D3 (calcitriol) through a two-step hydroxylation process involving the liver and kidneys?

Accepted Answer

Vitamin D

Answer

Vitamin D undergoes first hydroxylation in the liver to 25-hydroxyvitamin D and then a second hydroxylation in the kidneys to form the active hormone calcitriol (1,25-dihydroxyvitamin D3).

Question 2

What type of dietary fiber is most associated with lowering LDL cholesterol by binding bile acids in the intestinal lumen?

Accepted Answer

Soluble viscous fiber such as beta-glucan and pectin

Answer

Soluble viscous fibers like oat beta-glucan and pectin form a gel in the intestine that binds bile acids, forcing the liver to use cholesterol to synthesize new bile, thereby reducing LDL levels.

Question 3

Which essential fatty acid serves as the precursor for eicosanoids with generally pro-inflammatory effects?

Accepted Answer

Arachidonic acid (AA)

Answer

Arachidonic acid (AA), an omega-6 fatty acid, is the primary precursor for series-2 prostaglandins, thromboxanes, and series-4 leukotrienes, which tend to be pro-inflammatory.

Question 4

What is the primary reason the NTA emphasizes consuming nutrient-dense, whole foods rather than relying on isolated supplements?

Accepted Answer

Whole foods provide synergistic cofactors and phytonutrients that enhance nutrient bioavailability and utilization

Answer

The NTA's whole-food philosophy recognizes that nutrients in food exist within a complex matrix of cofactors, phytonutrients, and enzymes that work synergistically to enhance absorption and utilization.

Question 5

Which of the following best describes the process of beta-oxidation?

Accepted Answer

The sequential removal of two-carbon units from fatty acids to produce acetyl-CoA for energy

Answer

Beta-oxidation is the catabolic process occurring in the mitochondria where fatty acids are repeatedly cleaved to yield two-carbon acetyl-CoA units that enter the TCA cycle for ATP production.

(NTA) Nutritional Therapy Association Certification Practice Test

(NTA) Nutritional Therapy Association Certification Practice Test

NTA Nutritional Science Fundamentals 4