CDN Nutritional Science & Dietetics 3

Question 1

During prolonged fasting, which metabolic state predominates to spare muscle protein?

Accepted Answer

Ketosis

Answer

Ketosis allows the brain and other tissues to use ketone bodies as an alternative fuel, reducing the need to catabolize muscle protein for gluconeogenesis.

Question 2

Which vitamin functions as a coenzyme in transamination reactions involving amino acid metabolism?

Accepted Answer

Pyridoxine (B6)

Answer

Pyridoxal phosphate (PLP), the active form of vitamin B6, is the coenzyme required by aminotransferases (transaminases) that transfer amino groups between molecules.

Question 3

A Registered Dietitian Nutritionist calculates a patient's protein needs at 1.5 g/kg/day. The patient weighs 176 lbs. How many grams of protein are required daily?

Accepted Answer

120 g

Answer

176 lbs ÷ 2.2 = 80 kg; 80 kg × 1.5 g/kg = 120 g of protein per day.

Question 4

Which mineral is a structural component of thyroid hormones T3 and T4?

Accepted Answer

Iodine

Answer

Iodine is directly incorporated into the thyroid hormones triiodothyronine (T3) and thyroxine (T4), which regulate metabolic rate.

Question 5

The glycemic index (GI) of a food is most directly affected by which factor?

Accepted Answer

Starch structure and fiber content

Answer

The ratio of amylose to amylopectin and the amount and type of dietary fiber primarily determine how rapidly a food raises blood glucose, thus affecting GI.

(CDN) Certified Dietician Nutritionist Practice Test

(CDN) Certified Dietician Nutritionist Practice Test

CDN Nutritional Science & Dietetics 3