Q: Which of the following equations correctly calculates the Recommended Dietary Allowance (RDA) for protein for a healthy adult weighing 70 kg?

$$RDA = 0.8 \\ \times 70 = 56 \\ \text{grams}$$

Q: A 2,000 kcal diet recommends that 10-35% of calories come from protein. What is the range of protein intake in grams per day? (Assume 4 kcal/g for protein)

$$\text{Lower limit:} \\ \frac{0.10 \times 2000}{4} = 50 \\ \text{g}, \\ \text{Upper limit:} \\ \frac{0.35 \times 2000}{4} = 175 \\ \text{g}$$

Question 1

Which of the following best describes the difference between whole grains and enriched grains?

Accepted Answer

Whole grains contain all parts of the grain kernel, while enriched grains have had some nutrients added back after processing.

Question 2

A patient with type 2 diabetes is advised to consume more dietary fiber. Which of the following is a primary reason for this recommendation?

Accepted Answer

Dietary fiber slows glucose absorption, helping to regulate blood sugar levels.

Question 3

Which of the following equations correctly calculates the Recommended Dietary Allowance (RDA) for protein for a healthy adult weighing 70 kg?

Accepted Answer

$$RDA = 0.8 \ 	imes 70 = 56 \ 	ext{grams}$$

Question 4

Which of the following statements about lipid digestion is correct?

Accepted Answer

Most lipid digestion occurs in the small intestine with the help of bile and pancreatic lipase.

Question 5

A food label lists the following ingredients: whole wheat flour, sugar, salt, and yeast. Which type of carbohydrate is primarily present in this food?

Accepted Answer

Complex carbohydrates (starch and fiber)

Question 6

Which of the following best describes the process of deamination in protein metabolism?

Accepted Answer

The removal of an amino group from an amino acid, producing ammonia and a carbon skeleton.

Question 7

Which of the following is a health risk associated with excessive intake of saturated and trans fats?

Accepted Answer

Increased risk of cardiovascular disease due to elevated LDL cholesterol.

Question 8

A 2,000 kcal diet recommends that 10-35% of calories come from protein. What is the range of protein intake in grams per day? (Assume 4 kcal/g for protein)

Accepted Answer

$$	ext{Lower limit:} \ \frac{0.10 	imes 2000}{4} = 50 \ 	ext{g}, \ 	ext{Upper limit:} \ \frac{0.35 	imes 2000}{4} = 175 \ 	ext{g}$$

Question 9

Which of the following statements about alcohol metabolism is correct?

Accepted Answer

Alcohol is primarily metabolized in the liver by the enzyme alcohol dehydrogenase.

Question 10

Which of the following is a distinguishing feature of phospholipids compared to triglycerides?

Accepted Answer

Phospholipids contain a phosphate group and are key components of cell membranes.

Question 11

A person consumes 300 grams of carbohydrates in a 2,400 kcal diet. What percentage of their total energy intake comes from carbohydrates? (Assume 4 kcal/g for carbohydrates)

Accepted Answer

$$\frac{300 	imes 4}{2400} 	imes 100 = 50\%$$

Question 12

Which of the following best describes the difference between essential and non-essential amino acids?

Accepted Answer

Essential amino acids must be obtained from the diet, while non-essential amino acids can be synthesized by the body.

Question 13

Which of the following is a primary function of cholesterol in the body?

Accepted Answer

It serves as a precursor for steroid hormones and vitamin D synthesis.

Question 14

A patient is found to have a total cholesterol of 250 mg/dL, LDL of 170 mg/dL, and HDL of 35 mg/dL. According to optimal recommendations, which of the following is true?

Accepted Answer

All values are above or below optimal recommendations, indicating increased cardiovascular risk.

Question 15

Which of the following best describes the process of denaturation of proteins?

Accepted Answer

The alteration of a protein's shape due to heat, acid, or agitation, resulting in loss of function.

Question 16

Which of the following is a characteristic of sugar substitutes compared to natural sugars?

Accepted Answer

Sugar substitutes provide sweet taste with little or no calories.

Question 17

Which of the following scenarios best illustrates the concept of nitrogen balance?

Accepted Answer

A healthy adult maintaining their body weight and muscle mass has nitrogen intake equal to nitrogen excretion.

Question 18

Which of the following is a short-term effect of excessive alcohol consumption?

Accepted Answer

Impaired judgment and coordination due to central nervous system depression.

Question 19

Which of the following best explains why unsaturated fats are considered healthier than saturated fats?

Accepted Answer

Unsaturated fats can help lower LDL cholesterol and reduce cardiovascular risk.

Comprehensive Study Notes: Carbohydrates, Lipids, Proteins, and Alcohol (Chapters 4–7)

Study Guide - Practice Questions

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