Nokea
Which mineral is a principal component of cell membranes?
- A. phosphorus
- B. magnesium
- C. iron
- D. iodine
Correct Answer: A
Rationale: Phosphorus is the correct answer. It is a key component of cell membranes, being part of the phospholipid bilayer that provides structure and controls the movement of substances in and out of cells. Magnesium, iron, and iodine do not serve as principal components of cell membranes. Magnesium is involved in various enzymatic reactions, iron is essential for oxygen transport, and iodine plays a role in thyroid hormone synthesis.
You may also like to solve these questions
Can a person with Celiac disease eat Poptarts that contain gluten?
- A. Yes
- B. No
- C. Only in small quantities
- D. Only if they are gluten-free Poptarts
Correct Answer: B
Rationale: A person with Celiac disease cannot consume Poptarts that contain gluten because gluten is a protein found in wheat, barley, and rye, triggering an autoimmune response in individuals with Celiac disease and damaging their small intestine. Even small quantities of gluten can lead to this harmful response, making choices 'A' and 'C' incorrect. While gluten-free Poptarts may be suitable for individuals with Celiac disease, regular Poptarts containing gluten are not safe for consumption by them, rendering choice 'D' incorrect as well.
What is the most common nutritional disorder for the older adult?
- A. Obesity
- B. Underweight
- C. Vitamin deficiency
- D. Dehydration
Correct Answer: A
Rationale: The correct answer is A: Obesity. Among older adults, obesity is the most common nutritional disorder. This is often attributed to reduced physical activity levels and changes in metabolism that occur with aging. Choice B (Underweight) is less common among older adults as compared to obesity. While choices C (Vitamin deficiency) and D (Dehydration) are important nutritional issues, they are generally not as prevalent as obesity in the older adult population.
What differentiates one amino acid from another?
- A. The amine group
- B. The acid group
- C. The side chain
- D. None of the above
Correct Answer: C
Rationale: The side chain, also known as the R group, is what differentiates one amino acid from another. It imparts unique properties to each amino acid, thereby influencing their roles and functions in proteins. The amine group (Choice A) and the acid group (Choice B) are components of all amino acids and do not cause the differences among various amino acids. Choice D is incorrect as it suggests that none of the given options account for the differences, which is not true as the side chain does.
Scurvy is caused by a deficiency of ascorbic acid (Vitamin C) because ascorbic acid is required for collagen synthesis. Is this statement true or false?
- A. TRUE
- B. FALSE
- C. Not applicable
- D. Not applicable
Correct Answer: A
Rationale: The statement is accurate. Scurvy is indeed caused by a deficiency in ascorbic acid, which is another name for Vitamin C. This vitamin plays a crucial role in the synthesis of collagen, a protein that helps in the formation and strength of skin, blood vessels, tissues, and bones. When the body lacks Vitamin C, it cannot produce enough collagen, leading to symptoms associated with scurvy such as bleeding gums and weakened immunity. The choice 'False' is incorrect because it contradicts the proven medical and scientific understanding of the causes of scurvy. Choices 'C' and 'D' are marked as 'Not applicable' because the question only requires a true or false answer.
James wants to know the recommended intake for iron for his gender and age. Which of the following would provide the best answer for James?
- A. EAR
- B. UL
- C. RDA
- D. DV
Correct Answer: C
Rationale: The Recommended Dietary Allowance (RDA) is the correct answer for James because it provides the daily intake level that meets the nutrient needs of most healthy individuals in a specific age and gender group. Choice A, EAR (Estimated Average Requirement), represents the average daily nutrient intake level estimated to meet the requirement of half the healthy individuals in a particular life stage and gender group. Choice B, UL (Tolerable Upper Intake Level), is the maximum daily intake unlikely to cause adverse health effects. Choice D, DV (Daily Value), is a general guide used for food labeling that represents how much a nutrient in a serving of food contributes to a daily diet based on a 2000-calorie daily intake.