Carbohydrates are
a group of organic compounds containing lithium, hydrogen, and oxygen,
a group of inorganic compounds containing hydrogen, and oxygen
a group of organic compounds containing carbon, nitrogen, and oxygen.
a group of organic compounds containing carbon, hydrogen, and oxygen
The Correct Answer is D
A. Carbohydrates do not contain lithium. Lithium is not a naturally occurring element in organic compounds relevant to nutrition or energy metabolism in the human body, so this option is incorrect.
B. Carbohydrates are classified as organic compounds because they contain carbon bonded to hydrogen and oxygen. While they do contain hydrogen and oxygen, being an organic molecule requires the presence of carbon-hydrogen bonds. Therefore, calling them inorganic is incorrect.
C. Carbohydrates do not contain nitrogen as a primary component. Nitrogen is found in proteins and nucleic acids but is not part of the basic chemical structure of carbohydrates.
D. Carbohydrates are a group of organic compounds composed of carbon, hydrogen, and oxygen atoms, typically with a hydrogen-to-oxygen ratio of 2:1, similar to water (H₂O). They are a primary source of energy for the body because they can be broken down into glucose, which is used in cellular respiration to produce ATP, the energy currency of cells. Carbohydrates also serve as storage molecules, such as glycogen in animals and starch in plants, and structural molecules, like cellulose in plant cell walls and chitin in the exoskeletons of some animals. They are classified into monosaccharides (simple sugars like glucose and fructose), disaccharides (such as sucrose and lactose), and polysaccharides (starch, glycogen, and cellulose), each serving distinct roles in energy provision, storage, and structural support.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","D","E"]
Explanation
A. Blood does not produce hormones; endocrine glands such as the thyroid, adrenal glands, and pancreas produce hormones. Blood serves as a transport medium for hormones but is not their source.
B. Blood helps maintain body temperature by distributing heat generated by metabolism throughout the body and by constricting or dilating blood vessels to conserve or release heat as needed.
C. Blood itself does not heal injuries. While it carries platelets and clotting factors essential for clot formation, the actual tissue repair process occurs through cellular and tissue mechanisms, not the blood directly.
D. Blood plays a critical role in regulating the immune system by transporting white blood cells, antibodies, and other immune components to sites of infection or injury, helping defend the body against pathogens.
E. Blood transports essential substances such as nutrients, oxygen, and hormones to tissues and carries waste products like carbon dioxide and urea to organs such as the lungs and kidneys for excretion, supporting overall homeostasis.
Correct Answer is B
Explanation
A. Meals on Wheels provides nutritious meals to older adults, particularly those who are homebound, to support health and prevent malnutrition. It is not a program designed for children.
B. The National School Lunch Program (NSLP) is a federally assisted program that provides low-cost or free lunches to children in public and nonprofit private schools during the school day. The program aims to improve the nutrition and overall health of children, ensuring they receive balanced meals that meet federal dietary guidelines. It also plays a role in reducing food insecurity and supporting academic performance.
C. The Senior Farmers Market Nutrition Program provides coupons to low-income seniors to purchase fresh fruits, vegetables, and herbs at farmers’ markets. It is targeted at older adults, not children.
D. The Supplemental Nutrition Assistance Program (SNAP) offers financial assistance to low-income individuals and families to buy groceries. While it supports household nutrition, it is not specific to children or designed for school-based meals.
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