Which of the following does not describe a general trait of macromolecules?

Correct Answer: C

Rationale: The correct answer is C. While many macromolecules contain carbon, hydrogen, and phosphorus, not all of them do. For example, lipids, a type of macromolecule, may not contain phosphorus. Choice A and B describe structural features that macromolecules can exhibit, whether as single chains or branched forms. Choice D is incorrect as not all macromolecules are used by the body, such as synthetic polymers or certain non-digestible fibers.

Correct Answer: B

Rationale: The correct answer is B. To measure the volume of a cube, you need to use a mathematical formula that takes into account the dimensions of the cube, specifically the length of its sides. Using a measuring wheel alone or a triple beam balance is not suitable for determining the volume of a cube. A graduated cylinder is used to measure the volume of liquids, not geometric solids like cubes.

Correct Answer: D

Rationale: Glucose is a monosaccharide, which is a simple sugar and not a macromolecule. Glycoproteins, DNA, and phospholipids are all examples of biological macromolecules. Glycoproteins are proteins covalently bonded to carbohydrates, DNA is a nucleic acid, and phospholipids are lipids that contain a phosphate group.

Correct Answer: A

Rationale: Qualitative research focuses on gathering non-numerical, descriptive data to explore experiences, behaviors, or perspectives. Collecting patient narratives aligns with qualitative research as it involves capturing detailed accounts of individuals' experiences or viewpoints. Choices B, C, and D involve more quantitative approaches by focusing on measurable quantities, observations, or structured note-taking, which are not characteristic of qualitative research methods.

Correct Answer: B

Rationale: The correct answer is B) Jejunum. The jejunum is the primary site of absorption in the small intestine due to its extensive surface area created by its long length and numerous circular folds called plicae circulares and finger-like projections called villi. These structural adaptations increase the absorptive capacity of the jejunum, allowing for efficient absorption of nutrients such as carbohydrates, proteins, and fats. Option A) Duodenum is the initial segment of the small intestine where most digestion occurs, but it is not the primary site of absorption. Option C) Ileum is the final segment of the small intestine where some absorption occurs, but it is not as significant as in the jejunum. Option D) Cecum is actually a part of the large intestine, not the small intestine, and is not involved in nutrient absorption. Understanding the specific functions and anatomical features of each region of the small intestine is crucial for students studying human anatomy and physiology, especially in relation to processes like digestion and absorption. Knowing the primary site of absorption helps students comprehend how nutrients are extracted from food and utilized by the body for energy and growth.