In the context of eukaryotic cells, which of the following best describes organelles?

• A. Groups of cells working together to form tissues
• B. Structures within cells composed of specialized components that perform specific functions
• C. Proteins that catalyze biochemical reactions
• D. Molecules that store genetic information

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the term 'organelles.' Organelles are specialized structures within eukaryotic cells that perform specific functions necessary for the cell's survival and operation.
2. Step 2: Eliminate the incorrect options by analyzing their definitions. For example, 'Groups of cells working together to form tissues' refers to multicellular organization, not organelles.
3. Step 3: Evaluate the option 'Proteins that catalyze biochemical reactions.' While enzymes are proteins that catalyze reactions, they are not organelles themselves.
4. Step 4: Consider the option 'Molecules that store genetic information.' This refers to DNA or RNA, which are not organelles but rather macromolecules within the cell.
5. Step 5: Identify the correct answer: 'Structures within cells composed of specialized components that perform specific functions.' This accurately describes organelles, such as the nucleus, mitochondria, and endoplasmic reticulum.