6. What are groups of similar cells called?
Answer: D
Groups of similar cells are called tissue.
Tissues are defined as groups of similar cells that work together to perform a specific function. This classification is fundamental in biology and anatomy, highlighting the organization of cells into functional units.
A) Membrane
Membranes are not groups of similar cells; rather, they are structures composed of lipid bilayers that separate different compartments within cells or between cells and their environment. Thus, this option is incorrect in the context of the question.
B) System
A system refers to a collection of related organs and structures that work together to perform complex functions in an organism. While systems may contain tissues, they are not groups of similar cells themselves, making this option incorrect.
C) Organ
An organ is a structure composed of different types of tissues working together to perform specific functions. Although organs consist of tissues, they are not defined as groups of similar cells, which makes this option incorrect.
D) Tissue
Tissue is the correct answer as it specifically refers to groups of similar cells that share a common function. This classification is essential in understanding how cells collaborate to form the structural and functional basis of organs.
Conclusion
Tissue is the definitive answer because it accurately describes groups of similar cells working together, which is the key concept in this question. The other options fail to represent this fundamental biological organization, as they refer to broader structures or functions that include tissues but do not define them.