CHOOSE THE BEST ANSWER

Multicellularity evolved multiple times independently in Eukaryotes, including in animals, plants, and fungi.

Which of the following is NOT necessary for the evolution of multicellular organisms from single-celled organisms?

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CHOOSE THE BEST ANSWER

Multicellularity evolved multiple times independently in Eukaryotes, including in animals, plants, and fungi.

Which of the following is NOT necessary for the evolution of multicellular organisms from single-celled organisms?

BlackTom AI · Accepted Answer

Here is the step-by-step analysis of each option in the context of how multicellularity could evolve from single-celled ancestors.
Option 1: The production of proteins that allow cells to stick together. This capability is fundamental to forming a multicellular organization, since adhesion between cells is required to maintain tissue structure and cooperative functioning. Without cell–cell adhesion, cells would remain independent units, making multicellularity unlikely. Thus this trait is a necessary condition.
Option 2: An increase in organism size and complexity. Growing larger and more complex bodies provides selective advantages in many scenarios and is commonly seen alongside multicellularity. While not absolutely guaranteed in every hypothetical path, increased size and structural/functional complexity typically accompany the transition, enabling specialization and coordination between cells. Therefore, this is generally considered a necessary or at least highly associated feature of true multicellularity.
Option 3: The ability to photosynthesize. Photosynthesis is a metabolic capacity that some multicellular lineages possess (e.g., plants) but it is not a universal prerequisite for multicellularity. There are well-known multicellular organisms, such as animals, fungi, and many protists, that do not photosynthesize. Therefore, this trait is not required for the evolution of multicellularity and can arise or be absent independently of multicellular organization.
Option 4: The division of labor among cells. Division of labor, or cellular differentiation, is a hallmark of multicellular life, enabling specialized cell types to perform distinct functions and support the organism as a whole. This is a classic driver and consequence of multicellularity, making it a necessary feature.
In summary, options 1, 2, and 4 describe features that are commonly necessary or closely linked to multicellular organization, while option 3—photosynthesis—is not required and can be absent in multicellular lineages.

BIOL 1001 (001-013) Exam 3: Unit 3

CHOOSE THE BEST ANSWER Multicellularity evolved multiple times independently in Eukaryotes, including in animals, plants, and fungi. Which of the following is NOT necessary for the evolution of multicellular organisms from single-celled organisms?

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