All flashcards
Flashcard 1: Which evidence best distinguishes multicellular from colonial: shared tissues and organs or just grouped similar cells?
Answer: Shared tissues and organs. True multicellular organisms share resources between cells.
Flashcard 2: Which option is a correct example of a multicellular organism commonly taught in middle school?
Answer: Human. Humans have trillions of specialized cells.
Flashcard 3: Which option is a correct example of a unicellular organism commonly taught in middle school?
Answer: Bacterium. Bacteria are single-celled prokaryotes.
Flashcard 4: Identify the evidence-based conclusion: a single cell swims, eats, and reproduces. What type is it?
Answer: Unicellular. All functions in one cell indicates unicellularity.
Flashcard 5: Identify the evidence-based conclusion: an organism has muscle tissue and nerve tissue. What type is it?
Answer: Multicellular. Tissue types prove cell specialization exists.
Flashcard 6: Which type of organism commonly shows both sexual reproduction and asexual reproduction in its life cycle?
Answer: Multicellular organisms. Complex organisms have multiple reproductive strategies.
Flashcard 7: What is the correct comparison of reproduction: which type commonly reproduces asexually by cell division?
Answer: Unicellular organisms. Binary fission is simple cell division.
Flashcard 8: Identify the correct statement about size limits: which type is usually smaller due to surface area limits?
Answer: Unicellular organisms are usually smaller. Surface area limits single cell size.
Flashcard 9: Which evidence best supports that an organism is multicellular: specialized tissues or a single cell doing all tasks?
Answer: Specialized tissues. Different cell types indicate multicellularity.
Flashcard 10: What is the correct order of organization in multicellular organisms from simplest to most complex?
Answer: Cells → tissues → organs → organ systems → organism. Each level builds on the previous one.
Flashcard 11: Which level of organization is directly above cells in multicellular organisms?
Answer: Tissues. Groups of similar cells form tissues.
Flashcard 12: What term describes different cell types working together in a multicellular organism?
Answer: Division of labor (cell specialization). Specialized cells work together like a team.
Flashcard 13: Which type of organism shows specialization, where different cells do different jobs?
Answer: Multicellular organisms. Cell specialization increases efficiency and complexity.
Flashcard 14: Which type of organism has cells that must carry out all life processes within one cell?
Answer: Unicellular organisms. No other cells exist to share the workload.
Flashcard 15: What is the definition of a multicellular organism?
Answer: An organism made of many cells that often specialize for tasks. Multiple cells allow for division of labor and efficiency.
Flashcard 16: What is the definition of a unicellular organism?
Answer: An organism made of one cell that performs all life functions. Single cells must be self-sufficient for survival.
Flashcard 17: Which evidence indicates cell communication is necessary: independent cells or coordinated organ systems?
Answer: Coordinated organ systems. Systems require cell-to-cell communication.
Flashcard 18: What is the main reason many multicellular organisms need internal transport systems?
Answer: Many cells are far from the surface for diffusion to supply needs. Interior cells can't directly exchange with environment.
Flashcard 19: Which type of organism typically relies mostly on diffusion across the cell membrane for exchange?
Answer: Unicellular organisms. Direct membrane contact with environment enables exchange.
Flashcard 20: What is homeostasis, and do both unicellular and multicellular organisms maintain it?
Answer: Stable internal conditions; both types maintain homeostasis. All organisms regulate their internal environment.
Flashcard 21: Which key evidence shows an organism is unicellular when viewed under a microscope?
Answer: Only one cell is observed performing all life functions. No other cells are present to share life functions.
Flashcard 22: What is the term for a group of similar cells working together in multicellular organisms?
Answer: Tissue. Similar cells group together to perform a specific function.
Flashcard 23: Which evidence best supports that cells in an organism communicate: shared cytoplasm only, or signaling between cells?
Answer: Signaling between cells. Cell-to-cell signaling allows coordination in multicellular organisms.
Flashcard 24: Which statement correctly compares growth: unicellular grow by cell enlargement or by adding cells?
Answer: Unicellular: enlargement; multicellular: adding cells by division. Single cells grow bigger; multicellular organisms add more cells.
Flashcard 25: What is a key advantage of multicellular organisms compared with unicellular organisms?
Answer: Division of labor through specialized cells increases efficiency. Specialized cells allow complex organisms to perform tasks better.
Flashcard 26: What is a key advantage of unicellular organisms compared with multicellular organisms?
Answer: They reproduce quickly and require fewer resources. Simple structure allows rapid reproduction with minimal energy.
Flashcard 27: Which statement is evidence of division of labor: each cell does all tasks or cells have specific roles?
Answer: Cells have specific roles. Division of labor means different cells do different jobs.
Flashcard 28: What evidence would show a sample is a colony, not a true multicellular organism?
Answer: Similar cells live together but show little specialization. Colonies lack the cell differentiation of true multicellular organisms.
Flashcard 29: Which option is evidence of multicellularity: cells connected and communicating or a single free-living cell?
Answer: Cells connected and communicating. Cell communication is essential for coordinated multicellular life.
Flashcard 30: Identify the main advantage of multicellularity compared with unicellularity.
Answer: Greater efficiency from specialized cells working together. Division of labor allows complex functions.