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Questions and Answers
Which of these is NOT one of the seven characteristics of life?
Which of these is NOT one of the seven characteristics of life?
What does MRS GREN stand for?
What does MRS GREN stand for?
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition
Prokaryotes have a nucleus.
Prokaryotes have a nucleus.
False
What is a unicellular organism?
What is a unicellular organism?
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Which of these is an example of a prokaryotic unicellular organism?
Which of these is an example of a prokaryotic unicellular organism?
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What type of reproduction do yeast cells use?
What type of reproduction do yeast cells use?
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Eukaryotic organisms can only be multicellular.
Eukaryotic organisms can only be multicellular.
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What organelle is known as the control center of the cell?
What organelle is known as the control center of the cell?
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A multi-cellular organism consists of millions of __________ cells.
A multi-cellular organism consists of millions of __________ cells.
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Study Notes
Characteristics of Life
- Living organisms exhibit seven fundamental characteristics: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition.
- Mnemonic to remember characteristics: MRS GREN.
- All organisms must display these features to be classified as living.
Types of Organisms
- Organisms are broadly categorized as prokaryotes and eukaryotes:
- Prokaryotes: Unicellular, lack a nucleus and membrane-bound organelles. Example: Bacteria (e.g., Escherichia coli, Streptococcus).
- Eukaryotes: Can be unicellular or multicellular, possess a nucleus and organelles. Examples include amoeba, yeast, and algae (e.g., Chlorella, Chlamydomonas).
Unicellular Organisms
- Composed of a single cell that performs all functions of life independently.
- Can be prokaryotic (e.g., bacteria) or eukaryotic (e.g., amoeba, paramecium, yeast).
- Eukaryotic unicellular organisms contain a nucleus and other organelles:
- Chlorella: Contains chloroplasts, appears green due to chlorophyll.
- Yeast: Reproduces asexually through budding.
Multicellular Organisms
- Comprise millions of specialized cells that interact to perform various functions.
- Each specialized cell contributes to the organism's overall life processes.
- If isolated, cells from multicellular organisms typically cannot survive independently.
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Description
Explore the foundational concepts of living organisms in this quiz. You will learn about unicellular, colonial, and multicellular life forms, along with the seven characteristics that define life. Test your understanding of movement, respiration, sensitivity, and more.
