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Questions and Answers
Which of the following statements is true regarding tissues?
Which of the following statements is true regarding tissues?
- Tissues can carry out specific functions in isolation.
- Tissues are formed solely from one type of organ.
- Tissues consist of similar cells performing a common function. (correct)
- Tissues are groups of similar cells with varied functions.
What distinguishes an organ from a tissue?
What distinguishes an organ from a tissue?
- An organ is always larger than a tissue.
- An organ consists of similar cells.
- An organ is a structure formed by multiple tissues. (correct)
- An organ performs a singular function.
Which organelle is primarily responsible for providing strength and storage in plant cells?
Which organelle is primarily responsible for providing strength and storage in plant cells?
- Nucleus
- Chloroplasts
- Mitochondria
- Vacuoles (correct)
What is the primary role of the ribosome in a cell?
What is the primary role of the ribosome in a cell?
How does a scanning electron microscope differ from a transmission electron microscope?
How does a scanning electron microscope differ from a transmission electron microscope?
Which organelle is crucial for cellular respiration?
Which organelle is crucial for cellular respiration?
What is a key functional difference between prokaryotic and eukaryotic cells?
What is a key functional difference between prokaryotic and eukaryotic cells?
What role does the diaphragm serve in a microscope?
What role does the diaphragm serve in a microscope?
What function do chloroplasts perform in plant cells?
What function do chloroplasts perform in plant cells?
Which of the following best describes the role of the cell membrane?
Which of the following best describes the role of the cell membrane?
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Study Notes
Cell Structure and Function
- A cell is the fundamental unit of life, displaying all characteristics of life.
- Organelles are specialized components within a cell that perform distinct functions.
Tissues, Organs, and Organ Systems
- A tissue consists of a group of similar cells working together to perform a specific function.
- An organ is formed from a combination of different tissues that collaborate for a particular function.
- An organ system is a collection of various organs that function together to execute a complex role.
Microscopy
- A transmission electron microscope reveals detailed internal structures of a cell.
- A scanning electron microscope offers a three-dimensional view of a specimen's surface.
Microscope Components
- The diaphragm regulates the amount of light that illuminates the specimen.
- The fine focus knob is utilized for precise focusing of the image viewed under the microscope.
Unique Plant Cell Organelles
- Plant cells contain cell walls, chloroplasts, and vacuoles, which are absent in animal cells.
- The cell wall provides structural support and strength to the cell.
- Vacuoles help maintain cell rigidity and serve as storage areas.
- Chloroplasts are responsible for chlorophyll production and photosynthesis.
Key Cell Functions
- Ribosomes synthesize proteins, essential for cell function and structure.
- The nucleus governs cell activities and houses genetic material (DNA).
- Cytoplasm is the site where cellular reactions occur, facilitating metabolic processes.
- Mitochondria serve as the powerhouse of the cell, conducting respiration and energy production.
Cell Membrane Functions
- The cell membrane retains the contents of the cell.
- It aids in recognizing molecules that contact the cell.
- It regulates the movement of substances in and out of the cell while providing structural support.
Prokaryotic vs. Eukaryotic Cells
- Prokaryotic cells lack a nucleus and membrane-bound organelles.
- Eukaryotic cells have a defined nucleus and contain membrane-bound organelles.
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