Skip to main content
뒤로

October 9th (start of unit 4)

컨트롤 버튼이 '내비게이션' 모드로 변경되었습니다.
1/21

이 집합의 용어 (21)

  • Cell Theory?

    Cell theory states that all living things are composed of cells and all cells come from other cells.

  • Robert Hooke's Contribution to cell theory?

    Robert Hooke (1665) was the first person to look at a plant through a microscope and made the term 'cellulae' for tiny compartments.

  • Light Microscope (LM) Function?

    LM uses visible light passing through a sample and glass lenses to magnify the image, projecting it into the eye or a camera.

  • Magnification vs Resolution?

    Magnification: increases image size (LM 230x);

    Resolution: measures image clarity and the ability to distinguish two objects being separate from each other.

  • Resolution Limits of Light Microscopes?

    Light microscopes have a resolution limit of about 0.2 μm and cannot improve beyond ~1000X magnification.

  • Electron Microscopes (EM) ?

    EM began in 1950s using electron beams and its 100 folds better then the LM but can only view dead samples and produces black and white images.

  • Scanning Electron Microscope (SEM)?

    SEM studies cell surface architecture by coating samples with gold and producing 3D images from scattered electrons.

  • Transmission Electron Microscope (TEM)?

    TEM passes electrons through thin specimen sections stained with heavy metals to produce detailed internal cell images.

  • Limitations of Electron and Light Microscopy?

    EM cannot view live samples; LM cannot see many small cell parts or microorganisms.

  • Surface Area to Volume Ratio in Cells?

    Smaller cells have a higher surface area to volume ratio, facilitating efficient exchange with the environment. where large cells has less.

  • Plasma Membrane Structure?

    The plasma membrane is a flexible boundary made of a phospholipid bilayer that controls passage of substances in and out of the cell.

  • Types of cells?

    Prokaryotic and Eukaryotic.

  • Prokaryotic Cells Characteristics?

    Prokaryotes are small, simple cells without membrane-bound organelles, with DNA in a nucleoid region.

  • Prokaryotic Cell Wall and Capsule?

    The cell wall is a rigid shell protecting and maintaining shape; the capsule is a sticky outer coat aiding attachment.

  • Flagella in Prokaryotes?

    Flagella are long projections that propel prokaryotic cells through their environment; not all prokaryotes have them.

  • Eukaryotic Cells Distinct Features?

    Eukaryotes have a membrane-enclosed nucleus and many membrane-bound organelles performing specific functions.

  • Common Structures in All Cells?

    All cells have a plasma membrane, ribosomes, cytosol, DNA, and cytoplasm (excluding the nucleus interior).

  • Organelles and Their Functions?

    Organelles are membrane-bound structures with specific roles: genetic control, molecule processing, energy conversion, and structural support.

  • Organelles Unique to Animal Cells?

    Animal cells uniquely have lysosomes, centrosomes, and sometimes flagella and cilia.

  • Organelles Unique to Plant Cells?

    Plant cells uniquely have a rigid cellulose cell wall, plasmodesmata, chloroplasts, and a large central vacuole.

  • How do organelles support cell metabolism?

    Each organelle maintains specific internal conditions needed for enzymes to function properly and support cellular metabolism.