QUESTION IMAGE
Question
sc.912.l.14.4 review the parts (structure and function) of the compound microscope
- label the following parts of a compound microscope and describe below each of their functions.
- describe the differences between the compound light microscope, dissecting microscope, transmission electron microscope, and scanning electron microscope.
sc.912.l.14.3 compare and contrast the general structures of plant and animal cells. compare and contrast the general structures of prokaryotic and eukaryotic cells.
- complete the following chart for prokaryotes and eukaryotes.
Brief Explanations
Question 15:
- g (Ocular Lens): Magnifies the image from the objective lens for viewing.
- h (Body Tube): Maintains the distance between the ocular and objective lenses.
- i (Revolving Nosepiece): Holds objective lenses and allows switching between them.
- j (Objective Lenses): Magnify the specimen; usually multiple with different powers.
- k (Scanning Objective Lens): Low - power objective for initial viewing.
- l (Stage Clips): Hold the slide in place on the stage.
- m (Diaphragm): Regulates the amount of light reaching the specimen.
- n (Mirror/Illuminator): Reflects (or provides) light onto the specimen.
- a (Coarse Adjustment Knob): Moves the stage or objective lens for rough focusing.
- b (Fine Adjustment Knob): Sharpens the image after coarse focusing.
- c (Arm): Supports the body tube and connects to the base.
- d (Stage): Platform where the slide is placed.
- e (Inclination Joint): Allows tilting the microscope.
- f (Base): Provides stability and support.
Question 16:
| Microscope Type | Key Differences |
|---|---|
| Dissecting microscope | Uses visible light, has lower magnification (up to ~100x), provides 3D view, used for dissecting larger specimens. |
| Transmission electron microscope (TEM) | Uses electrons, magnification up to millions of times, views thin - sectioned specimens, reveals internal cell structures. |
| Scanning electron microscope (SEM) | Uses electrons, magnification up to ~500,000x, views the surface of specimens, provides 3D surface images. |
Question 17:
| Feature | Prokaryotes | Eukaryotes |
|---|---|---|
| Contains Cytoplasm | Yes | Yes |
| Contains a Nucleus | No (nucleoid, no membrane - bound nucleus) | Yes (membrane - bound nucleus) |
| Contains Membrane - Bound Organelles | No | Yes (e.g., mitochondria, ER, Golgi) |
| Contains Ribosomes | Yes (smaller, 70S) | Yes (larger, 80S in cytoplasm, 70S in organelles) |
| Has a Cell Wall | Most (e.g., bacteria, peptidoglycan) | Some (e.g., plants, cellulose; fungi, chitin) |
| Has a Cell Membrane | Yes | Yes |
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Question 15:
- g: Ocular Lens - Magnifies image for viewing.
- h: Body Tube - Maintains lens distance.
- i: Revolving Nosepiece - Holds and switches objectives.
- j: Objective Lenses - Magnify specimen.
- k: Scanning Objective Lens - Low - power initial view.
- l: Stage Clips - Hold slide.
- m: Diaphragm - Regulates light.
- n: Mirror/Illuminator - Provides light.
- a: Coarse Adjustment Knob - Rough focus.
- b: Fine Adjustment Knob - Sharpens image.
- c: Arm - Supports and connects.
- d: Stage - Holds slide.
- e: Inclination Joint - Tilts microscope.
- f: Base - Provides stability.
Question 16:
| Compound light microscope | Dissecting microscope | Transmission electron microscope | Scanning electron microscope |
|---|
Question 17:
| Feature | Prokaryotes | Eukaryotes |
|---|---|---|
| Contains Cytoplasm | Yes | Yes |
| Contains a Nucleus | No | Yes |
| Contains Membrane - Bound Organelles | No | Yes |
| Contains Ribosomes | Yes | Yes |
| Has a Cell Wall | Most Yes | Some Yes |
| Has a Cell Membrane | Yes | Yes |