Cell Theory & Microscopy Quiz

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Questions and Answers

What is the original size of a fiber if its apparent size under a microscope with 400X magnification is 0.6 mm?

2.4 µm (correct)

0.15 µm

1.5 µm

240 µm

What is the FOV diameter at 400x magnification if the diameter at 40x magnification is 2.0 mm?

2.0 mm

20 mm

0.4 mm

0.2 mm (correct)

What is the estimated size of a specimen that takes up 4 of the field of view at 400x magnification with a FOV diameter of 1.7 mm?

0.425 mm (correct)

1.7 µm

0.425 µm

0.85 mm

What are the three main points of cell theory?

All living things are made of cells, cells are the structural and functional units of life, all cells arise from pre-existing cells (C) Signup and view all the answers

Why do plant cells have chloroplasts while animal cells do not?

Chloroplasts are essential for photosynthesis, which is unique to producers like plants. (C) Signup and view all the answers

What was one of the controlled variables in Pasteur’s swan neck flask experiment?

The type of broth used (B) Signup and view all the answers

What is the main function of ribosomes within a cell?

To produce proteins (C) Signup and view all the answers

What ingredient is the main reactant required for cellular respiration?

Glucose (D) Signup and view all the answers

Which of the following statements is NOT a point of the cell theory?

All cells can spontaneously generate. (C) Signup and view all the answers

What defines a controlled variable in an experiment?

The variable that remains constant throughout the experiment. (A) Signup and view all the answers

In Louis Pasteur’s experiment on spontaneous generation, what was the key element that proved his hypothesis?

Use of swan-necked flasks. (D) Signup and view all the answers

What is the function of organelles that are exclusively found in plant cells?

To conduct photosynthesis. (D) Signup and view all the answers

If a microscope has an objective lens of 10x and an ocular lens of 45x, what is the total magnification?

450x (D) Signup and view all the answers

Which of the following is NOT considered an organelle found in eukaryotic cells?

Plasmid (C) Signup and view all the answers

What formula is used to compare different magnifications in microscopy?

M1D1 = M2D2 (A) Signup and view all the answers

Which organelle is specifically absent in animal cells compared to plant cells?

Cell wall (A) Signup and view all the answers

Study Notes

Cell Theory & Microscopy

Three main points of cell theory:
- All living organisms are composed of one or more cells.
- The cell is the basic unit of structure and organization in organisms.
- All cells arise from pre-existing cells.

Microscopy Techniques

Calculating total magnification:
- Multiply the objective lens magnification by the ocular lens magnification.
Estimating specimen size:
- Use the formula: FOV diameter / # of specimen across diameter = apparent size of a single specimen
- Use the formula: M₁D₁ = M₂D₂ to find FOV at different magnifications (Where M1 and D1 are magnification and FOV at one magnification and M2 and D2 are magnification and FOV at the second magnification respectively).

Spontaneous Generation

Definition: The idea that living organisms can arise from nonliving matter.
Experiments disproving spontaneous generation:
- Francesco Redi's meat experiment: disproved spontaneous generation of maggots from meat.
- Louis Pasteur's swan-neck flask experiment: disproved spontaneous generation of microorganisms from broth.

Cell Structure and Function

Definition/function of organelles (Organelles: are specialized structures within cells that perform specific functions):
- Nucleus: Stores the genetic material (DNA).
- Chloroplast: Conducts photosynthesis in plant cells.
- Lysosome: Breaks down waste and cellular debris.
- Endoplasmic Reticulum: Synthesizes proteins and lipids.
- Plant-specific organelles: chloroplasts, cell wall (starred on diagram)
Organelles only in plants:
- chloroplasts
- cell walls

Prokaryotic vs. Eukaryotic Cells

Differences between prokaryotic and eukaryotic cells
Comparisons between prokaryotes and eukaryotes will require more than one bullet point

Cell Research Advancements

Examples of cell research advancements:
- any 3 examples of cell research from the class. Why are they considered advancements? Are there ethical implications/issues/concerns?

Importance of Cell Biology

Reason for studying cell biology:
- Importance for understanding everyday life processes.

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Description

Test your knowledge on cell theory, microscopy techniques, and the concept of spontaneous generation. This quiz covers key principles and formulas related to cells and their observation under a microscope. Dive in to assess your understanding of these fundamental biological concepts!