Question 1

Which of the following statements is NOT part of the classical Cell Theory as proposed by Schwann and Virchow?

Accepted Answer

All cells contain a nucleus.

Question 2

A scientist is using a light microscope to observe a specimen. The shortest distance between two points that can still be distinguished is 0.2 microns. What is the theoretical limit of resolution for this microscope, given the wavelength of light used is $$\lambda = 0.4\ \mu m$$?

Accepted Answer

$$0.2\ \mu m$$

Question 3

Which of the following cell types would be best visualized using a transmission electron microscope (TEM) rather than a light microscope?

Accepted Answer

Ribosomes

Question 4

A student observes a cell with no membrane-bound organelles and no nuclear envelope. Which type of cell is being observed?

Accepted Answer

Bacterial cell

Question 5

Which of the following features is unique to plant cells and not found in animal cells?

Accepted Answer

Chloroplasts

Question 6

If the resolution of a light microscope is $$0.2\ \mu m$$ and the resolution of a transmission electron microscope is $$0.2\ nm$$, how many times greater is the resolving power of the TEM compared to the light microscope?

Accepted Answer

$$1000$$ times greater

Question 7

Which of the following is a limitation of light microscopy?

Accepted Answer

Resolution is limited to about $$0.2\ \mu m$$

Question 8

A researcher wants to observe the surface structure of a pollen grain at very high resolution. Which microscopy technique should be used?

Accepted Answer

Scanning electron microscopy (SEM)

Question 9

Which of the following correctly matches the SI prefix with its meaning?

Accepted Answer

Nano (n): $$10^{-9}$$

Question 10

A cell is observed to have a large central vacuole, a cell wall, and chloroplasts. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 11

Which of the following is a correct application of the cell theory to a real-world scenario?

Accepted Answer

A cut on your skin heals because new cells arise from the division of preexisting skin cells.

Question 12

Which of the following is NOT a difference between plant and animal cells?

Accepted Answer

Both have mitochondria.

Question 13

A scientist wants to visualize the location of a specific protein within a living cell. Which microscopy technique would be most appropriate?

Accepted Answer

Fluorescence microscopy

Question 14

Which of the following best explains why electron microscopes have a higher resolving power than light microscopes?

Accepted Answer

Electrons have a much shorter wavelength than visible light.

Question 15

A cell is observed to have small vacuoles, centrioles, and lysosomes. Which type of cell is this most likely to be?

Accepted Answer

Animal cell

Question 16

Which of the following units would be most appropriate to measure the diameter of a typical bacterial cell?

Accepted Answer

Micrometers ($$\mu m)$$

Question 17

Which of the following is a correct sequence of steps in the scientific method as applied to cell biology research?

Accepted Answer

Make observations → Formulate hypothesis → Design experiment → Collect data → Interpret results → Accept or reject hypothesis

Question 18

Which of the following structures is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Plasma membrane

Question 19

A researcher stains a cell sample and observes it under a microscope. The cell has a fixed, rectangular shape, a large central vacuole, and no centrioles. Which type of cell is this?

Accepted Answer

Plant cell

Question 20

Which of the following best describes the main advantage of confocal microscopy over traditional fluorescence microscopy?

Accepted Answer

Confocal microscopy eliminates out-of-focus light, producing sharper images.

Introduction to Cell and Molecular Biology: Cell Theory, Microscopy, and Cell Types

Guida di studio - Domande di pratica

Study guide - Flashcard