Q: A student takes a photograph of a cell that is 10 micrometers ($$10\ \mu m) $$long. In the photograph, the cell measures 10 centimeters ($$10\ \text{cm}). $$What is the magnification of the photograph?

$$\frac{10\ \text{cm}}{0.001\ \text{cm}} = 10,000X$$

Question 1

Which of the following best describes the main difference between fundamental research and applied research?

Accepted Answer

Fundamental research aims to expand scientific knowledge, while applied research focuses on solving real-life problems using that knowledge.

Question 2

A scientist observes a new microorganism under a microscope and wants to determine its structure. Which type of microscope would provide the highest resolution for viewing the internal structures of this microorganism?

Accepted Answer

Transmission electron microscope (TEM)

Question 3

If a microscope has an objective lens with 40X magnification and an ocular lens with 10X magnification, what is the total magnification?

Accepted Answer

$$40 	imes 10 = 400$$

Question 4

Which of the following best explains why oil is used with the oil immersion lens in light microscopy?

Accepted Answer

Oil reduces light refraction and increases the amount of light entering the lens, improving resolution.

Question 5

A student takes a photograph of a cell that is 10 micrometers ($$10\ \mu m) $$long. In the photograph, the cell measures 10 centimeters ($$10\ 	ext{cm}). $$What is the magnification of the photograph?

Accepted Answer

$$\frac{10\ 	ext{cm}}{0.001\ 	ext{cm}} = 10,000X$$

Question 6

Which of the following is NOT considered scientific evidence according to the hierarchy of scientific evidence?

Accepted Answer

Personal anecdotes and gut feelings

Question 7

Why does a specimen appear upside down and reversed when viewed through a compound light microscope?

Accepted Answer

The objective lens and ocular lens together produce an inverted and reversed virtual image.

Question 8

Which microscope would be most appropriate for observing live, unstained cells to study their internal structures at high resolution?

Accepted Answer

Phase-contrast microscope

Question 9

A researcher wants to visualize the three-dimensional surface of a pollen grain. Which microscope should they use?

Accepted Answer

Scanning electron microscope (SEM)

Question 10

Which of the following statements about numerical aperture (NA) is correct?

Accepted Answer

A larger NA collects more light and generally provides better resolution.

Question 11

Which step in the scientific method comes immediately after forming a hypothesis?

Accepted Answer

Make a prediction based on the hypothesis

Question 12

A scientist is using a fluorescence microscope. What is the main advantage of this type of microscope?

Accepted Answer

It uses ultraviolet light to excite dyes that emit visible light, allowing specific structures to be visualized.

Question 13

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

Accepted Answer

Electron beams have much shorter wavelengths than visible light.

Question 14

A researcher wants to reconstruct a three-dimensional image of a thick biological specimen. Which microscope technique should they use?

Accepted Answer

Confocal microscopy

Question 15

Which of the following is a key reason for using a blue filter disk in light microscopy?

Accepted Answer

Blue light has a shorter wavelength, which increases resolution.

Question 16

A student is carrying a compound microscope to their lab bench. Which is the correct way to carry it?

Accepted Answer

With one hand on the arm and one hand under the base

Question 17

Which of the following best describes the relationship between magnification and resolution in microscopy?

Accepted Answer

Magnification without sufficient resolution results in a blurry image.

Question 18

Which of the following is a correct sequence of steps in the scientific method?

Accepted Answer

Make an observation → Ask a question → Form a hypothesis → Make a prediction → Do an experiment → Analyze results

Question 19

Which of the following best describes the function of the condenser lens in a compound microscope?

Accepted Answer

It focuses light onto the specimen to improve illumination.

Question 20

A scientist is using a polarizing microscope to examine a biological sample. What is the main advantage of this technique?

Accepted Answer

It allows visualization of birefringent structures by using polarized light.

L 1.2: Introduction to Scientific Inquiry and Microscopy in Biology

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