Biology Cell Width Calculation Quiz

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Questions and Answers

Which of the following laboratory equipment could the student have used to prepare cells for microscope observation?

Spatula and test tube

Centrifuge and pipette (correct)

Thermometer and pH meter

Bunsen burner and beaker

What is the function of part B in the student's light microscope?

To magnify the specimen

To rotate the objective lens

To focus the image

To illuminate the specimen (correct)

Why could the student not see any cells when looking through part A of the microscope?

The light source was not turned on

The objective lens was not focused correctly

The stage was not adjusted properly

The specimen was not properly prepared (correct)

Which of the following is a key difference in the structure between a red blood cell and a plant cell?

Plant cells have a defined nucleus, red blood cells do not Signup and view all the answers

What is the primary function of the cell wall in a plant cell?

To provide structural support and protection Signup and view all the answers

Why are red blood cells typically a red or reddish-orange color?

They have a high concentration of hemoglobin Signup and view all the answers

Which of the following is a key difference between plant and animal cells?

Plant cells have a cell wall, while animal cells do not Signup and view all the answers

What is the primary function of the cell wall in plant cells?

To protect the cell from mechanical stress and maintain its shape Signup and view all the answers

If a microscope has a magnification of 400x and the observed width of a cell is 2 cm, what is the actual width of the cell in micrometers (µm)?

50 µm Signup and view all the answers

If a bacterial cell has a diameter of 0.2 µm, and a red blood cell has a diameter of 8 µm, how many times larger is the red blood cell compared to the bacterial cell?

Which of the following structures are found in plant cells but not in animal cells?

Cell wall and chloroplasts Signup and view all the answers

What is the primary function of chloroplasts in plant cells?

To carry out the process of photosynthesis Signup and view all the answers

Which structure is primarily responsible for providing structural support and protection to the plant cell?

Cell wall Signup and view all the answers

Based on the graph, what occurs to the number of live cells after 20 hours?

It drops sharply Signup and view all the answers

Which of the following is a likely reason for the decrease in live cells after 20 hours?

All of the above Signup and view all the answers

Which type of microscope was most likely used to create the image of the cress root?

Light microscope Signup and view all the answers

Which of the following sub-cellular structures is primarily responsible for containing the genetic material in plant cells?

Nucleus Signup and view all the answers

What is the purpose of the coloration observed in plant cells?

It facilitates photosynthesis Signup and view all the answers

Study Notes

Laboratory Equipment and Microscopy

The student could have used a microscope, prepared slides, and a centrifuge to prepare cells for microscope observation.
Part B in the student's light microscope is the objective lens, which focuses the light onto the sample.
The student could not see any cells when looking through part A (the eyepiece lens) because the microscope was not focused or the sample was not properly prepared.

Cell Structure and Function

A key difference between red blood cells and plant cells is the presence of a cell wall in plant cells.
The primary function of the cell wall in plant cells is to provide structural support and protection.
Red blood cells are typically red or reddish-orange in color due to the presence of hemoglobin.
A key difference between plant and animal cells is the presence of a cell wall in plant cells.

Microscopy and Measurement

If a microscope has a magnification of 400x and the observed width of a cell is 2 cm, the actual width of the cell is 2 cm / 400 = 0.005 cm = 50 µm.
If a bacterial cell has a diameter of 0.2 µm and a red blood cell has a diameter of 8 µm, the red blood cell is 8 µm / 0.2 µm = 40 times larger than the bacterial cell.

Plant Cell Structure and Function

Structures found in plant cells but not in animal cells include chloroplasts and a cell wall.
The primary function of chloroplasts is to contain the genetic material and perform photosynthesis.
The cell wall is primarily responsible for providing structural support and protection to the plant cell.

Cell Growth and Death

According to the graph, the number of live cells decreases after 20 hours.
A likely reason for the decrease in live cells after 20 hours is cell death or apoptosis.

Microscopy and Imaging

The type of microscope most likely used to create the image of the cress root is a light microscope or a compound microscope.
The nucleus is the sub-cellular structure primarily responsible for containing the genetic material in plant cells.
The purpose of the coloration observed in plant cells is likely to highlight the presence of chloroplasts or other organelles.

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Description

This quiz involves calculating the width of a cheek cell in micrometres. It includes steps to measure the width of the cell, use an equation to determine the real size, and convert mm to µm. Additionally, it requires calculating the diameter of a bacterial cell based on the size of a red blood cell.