Biology Cell Width Calculation Quiz

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.

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.