AQA Biology GCSE - Cell Structure Quiz

Cell Structure and Microscopy

• Cells can be kept in a culture solution for 25 hours and the number of live cells can be monitored over time.
• The number of live cells increases during the first 20 hours, then decreases after 20 hours.
• One reason for the decrease in live cells after 20 hours could be a lack of nutrients or accumulation of waste products.

Microscope Use

• A student prepared animal cells to view using a microscope and used a microscope with a light source.
• The student used a light microscope to view the cells.
• Part A of the microscope is the eyepiece lens.
• Part B of the microscope is the condenser lens, which focuses light onto the specimen.
• If the student could not see any cells when looking through part A, it may be because the microscope was not focused correctly.

Cell Measurement

• The width of a cell can be measured using a ruler and a microscope.
• The real width of a cell can be calculated using the equation: real size mm = measured width mm / magnification.
• The width of a cheek cell can be calculated in micrometres (µm) by converting the measured width from mm to µm.

Cell Comparison

• Red blood cells are specialized animal cells that have a unique structure compared to plant cells.
• A red blood cell is 8 µm in diameter, while a bacterial cell is 40 times smaller, with a diameter of 0.2 µm.

Cell Parts and Functions

• Animal and plant cells have several parts, each with a different function.
• Cell parts include the nucleus, cytoplasm, cell membrane, and mitochondria, among others.
• The nucleus contains genetic material, the cytoplasm is the jelly-like substance inside the cell membrane, and mitochondria produce energy for the cell.
• Plant cells have additional parts, including a cell wall and chloroplasts, which are not found in animal cells.