Edexcel 9-1 GCSE Biology Topic 1 Cells
Microscopes and Enzymes
eyepiece lens - correct answer The part of the microscope you look down.
magnification - correct answer How much bigger something appears
compared with its actual size.
objective lens - correct answer The part of the microscope that is closest to
the specimen.
resolution - correct answer Smallest change that can be measured by an
instrument. For example, in a microscope it is the smallest distance between two points that can be
seen as two points and not blurred into one point.
stain - correct answer A dye used to colour parts of a cell to make them easier
to see.
aerobic respiration - correct answer A type of respiration in which oxygen is
used to release energy from substances, such as glucose.
cell (surface) membrane - correct answer The membrane that controls what
goes into and out of a cell. It is often called the cell surface membrane because eukaryotic cells contain
other structures with membranes.
cell sap - correct answer Liquid found in the permanent vacuole in a plant cell.
cell wall - correct answer A tough layer of material around some cells, which is
used for protection and support. It is stiff and made of cellulose in plant cells. Bacteria have a flexible
cell wall.
