Which plant cells can open and close to allow gas exchange and control water loss?
The guard cells
A student leaves a piece of potato in 0.2 mol dm-3 concentration of sugar solution. Explain why the potato increases in mass!
Water moves into the potato cells via osmosis, so the potato gains mass.
What is the function of the cytoplasm in this animal cell?
Where most of the chemical reactions needed for life take place.
The synapse pass chemical signals between cells. [True / False]
True
What is the function of the mitochondria in this animal cell?
Where aerobic respiration takes place.
Which is larger, a bacteria (prokaryotic) cell or a virus?
Bacteria
In prokaryotic cells the genetic material is not enclosed in a nucleus. [True / False]
True
What is the function of the ribosomes in this animal cell?
Where protein synthesis (making) takes place.
What is the function of the Cell membrane in this animal cell?
Controls the passage of substances such as glucose into the cell and hormones out of the cell.
What is the function of the nucleus in this animal cell?
Controls the activities of the cell and contains the DNA.
Which specialised animal cells have a large surface area, haemoglobin and no nucleus?
Red blood cell
Which specialised animal cells have many mitochondria to provide energy for the cell to contract?
A muscle cell
What type of cell is this?
A nerve cell
How do you calculate the magnification of an image?
Magnification = size of image / size of real object
This image of Chromosomes during cell division has a magnification of x4500. A light microscope was used to create this image. [True/False]
False. This power of magnification is achieved using an electron microscope.
Eukaryotic cells have genetic material enclosed in a nucleus. [True / False]
True
Chemical signals travel down the axon of this cell. [True / False]
False - electrical signals travel down the axon
What is the function of the chloroplasts in this plant cell?
Contains the chlorophyll, where photosynthesis takes place
Which specialised animal cell has enzymes to digest cell membrane in its tip and a tail for swimming?
A sperm cell
What is the function of the vacuole in the plant cell?
Filled with cell sap, keeps the cell rigid to support the plant
What is it called when cells divide to produce two identical daughter cells.
Mitosis
Bacteria are an example of Prokaryotes cells. [True / False]
True
What is the name of the "tail" that some bacteria have?
Flagella
What is the missing label from this diagram of a microscope?
Objective lens