Microscopes 🔬
What do we use a microscope for?
To see very small things that cannot be seen with the naked eye.
What is a cell?
The basic unit of life.
What is a microbe?
A very small living organism that can only be seen with a microscope.
What do microbes need to grow?
Bacterial infections.
Name 2 parts of a microscope
Eyepiece, objective lens, stage, focus know, light source
Name one part of an animal cell
Nucleus, cytoplasm, cell membrane
What are the three main groups of microbes?
Bactria, viruses and fungi
What effect foes cleaning have on a microbe?
It can kill it.
Who discovered penicillin?
Alexander Flemming
What is the job of the objective lens?
It magnifies the specimen.
What state is commonly used to see animal cells and plant cells under a microscope?
Methylene blue and Iodine solution.
Where can microbes live? Name 2 places.
Name one way we control the growth of microbes.
Cleaning, disinfectants, antiseptics, sterilising
Why are antibiotics not used to treat flu?
Because flu is caused by a virus, and antibiotics do not kill viruses.What is antibiotic resistance?
If the eyepiece lens is x10 and the objective lens is x40, what is the total magnification?
x400
Which group of microbes are single-celled organisms?
Bacteria
Why is it important to grow microbes safely in a lab?
To prevent the spread of harmful microbes and contamination.
Name one way the body defends itself against microbes.
Skin. White blood cells. Mucus. Stomach Acid.
A microscope has a total magnification of ×500 and an objective lens of ×10. What is the magnification of the eyepiece lens?
×50.
Give one similarity and one difference between plant and animal cells.
Similarity: both have nucleus / cytoplasm / cell membrane. Difference: plant cells have a cell wall / chloroplasts / large vacuole.
Which group of microbes need other cells to live and reproduce?
Viruses
Name one rule used when growing microbes safely in a lab.
Do not open Petri dishes. Seal plates. Disinfect surfaces. Wash hands.
How do vaccines protect the body from diseases.
They train the immune system to recognise and fight pathogens.