Unit 1 biology Flashcards
A eukaryotic cell is?
A cell with a nucleus
A prokaryotic cell is?
A cell with no nucleus
The first person to describe cells was?
Robert Hooke
Electron microscopes have?
A high magnification
The resolution is?
Distinguishing between 2 objects close together
Calculate the magnification if image size = 50mm and actual size = 400um
- x125
- 125x
Calculate the magnification if image size = 250mm and actual size = 100um
- x2500
- 2500x
Calculate the image size if the actual size = 25um and magnification = x400
10000um
What is the role of the Nucleolus?
Makes ribosomes
What is the role of the Lysosomes?
Breaks down waste materials
If bacteria appear pink under the microscope after gram staining, they are…?
Gram negative
Palisade mesophyll cells contain lots of?
Chloroplasts
Sperm cells have this in their head to pierce the egg cell
Acrosome
The outer protective layer of the egg cell is known as the?
Zona pelluccida
Endothelial tissue is found in the?
Blood vessels
Atheromas can be formed in?
Endothelial tissue
What is Acetylcholinesterase
A type of enzyme that breaks down neurotransmitters
What is a Eukaryotic cell?
- A multicellular organism
- It contains a nucleus
- It is found in humans and is bigger than prokaryotic cells
- It is also complex
What is a Prokaryotic cell?
- A single cell organism
- It doesn’t contain a nucleus
- It is found in animals mainly and is smaller than Eukaryotic cells
- It isn’t that complex
How can atherosclerosis develop?
Fatty deposits build up in the arteries
What are cilia
They are small hairs on the columnar epithelial tissue which sweep away dust
Name the ribosome found in bacteria?
- 70s
- 80s
How does the ultra structure of a bacterium capsule prevent dehydration?
It selectively stops water from leaving the capsule.
What damage can smoking cause
Damage to the squamous epithelial tissue
What is the function of the neutrophil cell
Immune response
What is gram staining
To identify bacteria as gram negative or positive