Cells and transport Flashcards
How do you calculate total magnification
Eyepiece lens x objective lens
Define the term resolution
Resolution is the ability to distinguish between two separate points in an image
What is the role of the nucleus
Contains DNA in the form of chromosomes. Contains the genetic code.
What is the role cytoplasm in a cells
This is where chemcial reactions take place
What is the function of the cell membrane
Controls what enters and leaves the cells.
What is function of the mitochondria is cellsw
This is the site of respiration.
Glucose + Oxyen –> Carbon dioxide + water vapour + ATP energy
Define the word ‘magnification’
Magnification is how much bigger an image is compared to it’s actual size.
Can be calculated by using the IAM triange.
Function of the cellulose cell wall
This is outer layer of plant cells. It is made of cellulose. It gives the plant strength and support.
Why are ribosomes needed in a cell?
Ribosomes are the site (location) where proteins are made.
What is the function of chloroplasts in plant cells?
Chloroplasts contain a green chemcial called chlorophyll. It traps sunlight energy which is needed for photosynthesis.
What is the role of a vacuole in a plant cell
enclosed compartments that are filled with both inorganic and organic molecules, along with water to support the organelle.
What are eukaryotic cells?
A eukaryote is any organism whose cells have a cell nucleus and other organelles enclosed within membranes.
What is a prokaryotic cell?
Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures, they do not have a nucleus, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.
What is a plasmid?
a genetic structure in a cell that can replicate independently of the chromosomes
What is order of magnitude?
An estimate of size or magnitude expressed as a power of ten
What is it called when a plant cell is put in a dilute solution?
It will fill up the cell by osmosis but the cell will not burst as it has a cell wall. This is called turgid
What happens when an animal cell is put in a concentrated solution?
The water in the cell will leave by osmosis causing the sell to wrinkle the cell is crenated
What is the role of a vacuole in a plant cell
enclosed compartments that are filled with both inorganic and organic molecules, along with water to support the organelle.
What are eukaryotic cells?
A eukaryote is any organism whose cells have a cell nucleus and other organelles enclosed within membranes.
What is meant by flaccid?
This is when a cell is a neutral solution and it is normal
What is a plasmid?
a genetic structure in a cell that can replicate independently of the chromosomes
What is order of magnitude?
An estimate of size or magnitude expressed as a power of ten
What is meant by the term plasmolyzed?
This is when a plant cell is in a concentrated solution. Because of this water leaves the cell by osmosis and the cell becomes wrinkled
What is osmosis?
Osmosis is the movement of water molecules from an area of low concentration to an area of low concentration through a partially permeable membrane
What is diffusion?
Diffusion is the movement of particles from an area of high concentration to a low concentration
What is a dilute solution?
A dilute solution is when water is added
