Cells Flashcards
What is a cell?
A cell in the smallest working unit of a living thing (organism)
What are the characteristics of living things ?
Movement , reproduction , sensitivity , feeding , excretion , respiration and growth
What is a rough estimation of how many cells are in living thing?
Billions of cells
What object is needed to see a cell?
A microscope
Who was the first person to use a microscope to see a cell?
Robert Hooke
What are the different types of cells ?
Blood cells , skin cells , animal cell , nerve cells and sperm cells
Who has cells?
All living things
What does unicellular mean ?
Made up of just one cell eg.Bacteria
What is a multicellular ?
Made up of many cells , eg.Human
What is the function of the eyepiece ? (microscope)
The eyepiece is used to magnify and view the specimen.
What are the parts of a microscope ?
Eyepiece , course focus wheel , fine focus wheel , stage , objective lens , light and nosepiece
What is the function of the course focus wheel ? (Microscope)
It is used to focus the specimen roughly
What is the function of the fine focus wheel ? (Microscope)
It is used to fine-tune the image of the specimen
What is the function of the stage ? (Microscope)
It is used to hold the specimen (glass slide)
What is the function of the objective lens? (Microscope)
Is is used to magnify the specimen
What is the function of the light ? (Microscope)
It’s is used to see the specimen
What is the function of the nosepiece ? (Microscope)
It allows use of different lenses
What are the parts of the animal cell?
Ribosome , cell membrane , nucleus , cytoplasm and mitochondria
What is the function of the cell membrane?
It’s is mostly made up of fat , it protects the cell and allows substances in and out of the cell
What is the function of the nucleus?
It carries genes , which control the activities of the cell
What is the function of te cytoplasm?
It is a watery fluid of salts and food in which cells float
What is the function of the mitochondria?
Where the energy is released from food in respiration
What is the function of the ribosome ?
It makes proteins ie)hormones and enzymes
What equipment do u need for the cheek cell experiment ?
Microscope , cheek cells , cotton bud , methylene blue , slide and cover slip
What is the method of the cheek cell experiment?
First you gently scrape the inside of your cheek with a cotton bud. Then rub the stick gently across the clean glass slide , let is dry onto the slide. Then add on drop of methylene blue stain on the cheek cells. Tilt the slide so that the stain covers the cheek cells. Lastly , place a cover onto the slide at a 45 degrees and lower it gently to avoid air bubbles
How do u calculate the magnification caused by a light microscope?
You multiple the eyepiece magnification by the objective lens magnification.
