Cells Flashcards
(25 cards)
What are the different parts of a microscope?
Eyepiece lens, body tube, nosepiece, objective lens, stage clips, stage, condenser, illuminator, base, fine focus, coarse focus and the arm.
What do people use microscopes for?
To look at small organisms like cells that can’t be seen with the naked eye.
What is a cell?
The smallest living unit that can live on its own and makes up all living things and tissues of the body.
What are the 2 types of cells?
Animal and plant cells.
What are features that both an animal and plant cell have?
A nucleus, cell membrane, cytoplasm and mitochondria.
What are features that only a plant cell has?
A cell wall, vacuole and chloroplasts.
What is the function of mitochondria?
It is where aerobic respiration takes place and helps to release energy for the cell.
What is aerobic respiration?
Respiration that uses oxygen and glucose to react and produce carbon dioxide and water. This reaction produces lots of energy.
What is the function of a chloroplast?
To make food for the plant via photosynthesis.
What do chloroplasts contain?
Chlorophyll
What usually occurs in the cytoplasm?
Chemical reactions
What is special about the cell membrane?
It is semi-permeable meaning it allows some things to go in and some to go out.
What does it mean if something is unicellular?
It is made up of only one cell.
Euglena is a unicellular organism. Give one adaptation it has to survive in its environment.
As euglena live in water, they have a tail-like structure called a flagellum to help them swim.
Amoeba is a unicellular organism. Give one adaptation it has to survive in its environment.
As some amoeba also live in water, they use a contractile vacuole to collect any excess water inside them and squeeze it out at the cell membrane.
Fill in the missing gaps. Cell,____, Organ,__________ and Organism.
Tissue, Organ System
What 2 things do cells need to survive?
Glucose and oxygen.
Materials move in and out of cells by a process called diffusion. Explain what this process means.
Diffusion is when a substance moves from an area of high concentration (where there’s lots of it) to an area of low concentration (where there’s less of it).
Give one waste product that cells need to get rid of.
Carbon dioxide
What is anaerobic respiration?
Respiration that takes place without oxygen and is different in different organisms.
What are the 7 signs of life (MRS GREN)?
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition.
Sam has bought a toy robot and says that it isn’t a living organism because it can’t grow. Lily says it is because it can move. Explain who you think is correct and why.
Sam is correct because although a robot can move, it lacks other characteristics of life and these are all things that living organisms are able to do.
A student wanted to see the cells he had prepared. Describe what the student should do with the slides and the microscope in order to see the cells more clearly.
They should use the stage clips to keep the slide in place to prevent it from moving. Also, they could use the coarse and then fine focusing wheel to increase the vision of the cell. Finally, they should start on low power.
Dylan is using a microscope. Calculate the total magnification when using an eye piece magnification of x10, and he uses an objective lens of x40.
40 x 10=400
Total magnification = x400
