Cells P1

What does the Turret do?

Rotates to bring the objectives lenses into place

Name some specialised cells

Sperm, Nerve cells

What is the function of Sperm?

To get the male DNA to the Female DNA

What is the adaption of sperm

Streamlined Head, long tail, lots if mitochondria to provide energy

What is the adaption of nerve cells?

Long to cover more distance

What are infectious diseases caused by?

Micro-organisms

What is the equation of total magnification used?

Total Magnification Used = Eyepiece magnification x Objective lens magnification

How do you calculate magnification?

Size of image / Size of real object

What is the stage

Where the microscope slide is placed

Label this diagram

Label this diagram

What is magnification?

The number of times larger an image appears compared to the actual size.

Which lenses are the magnified image produced by?

The eyepiece lens and the objective lens

What is resolution?

The ability to distinguish 2 seperate points as distinct from eachother

Which beam and is the wavelength longer or shorter than an electron microscope in a light microscope

It has beams of light, and its wavelength is longer

Which microscope requires training?

Electron microscope

Which microscope shows colour?

Light microscope

Which microscope has a greater resolution and magnification

An electron microscope

What is an eukaryote

Any organism consisting of one or more cells that contain DNA in a membrane-bound nucleus, separate from the cytoplasm

Which cells contain a large number of organelles?

Eukaryotic cells

How do humans grow bigger?

By cells dividing

Which organelles are found in the animal cells?

Nucleus, cell membrane, cytoplasm, mitochondria, and ribosomes

What are the organelles in plant cells

Nucleus, cell membrane, cytoplasm, mitochondria, ribosomes, chloroplasts, vacuole, cell wall

What is the function of the cell membrane?

Controls what moves in and out of the cell

What is the function of the cytoplasm?

A liquid gel where many chemical reactions take place

What is the function of ribosomesV?

Its a structure where proteins are made

What is the function of chloroplasts?

Absorb light for photosynthesis

What is the function of the cell wall?

Supports the plant cell. Made of a chemical called cellulose which gives the cell strength

What is the function of the vacuole?

A bag of liquid in the plant cell. Important to keep cells rigid to give support. Contains cell sap

Which factors speed up the rate of diffusion?

Larger concentration gradient, high temperature, larger particles and larger surface area

Bigger concentration gradient = ___ rate of diffusion

Faster

How is a nerve cell adapted to its function?

Covered in fat to increase the speed of nerve impulses, branched to connect to other cells, very long to carry impulses a long way

Why is osmosis passive?

It requires no energy

What does partially-permeable membrane mean?

Selective - only lets certain particles past

What moves into plants roots?

Minerals, water and nutrients

How does water move into the root hair cell?

Osmosis

How do mineral ions move into the root hair cell?

Active transportation

What are examples of active transportation?

Glucose absorbed from the intestine into the blood, plants moving mineral ions for a healthy growth

What is the meristem?

The region at tips of roots and shoots where cell division happens

What are the 3 stages of the cell cycle?

Replication, mitosis, and division