Microscopes and Cells Flashcards

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1
Q

Label a diagram of an optical microscope.

A

Diagram

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2
Q

Describe how you would calculate the total magnification of the low power objective lens of the microscope you are using.

A

1 - Look at the eyepiece lens to identify the magnification (this is usually 10x).
2 - Look at the low power objective lens (this is the shortest one) and identify the magnification (this is usually x4 or x5).
3 - Multiply the 2 magnifications together to get the total magnification.

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3
Q

Imagine you needed to teach a 6 year old how to focus the microscope using the medium power objective lens. Give them step-by-step instructions.

A

1 - Place the slide on the stage and secure it with the stage clips.
2 - Check the low power objective lens is engaged. It should click into place.
3 - Use the coarse adjustment to move the objective as close to the stage as it will go.
4 - Switch on the light source and, if there is a mirror, angle the mirror so the light is reflecting through the microscope.
5 - Look through the eyepiece and turn the coarse adjustment slowly until the image comes into focus.
6 - Use the fine adjustment to make the image as sharp as possible.
7 - Switch to the medium power objective lens and use ONLY the fine adjustment to bring the image into focus.

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4
Q

What are all living things made of?

A

All living things are made up of cells.

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5
Q

List the 5 parts of an animal cell that we have learned about in class.

A

Animal cells have a cell membrane, cytoplasm, nucleus, ribosomes and mitochondria. There are other parts in animal cells that you may learn about if you take A-level Biology one day!

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6
Q

Label a diagram of an animal cell.

A

Labelled

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7
Q

What is the function of the nucleus?

A

The nucleus contains DNA (deoxyribonucleic acid) and it controls all the activities of the cell.

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8
Q

What is the function of the cell membrane?

A

The cell membrane controls what enters and leaves the cell.

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9
Q

What is the function of the cytoplasm?

A

The cytoplasm is a jelly-like substance where chemical reactions take place.

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10
Q

What is the function of the mitochondria?

A

The mitochondria is the part of the cell where energy is released from food molecules.

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11
Q

What is the function of ribosomes?

A

Ribosomes make proteins.

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12
Q

Why do we stain cells?

A

To make internal structures and organelles easier to see under the microscope.

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13
Q

What are the success criteria for making a scientific drawing?

A

Success Criteria
1 - Use a sharp pencil.
2 - Lines are continuous and not sketched.
3 - Drawing is in 2 dimensions.
4 - Large - usually half a page.
5 - Magnification is included.
6 - Title included.
7 - Visible structures are labelled.

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14
Q

What structure do plant cells have that animal cells don’t have?

A

Plant cells have all the structures found in animal cells but they also have a cell wall and vacuoles. Some plant cells also have chloroplasts.

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15
Q

What is the function of the cell wall?

A

The cell wall strengthens the cell. In plant cells it is made of cellulose.

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16
Q

What is the function of the vacuole?

A

The vacuole contains liquid called cell sap and is used by plants to keep the cell rigid and to store substances.

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17
Q

What is the function of chloroplasts?

A

Chloroplasts absorb light energy so the plant can make food by photosynthesis.

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18
Q

Why are there some plant cells that do not have chloroplasts?

A

Only cells that photosynthesise have chloroplasts.

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19
Q

Draw and label a plant cell to include 8 parts and their functions.

A

Labelled

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20
Q

What are multicellular organisms?

A

Multicellular organisms are made up of many cells which work together to carry out the processes of life.

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21
Q

How are cells organised in multicellular organisms?

A

Cells are organised into tissues.

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22
Q

What is a tissue?

A

Tissues are groups of cells of one type organised together.

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23
Q

Give examples of tissues found in the human body.

A

Tissues in the human body include skin tissue, muscle tissue, and nervous tissue.

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24
Q

What are tissues organised into?

A

Tissues are organised into organs.

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25
Q

What is an organ?

A

Organs are made up of groups of different tissues working together to carry out a job.

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26
Q

What are organs part of?

A

Organs are part of systems.

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27
Q

Draw a diagram starting with a single cell to show the levels of organisation in the human body.

A

Levels of Organisation

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28
Q

How are single celled organisms able to carry out all the processes of life?

A

Single celled organisms are specially adapted to be able to carry out all the processes of life.

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29
Q

How are multicellular organisms adapted to carry out all the processes of life.

A

Multicellular organisms have specialised cells that can work together in tissues, organs and systems to carry out all the processes of life.

30
Q

How are muscle cells specialised to carry out their function?

A

Muscle cells are able to contract. This causes them to shorten and allows movement to take place. They also have many mitochondria to release the energy needed for contraction.

31
Q

How are root hair cells specialised to carry out their function?

A

Root hair cells have a very large surface area which allows them to absorb water from the soil quickly.

32
Q

How are ciliated epithelial cells specialised to carry out their function?

A

The function of ciliated epithelial cells is to keep the airways clean by helping to move mucus up towards the mouth. The cilia sweep the mucus containing dirt and bacteria up and into the mouth.

33
Q

How are sperm cells specialised to carry out their function?

A

The function of sperm cells is to travel towards an egg cell for fertilisation to take place. The long tail allows the sperm to swim to the egg.

34
Q

How are nerve (neuron) cells specialised to carry out their function?

A

The function of this cell is to carry messages around the body.
It is long and is able to connect to many other cells so messages can travel quickly.

35
Q

What is the skeletal system made up of?

A

The skeletal system is composed of the bones, cartilage, ligaments and tendons.

36
Q

Label the diagram of the skeleton.

A

Labelled Skeleton

37
Q

What are the 4 main functions of the skeleton?

A

The skeleton:
1 - Provides support.
2 - Provides protection for organs.
3 - Allows movement.
4 - Produces blood cells.

38
Q

What makes bones move?

A

Muscles need to contract to make bones move.

39
Q

How are muscles attached to bones?

A

Tendons attach muscles to bones.

40
Q

What feature of tendons makes them good at transferring the contraction of muscles into bone movement?

A

Tendons are inelastic. This means that all the force from contracting muscles can be transferred to bones.

41
Q

What does antagonistic mean?

A

Antagonistic means ‘showing opposition”.

42
Q

Why do muscles work in antagonistic pairs?

A

One muscle contracts to move the bone. The other muscle acts to return the bone to the original position.

43
Q

Describe the stages in bending and extending your arm. Use the names of the muscles in your description.

A

1 - The biceps muscle contracts and the triceps muscle relaxes causing the arm to bend.
2 - The triceps muscle contracts and the biceps muscle relaxes causing the arm to extend.

44
Q

What is the role of joints?

A

Joints hold bones together and allow movement to take place.

45
Q

What are the 2 main types of joints?

A

1 - Hinge joint
2 - Ball and socket joint

46
Q

What range of movement does a hinge joint allow?

A

Hinge joints allow movement in one plane.

47
Q

What range of movement does a ball and socket joint allow?

A

Ball and socket joints allow movement in all directions.

48
Q

What is the role of ligaments?

A

Ligaments connect bones together at a joint. They stabilise a joint.

49
Q

What is the role of cartilage?

A

Cartilage acts as a shock absorber in joints while also reducing friction allowing bones to move over each other smoothly.

50
Q

What is the role of synovial fluid?

A

Synovial fluid is an oily liquid which reduces friction at a joint.

51
Q

Label a diagram of a joint.

A

Labelled Joint

52
Q

What is the function of the respiratory system?

A

The role of the respiratory system is to allow gas exchange to take place. Oxygen moves into the blood and carbon dioxide moves out of the blood.

53
Q

Label a diagram of the respiratory system.

A

Labelled Respiratory System

54
Q

What is the function of the trachea?

A

The trachea is the windpipe that stays open to allow air to reach the lungs.

55
Q

What are bronchi?

A

Bronchi are pipes that allow air to enter each lung.

56
Q

What are bronchioles?

A

Bronchioles are small pipes that lead to the air sacs.

57
Q

What is an air sac?

A

Air sacs are tiny structures where gas exchange takes place.

58
Q

What is the function of the ribs?

A

The ribs protect the heart and lungs but also allow breathing.

59
Q

What is the role of the intercostal muscles?

A

Intercostal muscles contract to move the ribs and allow breathing.

60
Q

What is the diaphragm?

A

The diaphragm is a flat muscle that contracts to allow breathing.

61
Q

Describe what your muscles need to do when you breathe in.

A

To breathe in, the intercostal muscles contract causing the ribs to move up and out and the diaphragm contracts and moves down.

62
Q

Describe what your muscles need to do when you breathe out.

A

To breath out, the intercostal muscles relax and the ribs move down and in. The diaphragm relaxes and moves up.

63
Q

What is a variable?

A

A variable is a factor that can be changed, measured or controlled.

64
Q

What is the independent variable?

A

The independent variable is the factor you change in an investigation to see how it affects the dependent variable.
Example: If the aim is “To see how changing the level of exercise affects breathing rate” then the independent variable is level of exercise.

65
Q

What is the dependent variable?

A

The dependent variable is the factor that is measured or observed in an investigation.
Example: If the aim is “To see how changing the level of exercise affects breathing rate” then the dependent variable is breathing rate.

66
Q

What are control variables?

A

Control variables are all the factors that need to be kept the same to make our investigation fair (valid). Only the independent variable can be changed.
Example: If the aim is “To see how changing the level of exercise affects breathing rate” then control variables include the person used in the investigation, the time spent exercising and the type of exercise.

67
Q

What format do investigative aims take?

A

Aim: To see how changing ________ affects ___________.

68
Q

What is a hypothesis?

A

A hypothesis is a prediction with a reason.

69
Q

What type of data would you graph using a bar chart.

A

Discontinuous data is graphed using a bar chart. This is data that can be divided into categories. Example: leaf shape, eye colour, level of exercise.

70
Q

What are the success criteria for producing a bar chart.

A

1 - Use a sharp pencil and a ruler.
2 - Label the X axis with the independent variable.
3 - Label the Y axis with the dependent varival. Include units.
4 - Add labels to the X axis.
5 - Add a scale to the Y axis. The scale must go up evenly.
6 - Plot data and draw a line using a ruler across the top of the bar. This line must be accurately placed using the scale.
7 - Bars need to be the same width and have space between them.

71
Q

What are the 2 requirements for a conclusion?

A

1 - The conclusion relates back to the aim.
2 - The data supports the conclusion.