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Topic 2.1

Cell Theory

Slide 1 Title Slide

Slide 2

- What are the three principles of the cell theory? (In blue and bold)- What is an example of a specialized function carried out within a multicellular organism?- Give an example of an organelle that you recall from freshman year biology. _________- What was the theory of spontaneous generation? (google it and write a 2-4 sentence describing

the theory of spontaneous generation)

- If ALL cells descend from similar common ancestors then what does that mean about life on ourplanet?

Slide 3

- List the steps of the scientific process.- Prior to its development - What was the limitation of the development of the cell theory? (Look

at the observation exampleswhat limited us before these observations?)

- Look at the hypotheses listed in black (next to the word hypothesis). Identify one of thesepotential hypotheses that have been refuted.

- Next to the evidence component of the diagram explain how you think cultural growth has aneffect on advancements in humans understanding of the universe.

- What is a required pathway toward theory development?Slide 4

- Watch the Hooke and van Leeuwenhoek video identify 5 key points from the video.ooooo

- What organism did Robert Hooke observe when he coined the term Cell?- What do you think the two root words for animalcules are?

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Slide 5

- OKput your headphones in/turn it upclick on debunking spontaneous generation it willbring you to a video about DNAclick on the closed caption button (its a cc in a little

rectangle next to the speech bubble) watch it and appreciate whatmelodysheep does for us

- Describe in 3-5 sentences how Louis Pasteur disproved spontaneous generation? Click on thePasteurs test of spontaneous generation image and read through the article for more info.

- Who plagiarized Remarks work?- What did remark prove?

Slide 6

- Do you think a virus is alive? Explain your reasoning.Slide 7

- Give a short definition and an example to for each of the 7 functions of life listed (you may usethe power of the internet)

o Nutritiono Reproductiono Growtho Movemento Response to stimulio Excretiono Homeostasis

Slide 8

- Can one of your heart cells survive outside of your body?Slide 9

- Click on the parts of the microscope picture- How do you calculate magnification?- If the eye piece is 10 and the objective is 50 what is total magnification?

Slide 10 - skip

Slide 11

- Stare/read this image for 45 secondsSlide 12

- On a sheet of paper or a post it note write down the formula for magnification and actual sizekeep these next to you.

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Slide 13

- You will be viewing images of electronmicrographs of cells and such so if you want to know theactual size of the image what are the 2 methods you may use?

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- In the example image on this slide how many mm is 20 micrometers?- Try calculating the actual size of this image on a separate sheet of paper using the formulas from

slide 12 and from the information given to you on this page.

- Check your answers try method A and method B a couple times (even if you have the answermemorized)

Slide 14

- What is the actual size of this egg cell?______________(The egg is the circle in the middle and does not include the zona pellucid.)

Slide 15 - 16

- What does the scale bar represent?- What is the first step in calculating magnification?

Slide 17

*do not print this slide (unless you want to)

- calculate the magnification of all of these scale bars:

- 2 um =- 100 nm =- 50 um =- 500 m =- 67 um =- 100 um =- 50 mm =

Slide 18 - 19

- What do you do if you are asked to calculate actual size of an image without being given a scalebar?

Slide 20

- Calculate the actual size for these electron micrographs:1) Diatom (x1,000) =2) Diatom (x5,000) =

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3) Mosquito head =4) Hypodermic needle =

Slide 21

- More practice if you need itSlide 22

- Whats the answer?

Slide 23

- Heres the answer.Slide 24

- Whats the answer?Slide 25

- Heres the answerSlide 26

- Look at the measurements of these structures- Why do you think plant cells are so much larger than the average animal cell?

Slide 27

- If you feel like messin around on the internet with some more microscopy feel free to clickaround on some of these links.