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Biology > Biology Lab 3 > Flashcards

Biology Lab 3 Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

What part of the microscope helps you focus the oculars?

A

Ocular adjustment.

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2
Q

What part of the microscope do you put the slide sample on?

A

Stage

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3
Q

What part of the microscope holds up the oculars?

A

Arm

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4
Q

Name two types of adjustment on the lower portion of a microscope.

A

Coarse adjustment and fine adjustment.

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5
Q

How do you turn on the light on a microscope?

A

Light switch

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6
Q

What part of a microscope do the iris and stage sit on?

A

Base

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7
Q

What part of of the microscope do you use to turn the objective lens?

A

Revolving nosepiece

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8
Q

Objective lens

A

?

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9
Q

Which objective lens is the shortest?

A

The scanning objective.

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10
Q

Which adjustment knob is larger? The coarse adjustment or the fine adjustment?

A

The coarse adjustment

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11
Q

Which knob do you use to bring an image into sharper focus?

A

The fine adjustment knob.

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12
Q

Which adjustment knob should you never turn more than to complete turns?

A

The fine adjustment knob.

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13
Q

What part of a microscope do you use to reposition a slide under the objectives?

A

The stage controls (left/right; front/back).

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14
Q

The pointer (a black line) in one of the ocular’s is what?

A

A very tiny wire.

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15
Q

If a slide moves to the right, does the image move to the right or to the left?

A

To the left.

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16
Q

If an image moves to the right does the image appear the same as the actual, or is it reversed from left to right?

A

It is reversed and upside down.

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17
Q

What number is on the low power objective?

A

10 X

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18
Q

Why should you never use the course focus knob with the low power or high-power objective lenses?

A

It could break the slide.

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19
Q

What number is on the high power objective?

A

40 X

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20
Q

What is the 100 X objective (The one with the black line painted around The edge) used for?

A

It is the oil – immersion lens for viewing bacteria etc.

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21
Q

What is the total magnification using the high-power lens?

A

400 X

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22
Q

What is the total magnification using the low power lens?

A

100 X

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23
Q

Which slide would you use to practice depth of field viewing?

A

Silk threads slide

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24
Q

With which objective lens are all the threads in focus at once?

A

The scanning objective lens.

25
Q

Which objective lens has the greatest depth of field?

A

10 X

26
Q

What is another name for the Elodea plant?

A

Anachris.

27
Q

What do air bubbles look like on a wet mount slide?

A

Round with thick dark edges.

28
Q

How should you hold the coverslip when making a wet mount slide to avoid air bubbles?

A

At an angle.

29
Q

When using a scanning lens, how do the cells of the Elodea leaf appear?

A

Rectanglular.

30
Q

What are the numerous green structures inside the Elodea leaf?

A

Chloroplasts.

31
Q

As the light warms a slide what do the chloroplasts appear to do?

A

They appear to circle around the central vacuole (the nucleus may or may not be easily visible). This is called cyclosis.

32
Q

Why did you use Lugol’s Iodine (IKI), instead of water, on the onion epidermal cells?

A

To make the onion cells more visible.

33
Q

Why do the Elodea cells have chloroplasts while the onion epidermal cells do not?

A

Because the Elodea are leaves. Leaves use chlorophyll, which they store in chloroplasts, to make food for plants.

34
Q

What is found inside the nucleus of a cell?

A

Chromosomes

35
Q

Where could you find human epithelial cells in your classroom?

A

Inside of your cheek.

36
Q

What organelle is most prominent in human cheek cells?

A

Nucleus

37
Q

How do human cells contrast with onion cells in shape?

A
  1. Human cells are smaller and more round. 2. Onion cells are more elongated and rectangular oval-ish
38
Q

Why can you not see any sells when you look at your skin?

A

Because your cells are too small to be seen with the human eye.

39
Q

What are parenchyma cells?

A

Unspecialized, mature plant cells with thin cell walls.

40
Q

What is one thing that parenchyma cells do?

A

Store starch and water.

41
Q

What do starch granules look like when prepared with Lugol’s Iodine?

A

Purple – black bodies on the slide

42
Q

What might be present in a slide containing Pondwater or pond scum?

A

Algae, diatoms, protozoans, and multi – cellular animals.

43
Q

What is Oscillatoria?

A

A type of bacteria that forms colonies by joining the cells side-by-side

44
Q

Give an example of prokaryotic cells.

A

Bacteria.

45
Q

Describe a prokaryotic cell.

A

A cell that has no nucleus or organelles.

46
Q

How do you prokaryotic cells, such as bacteria, store chlorophyll?

A

The chlorophyll is spread throughout the cell.

47
Q

How do plants store chlorophyll?

A

Inside chloroplasts.

48
Q

What are dissection microscopes used for?

A

Larger objects and solid specimens that do not allow light to penetrate through them.

49
Q

What is another name for a dissection microscope?

A

Stereomicroscope

50
Q

Give an example of something you might look at on a dissection microscope.

A

Coin, muscle tissue

51
Q

Contrast the cells of Elodea and Oscillatoria.

A

Elodea cells are rectangular and touch. Oscillatoria cells are long, thin and worm like. Elodea are eukaryotic and Oscillatoria are prokaryotic.

52
Q

Organisms that cannot make their own food by photosynthesis are called what?

A

Heterotrophs.

53
Q

name the organisms that you studied in lab that are heterotrophs.

A

Onion cells, cheek cells, potato cells

54
Q

Which features of an object are visible under the dissection microscope but not visible with the naked eye?

A

Fine lines, small writing.

55
Q

What is the maximum magnification of the dissecting microscope?

A

???

56
Q

What is the maximum magnification of a compound microscope using the oil immersion (100 X) lens?

A

1000 x?

57
Q

Give two examples of something that would be best observed with the compound microscope

A

Cells, bacteria, Pond Water, urine samples, blood samples

58
Q

Give two examples of objects that would be best observed with the dissecting microscope.

A

Muscle tissue, paper documents, fecal samples

59
Q

Name the pieces of a microscope you look through.

A

Oculars

Biology (19 decks)

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