Biology Lab 3

Question 1

What part of the microscope helps you focus the oculars?

Answer 1

Ocular adjustment.

Question 2

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

Answer 2

Stage

Question 3

What part of the microscope holds up the oculars?

Answer 3

Arm

Question 4

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

Answer 4

Coarse adjustment and fine adjustment.

Question 5

How do you turn on the light on a microscope?

Answer 5

Light switch

Question 6

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

Answer 6

Base

Question 7

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

Answer 7

Revolving nosepiece

Question 8

Objective lens

Answer 8

?

Question 9

Which objective lens is the shortest?

Answer 9

The scanning objective.

Question 10

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

Answer 10

The coarse adjustment

Question 11

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

Answer 11

The fine adjustment knob.

Question 12

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

Answer 12

The fine adjustment knob.

Question 13

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

Answer 13

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

Question 14

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

Answer 14

A very tiny wire.

Question 15

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

Answer 15

To the left.

Question 16

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

Answer 16

It is reversed and upside down.

Question 17

What number is on the low power objective?

Answer 17

10 X

Question 18

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

Answer 18

It could break the slide.

Question 19

What number is on the high power objective?

Answer 19

40 X

Question 20

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

Answer 20

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

Question 21

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

Answer 21

400 X

Question 22

What is the total magnification using the low power lens?

Answer 22

100 X

Question 23

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

Answer 23

Silk threads slide

Question 24

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

Answer 24

The scanning objective lens.

Question 25

Which objective lens has the greatest depth of field?

Answer 25

10 X

Question 26

What is another name for the Elodea plant?

Answer 26

Anachris.

Question 27

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

Answer 27

Round with thick dark edges.

Question 28

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

Answer 28

At an angle.

Question 29

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

Answer 29

Rectanglular.

Question 30

What are the numerous green structures inside the Elodea leaf?

Answer 30

Chloroplasts.

Question 31

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

Answer 31

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

Question 32

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

Answer 32

To make the onion cells more visible.

Question 33

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

Answer 33

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

Question 34

What is found inside the nucleus of a cell?

Answer 34

Chromosomes

Question 35

Where could you find human epithelial cells in your classroom?

Answer 35

Inside of your cheek.

Question 36

What organelle is most prominent in human cheek cells?

Answer 36

Nucleus

Question 37

How do human cells contrast with onion cells in shape?

Answer 37

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

Question 38

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

Answer 38

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

Question 39

What are parenchyma cells?

Answer 39

Unspecialized, mature plant cells with thin cell walls.

Question 40

What is one thing that parenchyma cells do?

Answer 40

Store starch and water.

Question 41

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

Answer 41

Purple – black bodies on the slide

Question 42

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

Answer 42

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

Question 43

What is Oscillatoria?

Answer 43

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

Question 44

Give an example of prokaryotic cells.

Answer 44

Bacteria.

Question 45

Describe a prokaryotic cell.

Answer 45

A cell that has no nucleus or organelles.

Question 46

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

Answer 46

The chlorophyll is spread throughout the cell.

Question 47

How do plants store chlorophyll?

Answer 47

Inside chloroplasts.

Question 48

What are dissection microscopes used for?

Answer 48

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

Question 49

What is another name for a dissection microscope?

Answer 49

Stereomicroscope

Question 50

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

Answer 50

Coin, muscle tissue

Question 51

Contrast the cells of Elodea and Oscillatoria.

Answer 51

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

Question 52

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

Answer 52

Heterotrophs.

Question 53

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

Answer 53

Onion cells, cheek cells, potato cells

Question 54

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

Answer 54

Fine lines, small writing.

Question 55

What is the maximum magnification of the dissecting microscope?

Answer 55

???

Question 56

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

Answer 56

1000 x?

Question 57

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

Answer 57

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

Question 58

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

Answer 58

Muscle tissue, paper documents, fecal samples

Question 59

Name the pieces of a microscope you look through.

Answer 59

Oculars