LAB 2

Question 1

Multicellular Organism

Answer 1

Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.

Question 2

Osmosis

Answer 2

a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.

Question 3

Difference between a multicellular organism and a colonial organism

Answer 3

The difference between a multicellular organism and a colonial organism is that individual one-celled organisms from a colony can, if separated, survive on their own, while cells from a multicellular life-form (e.g., cells from a brain) cannot.

Question 4

What are microscopes used for

Answer 4

To study cells

Question 5

What kind of microscope did we use?

Answer 5

Light microscope/compound microscope

Question 6

Procedure A: Preparing slides of eukaryan single-celled and colonial protists

Answer 6

• Obtained samples of two organisms
• Prepared them on a wet mount slide
• Do not examine at 100%, since oil immersion lenses are necessary for that level of magnification

Question 7

Look at pg. 19, and know the difference between a single cell organism, and colonial organism…easy

Answer 7

…

Question 8

Procedure B: Simple Staining of an Animal and Plant Cell

Answer 8

Used a cheek cell bc cheek cells from the epithelial tissue that lines the mouth of humans and other mammals is a good representation of a generalized animal cell

Question 9

Epithelial tissue

Answer 9

Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers. This tissue is specialized to form the covering or lining of all internal and external body surfaces.

Question 10

Steps for Procedure B: Human Cheek Cells

Answer 10

1. scrap cheek with toothpick
2. place 1-2 drops of TOLUIDINE blue stain on the slide
3. rub the tip of the toothpick in the stain on the glass slide in order to transfer the cells to the slide and apply a COVERSLIP.
4. examine the prepared cells with the compound microscope
5. locate the nucleus

Question 11

Steps for Procedure B: Onion Epidermal Cells

Answer 11

…

Question 12

Epidermal cell

Answer 12

The epidermis cells (from the Greek “επίδερμίδα”, meaning “over-skin”) is a single-layered group of cells that covers plants’ leaves, flowers, roots and stems. It forms a boundary between the plant and the external environment.

Question 13

Two types of electron microscopes:

Answer 13

Transmission electron microscopes (TEM), and Scanning Electron Microscope (SEM)

Question 14

TEM good for?

Answer 14

produces two-dimensional images, and is useful for viewing details of organelles such as the endoplasmic reticulum and the nucleus

Question 15

SEM good for?

Answer 15

provides three-dimensional viewing

Question 16

resolving power:

Answer 16

refers to the ability of the viewer to see two objects of comparable size that are close together and still be able to recognize that they are two objects rather than one