Chapter 26.1- 26.2

Question 1

How do eukaryotes show simple multicellularity??

Answer 1

• filaments
• hollow balls
• sheets of little differentiated cells

Question 2

Components of a simple multicellularity

Answer 2

• Cell adhesion: uses adjacent molecules to stick together
• a full range of functions: in case the cell dies
• direct contact with the environment

Question 3

advantages of multicellularity organisms?

Answer 3

• One selective helps organisms avoid getting eaten.
• able maintain the same position
• flagella helps direct food to the cell

Question 4

Disadvantages of multicellularity?

Answer 4

• cancer can be a result of cells non cooperating because cells use nutrition for personal cell and not for the growth of organism

Question 5

Complex multicellular organisms share three main functions

Answer 5

1. highly developed mechanism for cohension
2. Display specialized structures that allow cells to communicate with each other
3. complex patterns of tissue differentiation

Question 6

When is diffusion effective?

Answer 6

Only over a short distance

Question 7

When a cell is too big or thick

Answer 7

it limits the amount of oxygen that can enter the cell

Question 8

How do sponges overcompensate for their size?

Answer 8

they use pores and canals in order to still gain access to seaweed

Question 9

How do humans overcompensate for their size?

Answer 9

We circumvent diffusion by actively pumping
oxygen-rich blood through our bodies.

Question 10

How do multicellular organisms overcompensate for their size?

Answer 10

• bulk flow for humans= blood vessels/ the cirulatory system
• bulk flow for animals= vassular tissues

Question 11

Bulk flow

Answer 11

is how molecules move through
organisms at rates beyond those possible by diffusion across a
concentration gradient