Chapter 26 - Multicellularity

Question 1

Which one of the following is a major difference between plants and animals?

Answer 1

Animal cells are able to absorb large molecules across their plasma membrane. Plant cells are not.

Question 2

In plants, growth is restricted to ____, populations of actively dividing cells at stem and root tips.

Answer 2

meristems

Question 3

Which of the following terms describes the process by which a fertilized egg develops into a multicellular organism with hundreds of different cell types, each with different structures and functions?

Answer 3

differentiation

Question 4

Specialized structures that facilitate bulk transport are found in:

Answer 4

complex multicellular organism

Question 5

Which of the following structures facilitate intercellular communication in multicellular organisms?

Answer 5

plasmodesmata

Question 6

Which of the following structures facilitate intercellular communication in multicellular organisms?

Answer 6

bulk flow

Question 7

type of connection between the plasma membranes of adjacent animal cells that permits materials to pass directly from the cytoplasm of one cell to the cytoplasm of another
- protein channel
- communicates w/ neighboring cells

Answer 7

gap flow

Question 8

Connections between the plasma membranes of adjacent plant cells that permit molecules to pass directly from the cytoplasm of one cell to the cytoplasm of another

Answer 8

plasmodesmata

Question 9

A hollow ball of cells filled with fluid that develops from the morula and is an early stage during embryo development in animals

Answer 9

blastula

Question 10

A stage of early embryo development in animals when cells of the hollow blastula migrate and reorganize to form a multilayered structure in which different cell types begin to differentiate

Answer 10

gastrula

Question 11

random motion of molecules, movement from high to low concentration

Answer 11

diffusion

Question 12

sticks cells together
- in plants ________ molecules are pectins

Answer 12

adhesion

Question 13

Does complex or simple multicellulatiry require adhesion between cells??

Answer 13

• complex requires adhesion between cells
• simple structures can form when individual cells detect food

Question 14

connections between plasma membranes of adjacent plant cells that permit molecules to pass directly to cytoplasm of one cell to the cytoplasm of another cell

Answer 14

meristems