B2 hwk due 5/5/23

Question 1

define stem cell

Answer 1

an undifferentiated cell

Question 2

give an example of a substance that moves across a cell membrane by diffusion

Answer 2

oxygen / carbon dioxide / glucose / amino acids

Question 3

what is a partially permeable membrane?

Answer 3

membrane that allows some molecules to pass through but not others

Question 4

name the process that allows the movement of particles from an area of low concentration to an area of high concentration using energy.

Answer 4

active transport

Question 5

what is the function of the valves in the heart

Answer 5

prevent back flow of blood

Question 6

what is the function of the stomata

Answer 6

pores in the surface of the leaf that allows gad exchange

Question 7

give the name of the process that describes the loss of water from the leaves by evaporation through the stomata.

Answer 7

transpiration

Question 8

what does the phloem transport?

Answer 8

sucrose

Question 9

define translocation

Answer 9

the transport of dissolved material (sucrose) within a plant

Question 10

give the term used to describe a cell that is swollen with water.

Answer 10

trugid