4/2 lecture

Question 1

What are reducing sugars?

Answer 1

sugars with an active aldehyde

Question 2

What are non-reducing sugars?

Answer 2

sugars without an active aldehyde

Question 3

what is phloem?

Answer 3

series of living cells that transport sucrose from the source tissues to sink tissues

Question 4

what is a sieve tube?

Answer 4

series of specialized translocation cells that are stacked to form a continuous conduit for sucrose transport

Question 5

What 3 organelles do sieve tubes lack?

Answer 5

nucleolus, chloroplasts, or a central vacuole

Question 6

What organelles do sieve have?

Answer 6

a few mitochondria, cannot live by themselves

Question 7

what are companion cells?

Answer 7

specialized cells connected to sieve tube cells by many plasmodesmata

Question 8

What is the function of companion cells?

Answer 8

perform many critical cellular functions for sieve tubes like protein synthesis and ATP production

Question 9

What is source tissue?

Answer 9

tissue that makes sucrose and other photosynthates (like leaves)

Question 10

What is sink tissue

Answer 10

tissue that must consume and/or store sucrose and other photosynthates (roots and fruits)

Question 11

Can a sieve tube transport in more than one direction?

Answer 11

No