PMB 3002 - Midterm 1 questions with
answers
What does cell wall structure control? - CORRECT ANSWERS ✔✔Rate and
orientation of cell growth
(L1)
What controls rate and orientation of cell growth? - CORRECT ANSWERS
✔✔Cell wall structure (Cellulose, Hemicellulose, Pectin)
(L1)
Important functions of cell wall? - CORRECT ANSWERS ✔✔Structural
support through containing water pressure
Turgor pressure acts on cell walls to "inflate cells"
Rigidity of secondary cells walls leads to physical support.
(L1)
Key features of primary cell walls? - CORRECT ANSWERS ✔✔All cells have
one
Extensible
Made of: cellulose, hemicellulose, and pectin
(L1)
,What kind of cell wall is described by these features?
Made of: cellulose, hemicellulose, and pectin
Extensible
All cells have one - CORRECT ANSWERS ✔✔Primary cell wall
(L1)
Is cellulose extensible? - CORRECT ANSWERS ✔✔No
(L1)
How do cell walls affect cell growth? - CORRECT ANSWERS ✔✔Only PCW =
can grow
SCW = no growth
PCW and/or SCW:
regulate directionality and rate of growth
turgor pressure stretches the walls and drives growth
(L1)
What direction to cells grow in? - CORRECT ANSWERS ✔✔Perpendicular to
the cellulose
(L1)
Characteristics of Hemicellulose - CORRECT ANSWERS ✔✔Polysaccharides
Hydrogen bonds to cellulose microfibrils which when they break leads to
growth
, (L1)
Characteristics of Pectin - CORRECT ANSWERS ✔✔Polysaccharides
Interact with calcium
Viscous gel/net that holds cellulose in place
(L1)
Woody plants are mostly: - CORRECT ANSWERS ✔✔secondary cell wall, b/c
secondary cell wall allows for rigidity without relying fully on turgor pressure.
(L1)
Order of layers on outside of cell (inside to out) - CORRECT ANSWERS
✔✔Plasma membrane, SCW, PCW
(L1)
What type of cell wall is this:
All cells have one
Extensible
Made of: cellulose, hemicellulose, and pectin - CORRECT ANSWERS
✔✔Primary Cell Wall
(L1)
Secondary Cell wall characteristics - CORRECT ANSWERS ✔✔Only some
cells have one
answers
What does cell wall structure control? - CORRECT ANSWERS ✔✔Rate and
orientation of cell growth
(L1)
What controls rate and orientation of cell growth? - CORRECT ANSWERS
✔✔Cell wall structure (Cellulose, Hemicellulose, Pectin)
(L1)
Important functions of cell wall? - CORRECT ANSWERS ✔✔Structural
support through containing water pressure
Turgor pressure acts on cell walls to "inflate cells"
Rigidity of secondary cells walls leads to physical support.
(L1)
Key features of primary cell walls? - CORRECT ANSWERS ✔✔All cells have
one
Extensible
Made of: cellulose, hemicellulose, and pectin
(L1)
,What kind of cell wall is described by these features?
Made of: cellulose, hemicellulose, and pectin
Extensible
All cells have one - CORRECT ANSWERS ✔✔Primary cell wall
(L1)
Is cellulose extensible? - CORRECT ANSWERS ✔✔No
(L1)
How do cell walls affect cell growth? - CORRECT ANSWERS ✔✔Only PCW =
can grow
SCW = no growth
PCW and/or SCW:
regulate directionality and rate of growth
turgor pressure stretches the walls and drives growth
(L1)
What direction to cells grow in? - CORRECT ANSWERS ✔✔Perpendicular to
the cellulose
(L1)
Characteristics of Hemicellulose - CORRECT ANSWERS ✔✔Polysaccharides
Hydrogen bonds to cellulose microfibrils which when they break leads to
growth
, (L1)
Characteristics of Pectin - CORRECT ANSWERS ✔✔Polysaccharides
Interact with calcium
Viscous gel/net that holds cellulose in place
(L1)
Woody plants are mostly: - CORRECT ANSWERS ✔✔secondary cell wall, b/c
secondary cell wall allows for rigidity without relying fully on turgor pressure.
(L1)
Order of layers on outside of cell (inside to out) - CORRECT ANSWERS
✔✔Plasma membrane, SCW, PCW
(L1)
What type of cell wall is this:
All cells have one
Extensible
Made of: cellulose, hemicellulose, and pectin - CORRECT ANSWERS
✔✔Primary Cell Wall
(L1)
Secondary Cell wall characteristics - CORRECT ANSWERS ✔✔Only some
cells have one
