Lab 2

Question 1

protein functions and detection

Answer 1

enzymes: catalyze reactions
protein fibers: cell structure, motion
storage proteins: energy/carbon/nitrogen storage (starch)
detected in embryo of corn seed using nitric acid/ammonium hydroxide (turns yellow/orange

Question 2

starch (carbohydrate) function and detection

Answer 2

carbon/energy storage for photosynthesis
detected in endosperm of corn seed using iodine (turns dark blue)

Question 3

reducing sugars (carbohydrate) function and detection

Answer 3

carbon transport
detected in apple and high fructose syrup using Benedict’s solution (redox rxn)
not detected in sucrose, disaccharide without e- available to reduce copper ion

Question 4

lipids functions and detection

Answer 4

form membranes (phospholipids)
carbon energy/storage (oils/fats)
found in droplets stored in peanut seeds using Sudan IV (hydrophobic)

Question 5

anthocyanin

Answer 5

secondary metabolite/purple pigment
found in vacuoles of cells

Question 6

carotenoids

Answer 6

yellow pigment
found in chromoplasts of cells

Question 7

how does a wilted plant change when watered?

Answer 7

it is restored to turgid and upright

Question 8

turgid cells are…

Answer 8

pressurized
pressure on cell wall from osmosis causes turgor presuure

Question 9

osmosis

Answer 9

water will move from high concentration (low solute) to low concentration (high solute)

Question 10

cell wall

Answer 10

allows turgor pressure
hexagonal thick layer around protoplast

Question 11

middle lamella

Answer 11

cement between adjacent cell walls

Question 12

plasmodesmata

Answer 12

pathways between adjacent cells

Question 13

hypertonic

Answer 13

water moves out of cell (shrink), higher solute concentration

Question 14

isotonic

Answer 14

no net movement of water into cell

Question 15

hypotonic

Answer 15

water moves into cell (swell), lowe solute concentration

Question 16

imbibition

Answer 16

movement of water into dry tissues, seed components bind water and hydrate