LAB EXAM 1 BIO 1407 QUESTIONS AND ANSWERS

LAB EXAM 1 BIO 1407 QUESTIONS
AND ANSWERS



gram staining process - Correct Answers -1. heat fixing
2. crystal violet staining
3. iodine fixation
4. decolorize (alcohol)
5. counter stain (safranin)

heat fixing importance - Correct Answers -kills bacteria, allows sample to readily take
stains

crystal violet staining importance - Correct Answers -allows us to differentiate between
(+) and (-)

iodine fixation importance - Correct Answers -allows gram (+) staining to stay

decolorize importance - Correct Answers -takes staining away from gram (-)

monocots - Correct Answers -one cotyledon
vascular tissue scattered
pollen grain with one opening

dicots - Correct Answers -two cotyledons
vascular tissue arranged in ring
pollen grain with three openings

polyphyletic - Correct Answers -group of taxa derived from two or more different
ancestors

counterstain importance - Correct Answers -stains gram (-) pink/red

what happens if you don't use alcohol? - Correct Answers -the gram (+) and (-) stay
purple

Hyphae - Correct Answers -release enzymes and absorb nutrients from a food source

mycellium - Correct Answers -breaks down and absorbs surrounding organic matter into
nutrients that can be nourished