1-When making bread, you proof the yeast by mixing with sugar in lukewarm water.

Question

1-When making bread, you proof the yeast by mixing with sugar in lukewarm water. Assuming that the yeast are alive, what happens next and why?
a) the water will become cloudy as the flagellated yest cells swim around
b) the yeast will germinate and start to form a mycelium
c) bubbles form as the yeast ferment the sugar and release carbon dioxide
d) bubbles form as they yeast produce sugar and release oxygen
e) nothing could happen since yeast are not living organism.

2-____________is the vascular tissue that conducts water and minerals from a plant's roots to its leaves.
a)endospherm
b)phloem
c)hypha
d)xylem
e)corolla

3- which of these is a bivalve?
a)clam
b) octopus
c) snail
d) squid
e) conch

4-Which of these has radial symmetry?
a) human
b) planarian
c) jellyfish
d) roundworm
e) nudibranch

5) While excavating a cave in Morocco, you come across a skeleton that looks to be human. Upon closer examiniation, you find tha the bones are disproportionately short and thick, and the sull has massive brow ridges. Carefully arranged around the skeleton are a variety of stone tools. You have most likely found the remains of:
a) a cromagnon
b) an australopitheicine
c) an early hominin
d) a neardental
e) a promisan

Explanation / Answer

1-When making bread, you proof the yeast by mixing with sugar in lukewarm water. Assuming that the yeast are alive, what happens next and why?
a) the water will become cloudy as the flagellated yest cells swim around
b) the yeast will germinate and start to form a mycelium
c) bubbles form as the yeast ferment the sugar and release carbon dioxide
d) bubbles form as they yeast produce sugar and release oxygen
e) nothing could happen since yeast are not living organism.

2-____________is the vascular tissue that conducts water and minerals from a plant's roots to its leaves.
a)endospherm
b)phloem
c)hypha
d)xylem
e)corolla

3- which of these is a bivalve?
a)clam
b) octopus
c) snail
d) squid
e) conch

4-Which of these has radial symmetry?
a) human
b) planarian
c) jellyfish
d) roundworm
e) nudibranch

5) While excavating a cave in Morocco, you come across a skeleton that looks to be human. Upon closer examiniation, you find tha the bones are disproportionately short and thick, and the sull has massive brow ridges. Carefully arranged around the skeleton are a variety of stone tools. You have most likely found the remains of:
a) a cromagnon
b) an australopitheicine
c) an early hominin
d) a neardental
e) a promisan

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