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Nat Quiz - 28 May

Which of the following is true of xylem vessels? Choose 1 or more answer
Lignin is deposited on cell walls to provide mechanical support
Cells are dead
Carry out active transport of water for faster transport of water
No cross-walls or protoplasm to reduce resistance to flow of water
Which term describes an onion epidermis?
Cell
Organ
Organ system
Tissue
Leaves have different levels of organisation. Which of the following is correct?
Leaf = Organ, Leaf mesophyll = Cell, Leaf epidermis = Tissue
Leaf = Organ, Leaf mesophyll = Tissue, Leaf epidermis = Tissue
Leaf = Organ, Leaf mesophyll = Tissue, Leaf epidermis = Cell
Leaf = Organ, Leaf mesophyll = Cell, Leaf epidermis = Cell
Which of the following statements about denaturation is false? Choose 1 or more answer
Denaturation is generally irreversible
Denaturation results in a change in specific shape of active site
Denaturation is generally reversible
Denaturation can cause soluble proteins to turn into insoluble proteins
Which of the following statements explain why enzyme activity decreases beyond optimum temperature? Choose 1 or more answer
Activation energy decreases
Kinetic energy becomes too high
Substrate are no longer complementary to shape of enzyme's active site
Bonds that give enzyme unique 3D shape are broken
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