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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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