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Barb S 3 questions

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1Enzymes are globular [blank_start]proteins[blank_end] which act as biological [blank_start]catalysts[blank_end].
1. Aproteins
2. Bcatalysts
2Enzymes [blank_start]speed up[blank_end] the rate of reaction by [blank_start]lowering[blank_end] the activation energy.
1. Aspeed up
2. Bslow down
3. Clowering
4. Dincreasing
3Enzymes are a complex [blank_start]tertiary[blank_end] and sometimes [blank_start]quaternary[blank_end] shape.
1. Atertiary
2. Bquaternary