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Describe the lock and key theory in reference to the enzyme Amylase

The lock and key theory suggests that there is a complimentary shaped substrate that will fit exactly into the specific shape of the enzyme's active site. In this case, amalyase is the enzyme and the substra...
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Answered by Alexander G. Biology tutor
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Describe the structure of a protein

All proteins are polymers of amino acids arranged with varying degrees of complexity. The most basic structure is the order of amino acids, this is called the primary structure. Amino acids form peptide bond...
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Answered by Sam C. Biology tutor
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Briefly explain how Darwin formulated his theory of evolution by natural selection.

Darwin made four key observations in his studies of wild populations: members of a population of the same species vary in their traits; traits can be inherited, or passed from parents to offspring; populatio...
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Answered by Zak L. Biology tutor
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Explain how a nerve impulse causes the chambers of the heart to contract (6).

The heart's excitation is myogenic and therefore can be started without any transmission from the brain. The sino-atrial node is found behind the posterior wall of the left atrium and is where the action pot...
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Answered by Jeremy S. Biology tutor
2905 Views

Distinguish between eukaryotic and prokaryotic cells

Eukaryotic Cell - DNA with proteins; DNA surrounded by membrane; Has mitochondria; 80S Ribosome; Reproduces by mitosis; Membrane-bound organelles; Chromosome are linear; Larger in size Prokaryotic Cell - DNA...
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Answered by Jason W. Biology tutor
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