An α-helix can be represented in various ways by molecular visualisation computer software. Consider the following molecular representations of the -helix where the 'side view' of the helix shows the N-terminal at the bottom and the C-terminal at the top. The 'top view' of the helix shows the C-terminal end of the helix. Then answer the questions. Please note that more than one of the given alternatives may be correct. Choosing an incorrect answer will result in a mark deducted from the correct choices.

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