def add_line_breaks_to_sequence(sequence, line_length):
    """
    Wraps sequences to the defined length.  All resulting sequences end in a line break.
    """
    if not sequence:
        return '\n'
    seq_with_breaks = ''
    pos = 0
    while pos < len(sequence):
        seq_with_breaks += sequence[pos:pos+line_length] + '\n'
        pos += line_length
    return seq_with_breaks