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用³²P和³⁵S分别标记噬菌体的DNA和蛋白质外壳，然后用这种噬菌体去侵染大肠杆菌，则新形成的第一代噬菌体中 (　　)

Dunnottar Castle (城堡)

    Castle open times:

    Summer season: (April 1^st - September 30^th ) 9:00-5:30 every day.

    Winter season: (October 1^st -March 31^st )

    Oct 1^st - Oct 28^th 10:00-4:30

    Oct 29^th -Nov 11^th 10:00-3:30

    Nov 12^th -Nov 25^th 10:00-3:00

    Nov 26^th- Jan 20^th 10:00-2:30

    Jan 21th-Feb 3^rd 10:00-3:00

    Feb 4^th- Feb 17^th 10:00-3:30

    Feb 18^th- Feb 24^th 10:00-4:00

    Feb 25^th- Mar 31^st 10:00-4:30

    Bad Weather Conditions:

    Before going to the Castle, we advise you to visit our website(www. dunnottar.com)to make sure that the Castle is open. On the days of bad weather, the castle may be closed for safety reasons.

    Prices:

    Adult ticket:

    Children ticket:

    Guide Book:

    Buy tickets at the door.

    We do not offer pre-booking(预定)for tickets.

    Castle Closure Dates:

    The Castle will be closed on the following dates-25th of December and the 1^st 2^nd of January.

    Post code: AB39 2TL

    Dogs: Dogs are welcome at the Castle as long as they are kept on a leash(皮带) at all times.