题干

对观察“种子植物花药中发生的减数分裂”实验的描述,正确的是(    )

A:可选取大小适合且饱满的蚕豆花蕾中的花瓣做实验材料

B:材料采摘后应立即投入到70%的酒精溶液内固定3 h,然后置于4℃冰箱内保存

C:对材料染色可使用2%的醋酸洋红染液

D:花粉母细胞可被醋酸洋红染成深蓝色

上一题 下一题 0.0难度 选择题 更新时间:2019-08-22 10:46:14

答案(点此获取答案解析)

C

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 Choose Your One-Day-Tours!

    Tour A - Bath &Stonehenge: including entrance fees to the ancient Roman bathrooms and Stonehenge -£37 until 26 March and £39 thereafter.

     Visit the city with over 2,000 years of history and Bath Abbey, the Royal Crescent and the Costume Museum, Stonehenge is one of the world's most famous prehistoric monuments dating back over 5,000 years.

     Tour B - Oxford & Startford  including entrance fees to the University St Mary's Church Tower and Anne Hathaway's -£32 until 12 March and £36 thereafter

     Oxford: Includes a guided tour of England's oldest university city and colleges. Look over the "city of dreaming spires(尖顶)"from St Mary’s Church Tower. Stratford: Includes a guided tour exploring much of the Shakespeare wonder.

     Tour C - Windsor Castle &Hampton Court including entrance fees to Hampton Court Palace -£34 until 11 March and £37 thereafter.

Includes a guided tour of Windsor and Hampton Court, Henry VILL's favorite palace. Free time to visit Windsor Castle(entrance fees not included).With 500 years of history, Hampton Court was once the home of four Kings and one Queen. Now this former royal palace is open to the public as a major tourist attraction. Visit the palace and its various historic gardens, which include the famous maze(迷宫)where it is easy to get lost!

     Tour D -Cambridge including entrance fees to the Tower of Saint Mary the Great -£33 until 18 March and £37 thereafter.

Includes a guided tour of Cambridge, the famous university town, and the gardens of the 18th century.