题干

观察小鼠细胞的染色体,某兴趣小组对小鼠进行适当处理后,取出骨髓中的活细胞制成细胞悬液,经过低渗溶液处理(使染色体散开)、固定、染色后制片并观察.下列有关分析,错误的是(  )

A:骨髓中含有造血干细胞,适合作为观察染色体的材料

B:制备细胞悬液时,需使用盐酸和酒精混合液进行解离

C:低渗溶液的浓度比细胞质浓度低,导致细胞渗透吸水膨胀

D:最好选择有丝分裂中期的细胞观察染色体数目和形态特征

上一题 下一题 0.0难度 选择题 更新时间:2018-04-12 11:28:18

答案(点此获取答案解析)

B

同类题5

根据短文内容,选择最佳答案。

Hampton Court Motor Cruiser

16 Hampton Court Road        TEL:208-977-1728

    Hampton Court Motor Cruiser is a boat docked on the River Thames. Facilities(设施) include heating, Smart TV and Wi-Fi. The price per stay also includes the free use of a 4-seat electric boat and barbecue facilities. There is no staff at all on board during your stay.

Hilton London Green Park

4-6 Half Moon Street        TEL:207-629-7522

    Hilton London Green Park stays in the heart of London. It features modern rooms with air conditioning. Wi-Fi is available in public areas and is free of charge. There is also a cocktail bar on site. All children are welcome.

Arbor City

12 Osborn Street            TEL:207-247-3313

    Arbor City Hotel is just next to the Whitechapel Art Gallery. It offers free Wi-Fi and 24-hour room service. Air-conditioned rooms feature a TV, a safe and a shower. Parking is available on site and costs GBP 24 per day. For an additional charge, the hotel offers various breakfast options: English breakfast, Continental breakfast, Vegan and Dairy-free breakfast. The hotel is 10 minutes' tube ride from the West End.

Abercorn House Hostel

28-0 Bute Gardens            TEL:203-696-0215

    Abercorn House Hostel is located just a 3-minute walk from Hammersmith Underground Station, with a 24-hour front desk. Guests can stay in rooms or dormitories fitted with a wardrobe. Some come with a shower, while others offer access to a shared bathroom. They can also use a shared kitchen to prepare their meals. Wi-Fi is available and costs GBP 1 per hour. Non-smoking throughout.