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有关“低温诱导大蒜根尖细胞染色体加倍”的实验,正确的叙述是

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  • 【名词&注释】

    类比推理(analogical reasoning)、科学实验(scientific experiment)、规律性变化、真核细胞(eukaryotic cells)、遗传物质(genetic material)、木本油料植物(woody oil plants)、假说一演绎法(hypothesis-deductive method)、肺炎双球菌(diplococcus pneumoniae)、多倍体细胞(polyploid cell)、动物细胞有丝分裂(animal cell mitosis)

  • [单选题]有关“低温诱导大蒜根尖细胞染色体加倍”的实验,正确的叙述是

  • A. 可能出现三倍体细胞
    B. 多倍体细胞(polyploid cell)形成的比例常达100%
    C. 多倍体细胞(polyploid cell)形成过程无完整的细胞周期
    D. 多倍体形成过程增加了非同源染色体重组的机会

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]卷柏的配子体是在孢子壁内发育的。( )
  • A. 正确
    B. 错误

  • [单选题]科学的研究方法是取得成功的关键。下列关于人类探索遗传奥秘历程中的科学实验方法及技术的叙述,不正确的是 ( )
  • A. 孟德尔在研究豌豆杂交实验时,运用了假说一演绎法(hypothesis-deductive method)
    B. 萨顿根据基因和染色体的行为存在平行关系,类比推理出基因位于染色体上
    C. 格里菲思利用肺炎双球菌(diplococcus pneumoniae)研究遗传物质时,运用了放射性同位素标记法
    D. 沃森和克里克研究DNA分子结构时,运用了建构物理模型的方法

  • [单选题]四大木本油料植物是核桃、乌桕、油桐和油茶。( )
  • A. 正确
    B. 错误

  • [单选题]AI know what you’re thinking : pizza (比萨饼)? For breakfast? But the truth is that you can have last night’s leftovers in the a. m. if you want to
  • A. I know lots of women who skip breakfast (不吃早餐) , and they have a ton of different excuses for doing it . Some say they don’t have time. others think they’re “saving” calories (卡路里), still others just don’t like breakfast food .
    B. But the bottom line is that eating in the morning is very important when you’re trying to lose weight. “Eating just about anything from 300 to 400 calories would be better than nothing at all,” says Katherine Brooking , R , D , who developed the super-easy eating plan for this year’s “SELF CHALLENGE”. And even pizza can be healthy if it’s loaded with vegetables, and you stick to one small piece.
    C. Breakfast is one meal I never miss, and the same goes for most weight loss success stories. Research shows that eating breakfast keeps you from overeating later in the day. Researchers at the University of Southem California found that breakfast skippers have a bigger chance of gaining weight than those who regularly have a morning meal.
    D. So eat something in the morning, anything. I know plenty of friends who end up having no breakfast altogether, and have just coffee or orange juice. I say, try heating up last night’s leftovers-it may sound crazy, but if it works for you, do it! I find if I tell myself, “You can always eat it tomorrow,” I put away the leftovers instead of eating more that night. Try it…you may save yourself some pre-bedtime calories. And watch your body gain the fat-burning effects.
    E. 41. The word “leftovers” in Paragraph 1 probably means__________.
    F. food remaining after a meal B. things left undone
    G. meals made of vegetables D. pizza topped with fruit

  • [单选题]What made Professor Broad continue his search for more information on McKay?
  • A. A uniform. of McKay.
    B. A footnote about McKay.
    C. A book on McKay.
    D. A picture of McKay.

  • [单选题]葫芦科的果特称( )。
  • A. 瓜果
    B. 肉果
    C. 浆果
    D. 瓠果

  • [多选题]有关真核细胞分裂的叙述,正确的是
  • A. 无丝分裂过程核膜不消失
    B. 动物细胞仅以有丝分裂方式进行增值
    C. 动物细胞有丝分裂(animal cell mitosis)末期不形成细胞板
    D. 无丝分裂仅出现于高等生物的衰老细胞

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