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生物 高校生

光学顕微鏡 ⑧の16番の答えがなぜ16になるのでしょうか?

成と発表 接眼レンズ、 鏡筒 【2】 光学顕微鏡の使い方 ① 直射 [5 〕を避け,水平な台上に置く。 ② はじめに [6 ] レンズ,次に [7 レ ンズをつける(外すときは,この逆)。 ③ 接眼レンズをのぞきながら反射鏡を動かし, レボルバー 視野全体が最も明るくなるようにする。 対物レンズ―――― ④ 最初は焦点深度が [8 〕く,視野の[9] ステージー い低倍率で観察する。 反射鏡は,ふつう低倍 率では平面鏡を使用する。 しぼり 反射鏡 ⑤ 側方から見ながらプレパラートと [10 鏡台 ] を近づけ、 次に接眼レンズをのぞ きながらそれらを遠ざけるように[11 ] をまわしてピントを合わせる。 ⑥ 鮮明な像が見えるように, [12 ] を調節する。 ] をまわして高倍率に切りかえる。 ⑦ 適当な像がみつかれば, [13 高倍率にすると視野が[14 くなるので,〔15〕面鏡を使用する。 ⑧ 接眼レンズはそのままで, 対物レンズを10倍から40倍にかえると,視野の広 さは、最初の16 ]分の1になる。 ⑨ 顕微鏡で観察したものをスケッチする際は,[17 〕と線を用いて描くように し, 塗りつぶしたり, 影をつけたりしない。 仮説 2 対照実験 3 追試 4 再現 5 日光 6 接眼 7 対物 8 深 9 広 0 対物レンズ 11 調節ねじ 12 しぼり 13 レボルバー 14 暗 15 16 16 17 点 アーム VASKE 調節ねじ

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生物 高校生

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Test II PROBLEM SOLVING Directions: Answer the question and show your complete solution in the separate paper. 1. Suppose the cells lining of your cheeks can completely di vide every 24 hours. Assuming no cells die in the process, how many cheek cells will be there after 7 days if you started with 5 cheek cells? 2. If an organism has 15 pairs of homologous chromosomes, how many chromosomes will each daughter cell have after telophase of mitosis? Test I. Complete the concept in mitosis has the Cell division Purpose of which have occurs in through (10. condeneed which Includes or noncondensed which include 5。 温 a loop of DNA which Includes (in order) which form sister 9. during 12. (13. 14. which is followed by 15. which Is followed by (16. which includes (in order). 17. 19. >(20. What's New In meiosis the cell goes through similar stages in mitosis and uses similar strategies to organize and separate chromosomes. However, the cell has a more complex task in meiosis. It still needs to separate sister chromatids (the two halves of a duplicated chromosome), as in mitosis. But it must also separate homologous chromosomes, the similar but non-identical chromosome pairs an organism receives from its two parents. These goals are accomplished in meiosis using a two-step division process. Homologue pairs separate during a first round of cell division, called meiosis I. Sister chromatids separate during a second round, called meiosis III. Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase. Stages of Meiosis I In meiosis I, homologous chromosomes are separated into two cells such that there is one chromosome (consisting of

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