关闭图标
log图标

toefl.viplgw.cn

  • 使用手机注册
  • 使用邮箱注册
  • 手机号不能为空!

    验证码不能为空!

    用户名不能为空!

    密码不能为空!

  • 邮箱不能为空!

    验证码不能为空!

    用户名不能为空!

    密码不能为空!

已有账号? 登录到雷哥托福
关闭图标
log图标
  • 使用手机找回密码
  • 使用邮箱找回密码
  • 手机号不能为空!

    验证码不能为空!

    密码不能为空!

  • 邮箱不能为空!

    验证码不能为空!

    密码不能为空!

又想起来了
加入生词本

listen

英['lɪs(ə)n] 美['lɪsn]
vi. 听,倾听;听从,听信
n. 听,倾听

已添加
×

我要举报草莓小菇凉评论

用户头像
草莓小菇凉:说的非常好,十分有道理,棒棒棒!

06-08 15:44:55

请选择举报类型:

举报电话:400 1816 180    举报QQ:2095453331
×
logo图标
分享到雷哥托福

分享成功图标分享成功

邀请名师点评成功,管理员正在安排老师进行点评。

继续做题 返回首页
支付雷豆失败图标 雷豆余额不足 购买雷豆 返回
报告题目错误
请选择错误类型:
请描述一下这个错误:

取消

文章结构

TPO 30-L3 .Jarosite 点击收藏

标准

  • 高音
  • 静音
  • 句子
    精听
  • 全文
    精听
  • 听写
    模式
  • 点击查看本句

    听写本句 再播一遍 下一句
  • 点击查看全文

    再播一遍本文

    Listen to part of a lecture in an astronomy class.

    There's been a lot of talk recently about life on Mars, at the level of microorganisms anyway, mainly because of a few important discoveries and inventions.

    For example, one major discovery was that at one point water was present on Mars.

    How do we know?

    Well, in 2004, an exploration robot discovered jarosite there.

    Jarosite is a yellowish brown mineral with a crystalline structure that's also found on Earth.

    It contains iron, potassium and hydroxide.

    The interesting thing is that on Earth at least it needs highly acidic water to form.

    So we've got water or had it at one point.

    And since most planetary scientists believe that water is essential to life, the presence of jarosite means that one prerequisite for life was once present on Mars.

    But there's another thing about jarosite.

    One step in its formation on Earth involves microorganisms.

    They actually speed up the formation of jarosite dramatically.

    Now, theoretically it is possible for jarosite to form without the help of biological life forms.

    But we don't really know for sure if this happens cause... well, because every corner of Earth has some form of biological life.

    But jarosite on Earth incorporates all kinds of microorganisms into its crystalline structure.

    So it's possible that if the jarosite on Mars was also formed with the help of microorganisms, we might be able to detect remnants of them in the samples we find.

    And we have instruments now that will enable us to try to do this.

    For example, there's a new instrument called the microfabricated organic analyzer, or M.O.A. .

    The organic analyzer is an amazing tool.

    It will be able to collect soil samples and analyze them right there on Mars, pure, untouched samples.

    It will let us eliminate the risk we would take of contaminating the samples if they were brought back to Earth.

    And what they'll look for specifically in the soil is amino acids.

    Amino acids, as you may know, are the building blocks of proteins.

    In fact, there are twenty standard amino acids involved in making proteins and lots more that aren't.

    And here's the important thing: amino acids are what we call handed.

    They can exist in two forms, which are mirror images of each other like hands.

    Right and left hands have the same number of fingers in the same order plus one thumb.

    But right and left hands are not the same. They are mirror images.

    Well, like hands, amino acids can be right or left-handed.

    And the twenty that make up the proteins on Earth are all left-handed.

    Now, one reason the M.O.A. , the organic analyzer is so impressive is that it tests not just for the presence of amino acids but also for the handedness of amino acids.

    If amino acids are found, it would be especially interesting if they show a prevalence of one type of handedness, either left, like amino acids on Earth, or right.

    See, other physical processes in space, processes that don't involve living organisms,can create amino acids.

    But the ones synthesized through abiotic processes, which is to say not involving microorganisms, occur in equal numbers of right- and left-handed.

    So, a prevalence of left-handed amino acids would indicate they were biological in origin, which would be amazing!

    A prevalence of right-handed ones... well, that would be really amazing!

    Because the organisms that created them would be unlike anything we have on Earth, which produce only left-handed ones.

    • special
    ☞查看答案 再播一遍

联系雷哥托福

全国免费咨询热线:400 1816 180

预约托福考试规划师