X là một tripeptit cấu thành từ các aminoaxit A, B và D (D có cấu tạo mạch thẳng). Kết quả phân tích các amino axit A, B và D này cho kết quả sau:

Khi thuỷ phân không hoàn toàn X, người ta thu được hai phân tử đipeptit là A - D và D - B. Vậy cấu tạo của X là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given:

  Arabia’s rainfall / average only 2-5 inches a year / two-year droughts / not uncommon.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  The desert today / be characterized / 700 - foot - high dunes / giant sand mountains.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  The first white man / traverse / this desert / H. St.John Philby / in the 1930s.
  
  

• Choose a word that has different stress pattern:

  temperature                 serious                awareness                 chemical

• Choose a word that has different stress pattern:

  ability              agriculture                 development                  contaminate

• Choose a word that has different stress pattern:

  government                agency               benefit                  diversity

• Choose a word that has different stress pattern:

  disappearance               vulnerable                conservation                generation

• Choose a word that has different stress pattern:

  current                 global                  crisis                 mankind

• Find a mistake in the four underlined parts of the sentence and correct it:

  Species become extinct or endangerment for a number of reasons, but the primary cause is the destruction of habitat by human activities.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Although species evolve differently, most of them adapt to a specific habitat or environment that best meets their survive needs.