Công thức cấu tạo của axit amin xêrin:

Gốc R của công thức trên là

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the word that has the underlined part pronounced differently from the rest:

  study                           abandon                            Wednesday                world   

• Choose a word that has different stress pattern:

  chemical                expensive                  November                     location

• Choose the best answer for the following sentence:

  In my mother's __________ it is essential to eat a big breakfast.
  
  

• Choose the best answer for the following sentence:

  You looked terribly tired. You really __________ to get more sleep.
   

• Choose the best answer for the following sentence:

  Over recent years there has been a marked reduction __________ the number of people who have foreign holidays.
   

• Choose the best answer for the following sentence:

  Since he went to university, Mike has become very interested in __________ issues.
   

• Choose the best answer for the following sentence:

  I have searched ___________ for the book but I cannot find it.
   

• Choose one sentence that has the same meaning as the root one:

  The holiday wouldn't have cost so much if they hadn't gone abroad.
  
  

• Choose one sentence that has the same meaning as the root one:

  I would rather have an egg for breakfast.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  delights                     lives                       business               roles