Cấu trúc của một nuclêôxôm gồm có
A.một đoạn phân tử ADN dài 146 cặp nuclêôtit, quấn 7/4 vòng quanh khối cầu gồm 8 phân tử histôn.
B.một đoạn phân tử ADN dài 146 cặp nuclêôtít, quấn 11/4 vòng quanh khối cầu gồm 8 phân tử histôn.
C.một đoạn phân tử ADN dài 146 cặp nuclêôtit, quấn 3/4 vòng quanh khối cầu gồm 8 phân tử histôn.
D.một đoạn phân tử ADN dài 146 nuclêôtit, quấn 7/4 vòng quanh khối cầu gồm 8 phân tử histôn.

Choose the best answer to complete the sentence.
I don't fancy going to the cinema again. I'd rather………………at home.
A.stay
B.to staying
C.to stay
D.staying

Choose the best answer to complete the sentence.
I can't help………………a little more.
A.waiting
B.have waited
C.to waiting
D.to wait

Choose the best answer to complete the sentence.
Don’t forget………………the door when you go out.
A.locking
B.lock
C.to lock
D.for locking

Choose the best answer to complete the sentence.
The policeman warned us………………there.
A.not going
B.not to go
C.not to going
D.to not go

Choose the best answer to complete the sentence.
I hate………………a child……………….
A.see/ cry
B.seeing/ to cry
C.see/ crying
D.seeing/ cry

Choose the best answer to complete the sentence.
I would like………………Holland.
A.visiting
B.to visit
C.visited
D.visit

Choose the best answer to complete the sentence.
Don't forget………………the door before………………to bed.
A.locking/to go
B.locking/going
C.to lock/going
D.to lock/to go

Choose the best answer to complete the sentence.
My family has decided………………Da Lat in the summer.
A.visited
B.visits
C.visit
D.to visit

Choose the best answer to complete the sentence.
Professional people expect………………when it is necessary to cancel an appointment.
A.you calling them
B.that you are calling them
C.that you would call them
D.you to call them