Trong kĩ thuật di truyền, trật tự các bước nhằm tạo một plasmit ADN tái tổ hợp là:

A.   Tinh sạch ADN mang gen mong muốn - gắn ADN mang gen vào ADN của plasmit.

B.   Tinh sạch ADN mang gen mong muốn - cắt ADN mang gen và ADN của plasmit bởi cùng một enzyme - dùng enzyme gắn đoạn ADN mang gen vào ADN plasmit, đóng vòng ADN plasmit

C.   Tinh sạch ADN mang gen mong muốn - đưa đoạn ADN này vào tế bào chất của vi khuẩn - dùng enzyme gắn đoạn ADN này với ADN vi khuẩn.

D.   Tinh sạch ADN mang gen mong muốn - trộn các đoạn ADN đã phân lập với vi khuẩn chủ đã xử lí bằng CaCl2 - gắn đoạn ADN mang gen vào plasmit có mặt trong tế bào chất của vi khuẩn.

Mon, Dec 6th ,…

“Yellow flowers on the green grass” is a 2015 Vietnamese drama, which was directed by Victor Vu. It is adapted from the novel of the same name by Nguyen Nhat Anh. The film stars Thinh Vinh and Trong Khang. Although there aren't any famous actors, the film attracted a large audience.

The film is about the childhood of the brothers Thieu (Thinh Vinh) and Tuong (Trong Khang) in a poor rural village in central Vietnam in the 1980s. They share and do everything together. However, when their friend next door Man (Thanh My), comes to stay with them and a big flood hits their village, there is a big misunderstanding that leads to Tuong's back injury. The film has an open ending with the scene of Thieu and Tuong studying in their house.

The film received many positive reviews from critics for its touching story, beautiful and familiar scenery of the country in Vietnam, and the especially impressive acting of three main actors.

The film touches audiences' hearts because it is about a story of childhood but it is not childish nor for only children; it's for adults who used to be children. It makes them cry and laugh together when they remember their own childhood, hometown and family. The film is well worth watching.

Posted by Trang at 3:30 p.m.

Choose the best options to answer the following questions.

What kind of film is ‘Yellow flowers on the green grass'?

A. It's a romantic film.

B. It's a documentary.

C. None are correct.

b) Từ x/3=y/4 va y/5=z/6-->x/15=y/20=z/24 (1)
(1) = 2x/30=3y/60=4z/96=(2x+3y+4z)/186 (2) (t/c dãy tỉ số bằng nhau)
Ta lại có
(1) = 3x/45=4y/80=5z/120=(3x+4y+5z)/245 (3)(t/c dãy tỉ số bằng nhau)
Từ (2)(3) ta có(2x+3y+4z)/186=(3x+4y+5z)/245
Vậy M = (2x+3y+4z)/(3x+4y+5z)=186/245

a)ta có 4+x/7+y=4/7

<=>7x+28=28+4y

<=> 7x=4y

lại có x+y=22

=>4/7y+y=22

<=>11/7y=22 <=> y=14

<=> x= 4/7*14=8

vậy x=8, y=14