The advantages of artificial blood are as follows -
a) It is easy to produce large amount of artificial blood and thus it helps in reducing the blood shortages.
b) The chances of spreading a disease through blood are also reduced as the blood is made in a safe and secure place. Also the full history of artificial blood is known to the doctors.
Well, the word medicine is the general synonym of antibiotic - they mean the same thing.
Answer:
There is gravitational attraction between them
certain hydrogen bonds are formed so that A goes with T and G with C