# GATE2016-9

Cesium chloride density gradient centrifugation is commonly used for the separation of DNA molecules. The buoyant density, $\rho$ of a double stranded $Cs^+DNA$ is given by the equation $\rho = 1.66 + 0.098X_{G+c}$ where $X_{G+C}$ denotes

1. total number of $G$ and $C$
2. mole fraction of $G+C$
3. number of $GC$ repeats
4. ratio of $G+C$ to $A+T$ content
in Others
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## Related questions

1
The binary operation $\square$ is defined as $a \square b = ab+(a+b)$, where $a$ and $b$ are any two real numbers. The value of the identity element of this operation, defined as the number $x$ such that $a \square x = a$, for any $a$, is $0$ $1$ $2$ $10$
2
Bacteria with two or more flagella at one or both ends are called amphitrichous peritrichous lophotrichous atrichous