DNA is a acid. Its overall form is similar to a twisted , with and molecules comprising the sides and paired combinations of the four types of making up the rungs. The most basic unit of DNA, the , consists of one sugar molecule, one phosphate molecule, and one base. These basic units are strung together into chains, and the two chains are linked via the hydrogen bonds holding the base pairs together.

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

the tricuspid valve is present between right atrium and right ventricle

what are the awnser choices? i mean, without choices, it is an incompleat