The two strands of a dna molecule are said to be antiparallel what does this mean ?

The DNA molecule is composed of two strands held together by hydrogen bonds. A single strand is different at its two ends.  One end is called 5' (5 prime), the other end is called 3' (3 prime). 

The names come from the notation for the two sugar carbon atoms which participate  in the phosphodiester bonds. The different strands in the helix run in opposite directions (anti-parallel) such that at each end of the double helix, one strand is 5' and the other is 3'.

the answer would be knowledge about cars!

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.