What is the point at which dna strand is unzipped so that it can form new complimentary strands?

origin point.

Explanation:

Before deoxyribonucleic acid (DNA) replication starts, two DNA strands separate from each other. This is effected by the action of an enzyme known as helicase which breaks the hydrogen bonds between the two strands allowing them to separate. The point at which this separation begins is known as the origin point.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.