(Pending a more complicated answer. :-) Exactly(?) half of your "Nuclear" DNA (DNA in the nucleus of your cells, nothing to do with nuclear energy!) is identical(?) to your mother's. All(?) of your "Mitochondrial" DNA (DNA in your "Mitochondria") is identical(?) to your mother's. (Two reasons for the the question marks would be mutations and transcription errors.) See the links.
Mitochondrial DNA, the DNA in the organelle called the mitochondria, it the DNA transmitted unchanged from mothers to their children.
Yes
similar DNA in chimpanzees and humans
No, it varies and depends on the DNA.
Yes, offspring have very similar DNA to their parents whether they are humans or sheep.
RNA
staircase
DNA from a snake and a lizard.
Most mothers were stay at home mothers in the 1950s. They took care of their children. Some mothers had to work and did jobs such as factory work, waitressing, teaching and nursing.
Ribose in RNA and deoxyribose in DNA. They are quite similar.
DNA
none because lizard DNA is lizards DNA not dog or snake DNA