Answer:
Primase is a DNA dependent RNA polymerase. It adds RNA primer to the DNA strand and lay the foundation of DNA replication.
It is important because DNA polymerase can add nucleotides to the 3'- end of the strand.
Primase, in the form of RNA primers provide free 3'- end to the DNA polymerase and thus, help in initiating DNA replication.
At the end of replication RNA primers are removed by DNA polymerase I.
Chromosomes have lined up on the metaphase plate. During anaphase (b), the sister chromatids are pulled apart and move toward opposite poles of the cell.
Answer:
e. Purines pair with pyrimidines
Explanation:
Diameter of DNA double helix is uniform through out the structure and it is 2 nm. This uniformity is due to the base pairing between a purine and a pyramidine. Purine base is made of two rings and pyramidine base has a single ring. All the bases are either derived from purine or from pyramidine structure and a purine always pairs with pyramidine. Two purines or two pyramidines can not pair with each other. So at any point along the DNA molecule, the sugar phosphate backbones always have three ring structure between them, hence the uniform diameter.
Answer:
Water obeys the Law of Conservation of Matter despite changing into different forms because when water does change forms, the amount of water stays the same. The Law of Conservation of Matter states that before matter undergoes change, be it through physical or chemical means, the same amount of matter exists. Matter cannot be created nor destroyed during the change. When water changes from a liquid to a gas the molecules change form by breaking the bonds that held them in a liquid state, but this does not create new matter. The molecules can now move more freely but are still the same as they were before. Same goes with the change from a liquid to a solid. The molecules slow down and become more compact, forming a solid. Though again, this does not create new matter nor destroy existing matter, therefore obeying the Law of Conservation of Matter.
Explanation:
For something to be more dense, it means that it has more particles in a unit, this means it is alot of things:
>heavier
>thick
>harder to penatrate
An analogy of this: Two glasses of water are sitting on a table, gelatin (the stuff that makes jelly) is added in both and mixed evenly. There is more gelatin in glass A than glass B.
This means glass A is more dense even though it is the same size as glass B.
