Answer:
C
Explanation:
The origin of replication refers to the site at which DNA replication begins. The process of DNA replication - which occurs prior to cell division - generates a new copy of the DNA.
DNA replication involves unwinding of the DNA double helix, creating a Y shape called the replication fork. The two strands are then replicated, and now there are two DNA molecules, each containing one "old" DNA strand and one "new" DNA strand.
The first stage at the origin of replication is that the enzyme helicase begins splitting apart the strands of a DNA molecule. (C)
The answer is not A, as the two DNA strands are already in the double helix. The answer is not B, as the enzyme responsible for copying the DNA sequence is DNA polymerase, not RNA polymerase. The answer also cannot be D, because although short RNA primers are involved in DNA replication, this does not occur at the origin of replication.
Answer:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products.
Explanation:
C
vacuoles absorb water, so like storage
In bacteria and eukaryotes, transcription is regulated by proteins which bind to the specific sites and modulate the activities. These sites are located on the chromosome, and they are a cluster of gene sequences known as operons. Operons are under the control of a single promoter, and can be induced/repressed or may work consistently all the time. Main regulation of transcription occurs by rearrangement of histone proteins, which are located on the chromosome itself. These proteins may leave the desired gene sequence inaccessible for further operations.
