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Are both strands copied in DNA replication?
Replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. DNA replication is one of the most basic processes that occurs within a cell.
Which strand is copied in DNA replication?
leading strand
During DNA replication, one new strand (the leading strand) is made as a continuous piece. The other (the lagging strand) is made in small pieces. DNA replication requires other enzymes in addition to DNA polymerase, including DNA primase, DNA helicase, DNA ligase, and topoisomerase.
How many strands of DNA are copied?
Key terms
| Term | Meaning |
|---|---|
| Double helix | Structure of two strands, intertwining around an axis like a twisted ladder |
| DNA replication | Process during which a double-stranded DNA molecule is copied to produce two identical DNA molecules |
| Base pairing | Principle in which the nitrogenous bases of the DNA molecules bond with one another |
Are the two strands of DNA identical or complementary?
The two strands in DNA are not identical but they held together because they form hydrogen bonds with each other. So they are not identical but complementary to each other. Cytosine forms a hydrogen bond with guanine and adenine forms a hydrogen bond with thymine.
What confuses you about DNA replication?
Students sometimes confuse DNA replication with cell division. Replication does occur before cell division, but replication only concerns the DNA. Genes are segments of information on DNA strands which code for particular proteins.
How does the structure of DNA allow it to be copied?
How does the structure of DNA allow it to copy information? Hydrogen bonds (formed between bases) allow for DNA to be easily broken and copied. Because the strands are separated at the hydrogen bonds and can be copied, those strands can be easily transmitted.
Why are the 2 strands in DNA not identical but complementary?
Answer : In the helical structure of DNA, the two strands are held together by hydrogen bonds between specific pairs of bases. Cytosine from hydrogen bond with guanine, while adenine forms hydrogen bond with thymine. So the DNA stands cannot be identical, but they are complementary to each other.
What is it called when a strand of DNA isn’t copied correctly?
Mutations are DNA errors that result in population variation. Explore mutations, learning what occurs when DNA is copied incorrectly, review the causes of mutations, and discover different types of mutations, including somatic, germ-line, gene-level, and chromosomal.
What holds one strand against the other in the double helix?
The two strands are held together by bonds between the bases, adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
Which of following does not affect DNA replication?
5. Which of the following does not affect DNA replication? Explanation: The antiparallel nature of DNA and end specificity of polymerase of polymerase leads to two types of strand synthesis, leading and lagging strands. Helicase helps in the unwinding of the DNA helix.
Why are both strands of DNA not copied during DNA?
Give two reasons why both the strands of DNA are not copied during DNA transcription? Please log in or register to add a comment. a) If both the strands act as template, they would code for RNA molecule with different sequences, and in turn they code for different proteins.
What happens when DNA is replicated in a cell?
DNA replication is a crucial process; therefore, to ensure that mistakes, or mutations, are not introduced, the cell proofreads the newly synthesised DNA. Once the cellular DNA is replicated, the cell can divide into two daughter cells, which would have identical copies of the original DNA.
How are replication and transcription similar and different?
Alongside differences, there are also some similarities between DNA replication and transcription. Both replication and transcription involve binding complementary nucleic acids to DNA, which yields a new strand of either DNA or RNA. The processes can lead to errors if an incorrect nucleotide is incorporated.
What is the basis of the replication process?
The basis of the replication process is the fact that each strand of DNA can serve as a template for duplication. The process initiates at specific points, called origin of reapplication points, where the DNA double helix is unwound. A short segment of RNA, called a primer, is then synthesised and acts as a starting point for new DNA synthesis.