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During cell division, a cell must first replicate its DNA (Deoxyribonucleic acid). When a cell divides into daughter cells , the DNA of the parent cell must be copied because DNA contains the genetic material of an organism. DNA replication is the process in which DNA is copied during the cell division cycle. During replication, the complementary strands of the original double helix DNA are separated and one of the two strands in the original molecule is saved in the new DNA molecule. Thus the new DNA molecule is made of an original strand and a newly synthesized strand. So the DNA replication is known as semi conservative replication. Each strand of the original DNA molecule is referred as the template strand because it provides information for the production of newly synthesized strand. It takes place inside the nucleus of a cell during the s stage of the cell cycle. During replication, helicase enzyme breaks the hydrogen bonds between the complementary bases (Adenine with Thymine, Cytosine with Guanine) and unwinds the double helix of DNA. The two separated strands create a Y-shaped replication fork and act as templates for the synthesis of new strands of DNA. Enzymes known as DNA polymerases create the new strands.

6 0

3 years ago

This cyclin is found in the s phase of the cell cycle.

wariber [46]

Answer:

Cyclines in phase s double their DNA.

Explanation: Hello, In this phase the cyclin doubles in a strictly regulated and conserved manner.

4 0

3 years ago

In a 1h nmr spectrum, the signal for a vinyl proton is generally more downfield than an alkyl proton because _____.

tamaranim1 [39]

In an 1H NMR spectrum, the signal for vinyl proton is generally more downfield than an alkyl proton because the additional magnetic field created by the π electrons causes the nearby protons to resonate at a higher frequency.

<h3>What is meant by NMR? </h3>

NMR stands for nuclear magnetic resonance. In this technique, various molecules are studied by studying the interactions of their nucleus with electromagnetic radiations and then recording their radiofrequency.

The nuclei in this case are placed in a strong magnetic field.

This effect was discovered by Zeeman. It is used to study the magnetic properties of nuclei of certain atoms so that they can be appropriately utilized.

Therefore, In a 1H NMR spectrum, the vinyl proton signal is more downfield than an alkyl proton because the additional magnetic field created by the π electrons causes the nearby protons to resonate at a higher frequency.