THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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By making an RNA copy of a DNA molecule
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By combining fragments of DNA into new combinations
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By making an exact or identical copy of a DNA molecule for the next generation during the S phase of the cell cycle
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By encoding information that causes cells to grow and develop in certain ways
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Detailed explanation-1: -During DNA replication and cell division, cells can make two identical copies of DNA from each DNA strand and each daughter cell gets identical copies of DNA. In this way, organisms transmit all the necessary information to their progenies to build themselves from scratch.
Detailed explanation-2: -DNA replication occurs through the help of several enzymes. These enzymes “unzip” DNA molecules by breaking the hydrogen bonds that hold the two strands together. Each strand then serves as a template for a new complementary strand to be created. Complementary bases attach to one another (A-T and C-G).
Detailed explanation-3: -The conservative model hypothesized that each of the two strands of DNA acted as templates to create two new strands. The original strands reconnected after replication so that there was a DNA molecule containing the two original strands, and a DNA molecule containing two new strands.