In the somatic cell cycle:
Correct answer: B. DNA replication takes place in S phase
- A. In G 1 phase DNA content is double the amount of DNA present in the original cell
- B. DNA replication takes place in S phase
- C. A short interphase is followed by a long mitotic phase
- D. G2 phase follows mitotic phase
Explanation
Interphase is the stage between two successive cell divisions. During interphase, chromosomes are decondensed and are distributed throughout the nucleus. It is the largest period in the cell cycle and is divided into three phases G 1 , S and G 2 . During G 1 phase the cell grows and synthesis of tRNA, mRNA, ribosomes, enzymes and proteins necessary for DNA synthesis occurs. During S phase replication of DNA takes place. The nucleotides get assembled and DNA molecules are synthesized. During G 2 phase organelles like centrioles are doubled and mitochondria, chloroplasts etc. divide.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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