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651.

Assertion: DNA synthesis occurs in `G_(1)` and `G_(2)` periods of cell cycle. Reason: During `G_(1)` and `G_(2)` phase the DNA contents become double.A. If both assertion `&` Reason are True `&` the Reason is a corrrect explanation of the Asserion.B. If both Assertion `&` Reason are True but Reason is not correct explanation of the Assertion.C. If Assertion is Trie but the Reason is False.D. If both Assertion `&` Reason are false

Answer» Correct Answer - d
The synthesis of DNA occurs only in a restricted portionof the interphase during S period. Which is preceded and folowed by two "gap" periods of interphase (`G_(1)` and `G_(2)`) in which there is no DNA synthesis `G_(1)` is the period between the end of mitosis and the start of DNA synthesis. S is the period of DNA synthesis and `G_(2)`. the interval between the end of DNA synthesis and the start of mitosis. During `G_(2)` a cel contains two times (4C) the amount of DNA present in the original diploid cell (2C). Following mitosis the daughter cell again cell again enter the `G_(1)` period and have DNA content equivalent to 2C.
Discussion
652.

Homologous pairing in prophase I of meiosis I is calledA. SynapsisB. LinkageC. Crossing overD. Syndesis

Answer» Correct Answer - a
Discussion
653.

Cell division is tightly regulated. Which of the following is TRUE regarding mitosis OR meiosis? I. Mitosis shows no homologue pairing II. There is no S phase between meiosis I and II III. Meiosis centromeres do not divide at anaphase I.A. I and III onlyB. I and II onlyC. II onlyD. I, II and III

Answer» Correct Answer - D
Discussion
654.

During meiosis I , the chromosomes start pairing atA. ZygoteneB. PachyteneC. DiploteneD. Leptotene

Answer» Correct Answer - A
During meiosis I, the chromosomes starts pairing at Zygotene.
Discussion
655.

To build up food reserves in the cytoplasm, chromosomes become unfolded to start transcription of mRNA and RNA, during which phase of meiosis ?A. DiakinesisB. ZygoteneC. DiploteneD. Leptotene

Answer» Correct Answer - C
In diplotene stage of meiosis I, the chromosomes may unfold to nearly normal form and start transcription of mRNA and rRNA to build up food reserves in the cytoplasm. This process is is most pronounced in the primary oocytes of amphibians, reptiles and birds. in some species, the chromosomes enlarge greatly, asuuming lampbrush form.
Discussion
656.

Cell plate grows fromA. wall to centreB. one wall to anotherC. centre to wallD. any of the above

Answer» Correct Answer - C
Discussion
657.

When synapsis is complete all along the chromosomes, the cell is said to have entered a stage calledA. ZygoteneB. PachyteneC. diploteneD. diakinsis

Answer» Correct Answer - B
Discussion
658.

Which out of the following is not a divisional stageA. TelophaseB. Interphase IIC. MetaphaseD. Prophase

Answer» Correct Answer - b
Discussion
659.

Cell division in blue-green type is more or less similar to that in:A. Red algaeB. Green algaeC. Brown algaeD. Bacteria

Answer» Correct Answer - d
Discussion
660.

N/C ratio after cell divisionA. increasesB. decreasesC. remains sameD. first decreases and then increases

Answer» Correct Answer - B
Discussion