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All Free Biology MCQs with Answers

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19844 questions · page 602 of 1985

6011. .............. is the period of extensive metabolic activity:

Moderate
  • A. G1
  • B. G2
  • C. S
  • D. Go

Explanation: G1 (Gap 1) is the period of extensive metabolic activity, in which cell normally grows in size, specific enzymes, are synthesized and DNA base units are accumulated for the DNA synthesis

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Correct answer: G1

6012. Which one of the following is misleadingly called resting phase?

Moderate
  • A. Interphase
  • B. Mitotic phase
  • C. G1 phase
  • D. S phase

Explanation: The period of life cycle of cell (cell cycle) between two consecutive division is termed as the interphase or misleadingly called resting phase.

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Correct answer: Interphase

6013. The phase of cell cycle in which specific enzymes are synthesized and DNA base units are accumulated for the DNA synthesis is

Moderate
  • A. GI phase
  • B. G2 phase
  • C. Go phase
  • D. S phase

Explanation: G1 (Gap 1) is the period of extensive metabolic activity, in which cell normally grows in size, specific enzymes, are synthesized and DNA base units are accumulated for the DNA synthesis.

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Correct answer: GI phase

6014. The phase of cell cycle during which the DNA is synthesized is called:

Moderate
  • A. G1
  • B. S
  • C. G2
  • D. G0

Explanation: The phase of cell cycle during which the DNA is synthesized is called synthesizes phase.

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Correct answer: S

6015. Length of cell cycle in case of human is about:

Moderate
  • A. 24 hours
  • B. 1.5 hours
  • C. 12 hours
  • D. 5 hours

Explanation: Length of each phase is variable. In the case of human cell, average cell cycle is about 24 hours, mitosis takes 30 minutes.

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Correct answer: 24 hours

6016. Length of cell cycle in yeast cell is about of ............ minutes:

Moderate
  • A. 30
  • B. 60
  • C. 90
  • D. 150

Explanation: Whereas full cycle in yeast cells is only 90 minutes

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Correct answer: 90

6017. Spindle fibers attach on to:

Moderate
  • A. Centromere of the chromosome
  • B. Kinetochore of the chromosome
  • C. Telomere of the chromosome
  • D. Tip of the chromosome

Explanation: Spindle fibers attach on to kinetochore of the chromosome.

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Correct answer: Kinetochore of the chromosome

6018. During meiosis I, the chromosomes start pairing at:

Moderate
  • A. Zygotene
  • B. Diplotene
  • C. Pachytene
  • D. Leptotene

Explanation: During zygotene or zygonema of meiotic prophase I, the chromosomes become shorter and thicker. Homologous chromosomes come to lie side-by-side in pairs. This pairing of homologous chromosomes is known as synapsis or syndesis. A pair of homologous chromosomes lying together is called a bivalent or Tetrad.

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Correct answer: Zygotene

6019. Identify the stage of meiosis in the given below figure

Moderate
  • A. Prophase
  • B. Metaphase
  • C. Anaphase
  • D. Telophase

Explanation: Above diagram shows metaphase of meiosis

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Correct answer: Metaphase

6020. Microtubules are composed of a protein _ and traces of _:

Moderate
  • A. Tubulin, RNA
  • B. Actin, RNA
  • C. Myosin, RNA
  • D. Tubulin, DNA

Explanation: Microtubules are composed of a protein tubulin and traces of RNA.

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Correct answer: Tubulin, RNA
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