Question : Which of the following statements about the cell cycle is false?
Option 1: Preparation of mitosis takes place in the G2 phase.
Option 2: In the M phase, the cell grows physically larger and copies organelles.
Option 3: In the S phase, replication of DNA takes place.
Option 4: In the G1 phase, the cell grows physically larger and copies organelles.
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Correct Answer: In the M phase, the cell grows physically larger and copies organelles.
Solution : The correct option is In the M phase, the cell grows physically larger and copies organelles.
The M phase of the cell cycle primarily involves mitosis, where the cell divides into two daughter cells. Growth and organelle duplication typically occur during the preceding phases of the cell cycle, such as the G1 and S phases, not in the M phase of the cycle.
The cell cycle consists of interphase, which includes G1 (cell growth), S (DNA synthesis), and G2 (preparation for division), followed by the M phase (mitosis and cytokinesis), where the cell divides into two daughter cells.
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Question : In leaves, transpiration takes place through ______.
Option 1: stomata
Option 2: cork cell
Option 3: epidermal cell
Option 4: guard cells
Question : An enzyme produced by HIV that allows the integration of HIV DNA into the host cell's DNA is:
Option 1: Ligase
Option 2: Integrase
Option 3: Helicase
Option 4: DNA gyrase
Question : Which cell organelles are the site of photosynthesis and also contain chlorophyll?
Option 1: Chloroplast
Option 2: Vacuole
Option 3: Cytoplasm
Option 4: Nucleolus
Question : Which of the following cell organelles is made up of ribosomal RNA and protein?
Option 1: Ribosome
Option 2: Nucleus
Option 3: Golgi body
Option 4: Lysosome
Question : Which of the following options is not correct about plant cells?
Option 1: The cell wall of a plant cell is made up of cellulose.
Option 2: The plant cells cannot divide by mitosis.
Option 3: A plant cell usually contains a large vacuole.
Option 4: Generally, all plant cells contain chloroplast.
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