23. What doe A) Access to the Signal Molecule at does a targec require to respon

Question

23. What doe A) Access to the Signal Molecule at does a targec require to respond to an extraccl an extracellular signal molecule! B) The pre e presence of the appropriate receptor molecule propriate intercellular signaling pathways All of the above C) Ap 24-26. Identify the step in cell division by writing the letter with the correct phase. 24. Anaphase 25. Metaphase 26. Prophase 27. Some diss C olved gases cross the plasma membrane and activate intracellular enzymes directly. True B) False Most extracellular signal molecules act on because they are: A) too large to pass directly across the plasma membrane. B) too hydrophilicto pass directly across the plasma membrane cell-surface rather than intracellular receptors either too large, too hydrophilic, or both to pass directly a large, too hyd lrophilic, or both to pass directly across the plasma membrane

Explanation / Answer

1. Binary fission is a type of asexual reproduction. Mostly bacteria undergo this technique to divide. In the process of binary fission, First the cell's DNA is replicated, then the replicated DNA copies itself and move to opposite poles of the cell. This causes the lengthening of the cell. After this the equatorial plate is developed which divides the cell into two. The prokaryotic cells have single chromosome. So, during binary fission a cell from 1 N will become 2N due to replication and again become 1N due to division.

So, the correct answer is option D.

2. Ananphase is a stage of the cell cycle. During this stage, the sister chromatids separate and start moving towards the opposite poles of the cell.

So, the correct answer is option E.

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