Cells in multicellular organism use only one type of communication. Receptors ar

Question

Cells in multicellular organism use only one type of communication. Receptors are proteins that bind chemicals without consequences. Most of the extracellular signals pass through the membrane. "Meiosis segregates the paternal homologs into sperm and the maternal homologs into eggs." "Chromosomes are positioned on the metaphase plate by equal and opposite forces that pull them toward the two poles of the spindle." Microtubules, composed mainly by tau, are 25 nm in diameter, whereas intermediate filaments, composed by actin, are 10 nm widths. Actin binds GTP and hydrolyses it to GDP. In general, G protein-linked receptor acts through activating ion channels. meiosis Cell Cycle control Microtubule structure S-phase

Explanation / Answer

1. False. Cells use numerous kinds of signals for communication namely, endocrine signaling, paracrine signaling, neuronal signaling, and juxtacrine signaling.

2. False. The binding of receptors to the chemicals either activate or inactivate the downstream signaling molecules.

3.False. The extracellular signals usually either too big or too charged to enter the plasma membrane. Hence, they bind to the receptors in the membrane and initiate the signal processing into the cells.

4. False. During the first meiotic division, the paternal and maternal homologs cross over before being pulled apart into different cells, and hence chromosomes contain a mixture of paternal and maternal DNA. In males, all of the daughter cells in meiosis become spermatids that can undergo spermiogenesis to become sperm, while in females, one daughter cell becomes an egg while the others degenerate. This process takes place regardless of whether the chromosomes within the sperm or eggs originated from the father or the mother.

5. True. They are positioned in this manner.

6. True.

7. False. Actin binds to ATP and hydrolyzes to ADP.

8. False. G-protein linked receptors act through different methods. Ion channel signaling is only a part of them.

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