Cells in the G0 state ____________. do not divide. cannot re-enter the cell cycl

Question

Cells in the G0 state ____________. do not divide. cannot re-enter the cell cycle. Have entered this from either G1 or G2 have duplicated their DNA 11. Which of the following cell populations in our body has the highest mitotic index? Neurons Hepatocytes Fibroblasts skeletal myocytes Rank the following types of cell signaling from 1 to 4, with 1 representing the type of signaling in which the signal molecule travels the least distance and 4 the type of signaling in which the signal molecule travels the largest distance. ___________ paracrine signaling ___________ contact-dependent signaling neuronal __________ signaling endocrine signaling Mitogens are _________ extracellular signals that stimulate cell division. transcription factors important for cyclin production, kinases that cause cells to grow in size. produced by mitotic cells to keep nearby neighboring cells from dividing. Which of the following proteins is the product of an immediate early gene expressed following mitogenic stimulation of cell cycle entry? E2F Rb

Explanation / Answer

10. Answer: Cells in Go phase A) do not divide
The G0 phase in the cell cycle exist in a quiescent state ,where the cell is neither dividing nor preparing to divide.

11. Answer: C) Red blood cells
Mitotic index is defined as the ratio between the number of cells in a population undergoing mitosis to the number of cells in a population not undergoing mitosis.

12. Answer is 2,1,3,4
In contact dependent signalling cells make direct physical contact through signal molecules found in the plasma membrane of the signalling cells and receptor proteins present in the plasma membrane of the target cell. So they travel very short distances.
paracrine signaling travel over short distances as it release signalling molecules into the immediate surrounding area, targeting nearby cells.
Endocrine signalling release hormones into the blood stream where they are able to travel and bind to target cells located downstream. They can travel over long distances.
Neurons receive and send signals across long distances through thin, fragile extentions called axons.

13. Answer is A)
Mitogen is a chemical substance that encourages a cell to commence cell division, triggering mitosis.

14. Answer is C)
The MYC oncogene contributes to the genesis of many human cancers

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