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- 7. If chemical signals in the cytoplasm control the progression of a cell to the M phase of the cell cycle, then fusion of a cell in G_(1) with a cell in early M phase would most likely result in the (A) Replication of chromosomes only in the G_(1) cell (B) Exiting of both cells from the cell cycle and into the G_(0) phase ndensation of chromatin in preparation of nuclear division in both cells (D) Transfer of organelles from the G_(1) cell to the cell in the M phase
- 28. Many human cells can be stimulated to divide by hormonelike growth factors that bind to receptor proteins (R) on the plasma membrane and trigger an internal signal -transduction cascade. In many cases, however, the process of contact inhibition prevents mitosis when cells are in direct contact with one another. Contact inhibition occurs when proteins called cell adhesion molecules (CAMs) interact, causing them to change shape so that the growth factor signaling proteins that normally associate with CAMs are replaced by another protein , called M. Both pathways are depicted in the figures below. square Which of the following statements accurately uses the information presented to support the hypothesis that interruption of M function in a single body cell can result in cancer? (A) Protein 3 will be prevented from interacting withCAMs, causing the cell cycle to stop permanently. (B) The ras protein will remain bound to DNA, blocking expression of genes required for mitosis. (C) Growth-factor signaling can trigger mitosis in cells that are in direct contact with other cells. (D) The receptor proteins of body cells will no longer bind to growth-factor proteins.
- Vhat type of adaptation is being described below? Swallows breed in Europe during the summer and then spend winter in Africa. Physiological Structural Behavioural
- 12. Lis t the phas es of meios is 1.
- 19. Efforts to reduce pollution began occurring later in the century. If pollution near factories was reduced, what would happen to the color of the moths'Explain your answer.