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Which of the following best describes the role of cell-to-cell communication during a response to an invasion of antigens? Chemicals that are secreted from antigen-presenting cells then activate helper T cells.
Keep it, because it provides sensory details that help the writer describe the concept being discussed in the paragraph. Study with Quizlet and memorize flashcards containing terms like In the third sentence of the first paragraph, the author mentions society's ability to "execute its own mandates" primarily to, In the context of the passage as ...
S-Interphase, G2-growth, M-division, G1-DNA replication. Which phase of mitosis occurred between panels C and D? Which of these graphs represents the amount of DNA present in a normal cell throughout the cell cycle? p53 is a gene that codes for a CDK inhibitor that slows the cell cycle.
Which statement best predicts why a cell’s progression through the cell cycle might be halted at the G1/S checkpoint? Spindle fibers have not correctly attached to chromosomes. There are not enough nucleotides available to construct new DNA.
Our AP Biology unit 4 practice test explores how a cell communicates within itself and with nearby cells. This unit takes special note of key examples of cell communication. It also emphasizes cellular communication pathways that regulate the cell cycle.
Regulation: Correct description of checkpoints, which block cell cycle progress unless specific molecular and/or physical conditions are satisfied (1 point each; 2 points maximum)
Signaling molecules (ligands) bind to receptors on the cell surface or inside the cell triggering a response. Signal transduction pathways amplify and transmit signals from receptors to cellular targets. The cell cycle is a highly regulated process that controls cell division and growth.
