In this lesson our instructor talks about cellular communication. First she talks about extracellular matrix, intercellular communication in plants, cell to cell communication in animal cells, and cell signaling. Second, she discusses the stages of cell signaling, cell membrane receptors, intracellular receptors, and signal transduction. Finally, she talks about second messengers and cell response. Four complete example videos round up this lesson.
plants, channels called plasmodesmata provide a means for
communication between cells by allowing the cytoplasm of adjacent
cells to be in contact with one another.
junctions are connections between cells which allow for
communication between cells and coordination of activities. Three
types of cell junctions are desmosomes, tight junctions and gap
first phase of cell signaling is the reception phase. This involves
the binding of a ligand to a receptor. This interaction induces a
conformational change in the receptor.
types of cell membrane receptors are G-protein coupled receptors,
ligand gated ion channels and receptors with intrinsic enzyme
activity, such as receptor tyrosine kinases.
transduction is the transmission of the message from the surface of
the cell to the inside of the cell via a cascade of steps, which
involve the activation of enzymes and proteins.
messengers such as cAMP, cGMP, IP3
and DAG often mediate the signal transduction pathway.
binding of a signal molecule to a receptor elicits a response by the
cell. Responses include increasing or decreasing the transcription
of a gene or increasing or decreasing the activity of a protein.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.