Cell Communication 4.1 and 4.3 Direct Contact What type of cell is - - PowerPoint PPT Presentation

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Apr 03, 2024 177 likes •242 views

Cell Communication 4.1 and 4.3 Direct Contact What type of cell is this? Unit 4 Cell Communication What are the pores(openings) called? and Cell Cycle Mary Beth Cook Harrison County High School, Cynthiana KY Local Regulators- short

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Unit 4 Cell Communication and Cell Cycle

Mary Beth Cook Harrison County High School, Cynthiana KY

Cell Communication 4.1 and 4.3 Direct Contact

What type of cell is this? What are the pores(openings) called?

Local Regulators- short distances

#2- What type of transport allows Ca+2 to enter? #3-What type of transport

ccurs to release the

neurotransmitter (red dot)? What type of transport allows neurotransmitter to move from top neuron to bottom neuron? A) Diffusion B) Facilitated Diffusion C) Exocytosis D) Endocytosis

Quorum sensing

https://www.ted.com/talks/bonnie_bassler_how_bacteria_talk?language=en What do we call the cell division that bacteria/prokaryotes use to divide?

Viruses also talk

The Secret Social Lives of Viruses: https://www.nature.com/articles/d41586-019-01880-6?fbclid=IwAR0gh0FTNanJiLp1BIiT6V O7AahiJhDdT8D158URXEEqwzVcOOe10sZWXKs Some Viruses Can Eavesdrop On Their Hosts: https://www.theatlantic.com/science/archive/2018/12/some-viruses-can-eavesdrop-their-ho sts/578071/

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Long distance communication- hormones

What are the 3 steps in a signal transduction pathway? Using #’s in this diagram, identify which number/numbers are associated with that step.

Signal Transduction Pathway 4.2 & 4.3

What are two other names for water-soluble? Why is the signal not able to cross the membrane? What are two other names for lipid-soluble? Why is this signal able to cross the membrane? What is the response

ccurring in both of

these pictures? Monomer: Bond: Reaction:

Membrane bound receptors Transduction-Phosphorylation Cascade

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ANSWER- Mean 2.68+/- 2.33 out of 10

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Answer continued 4.4 Changes in Signal Transduction Pathways

Mutations in DNA can affect different portions of a receptor protein, depending on where the mutation occurred. If mutation occurs in the ligand binding site, ligand can no longer bind and cell no longer can respond to that signal. If mutation occurs on intracellular side of protein, the change in shape could either lead to a different unintended cellular response, or to no response, because this shape doesn’t activate the next step in transduction.

4.5 Feedback- maintain internal environment and

respond to internal/external changes

Positive- Amplify responses and processes. Variable that initiates the response is moved farther away from the initial set point Stimulus is further activated, initiates an additional response to produce a system change. Negative- Maintains homeostasis. If a system is altered, negative feedback returns the system bact to a set point.

Positive Feedback- Oxytocin Negative Feedback- Insulin and Glucagon

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4.6 Cell Cycle 4.7 Regulation of Cell Cycle Disruption to cell cycle- Cancer

Cancer cells do not follow/have 2 important characteristics of normal cells: Density dependent inhibition- crowded cells will stop dividing, not true in cancers. Anchorage dependency- normal cells must be attached to other like cells or the extracellular

matrix. Cancer cells do not.