18 Questions
What is chemotaxis?
The directed migration of cells in response to concentration gradients of extracellular signals
How do rattlesnakes use chemical cues to track down prey?
By comparing the concentration of chemicals on their left and right sides
What is the purpose of the forked tongue in rattlesnakes when hunting?
To pick up large non-volatile chemicals exuded by the prey
What happens if the concentration of a chemical cue is greater on the right for a rattlesnake?
The snake moves towards the right
Why is comparing concentration on the two sides impossible for bacteria detecting chemical signals?
Bacteria cannot steer their movement based on comparing signals between their sensory organs
What is one problem faced by bacteria during chemotaxis due to the density of the subject?
Bacteria experience inertia which affects their movement
What does the Dead Sea Reynolds Number (Re) represent?
Efficiency of organism swimming
Why is viscosity negligible for large animals according to the text?
All the above
What characterizes laminar flow in fluids?
Smooth and regular flow paths
Why is viscosity all-important for small organisms like bacteria?
Small organisms have lower Reynolds Numbers (Re)
What is a possible solution to the 'swimming in syrup' problem mentioned in the text?
Utilize behavior like run/tumble to navigate
Why do fish have shapes that maximize laminar flow and minimize turbulent flow?
To reduce friction in water
What is the main mechanism bacteria use to navigate in response to chemical cues?
Growth of pseudopods in a biased manner
Why is direct use of sensory input for course correction not possible for bacteria?
They rely on behavior patterns that are internally regulated
What type of locomotory memory works for tracking chemical traces in bacteria?
Growth of pseudopods in a biased manner
What does increasing size help with in bacteria's navigation?
Better targeting through sampling changes over time
What is the main limitation regarding built-in behavior patterns in bacteria?
Limited modulation by temporal cues
What plays a key role in steering amoeboid movement towards the right direction in response to a chemical gradient?
Continuous projection of pseudopods
Explore the topics of cell structure, size, chemotaxis, and hunting by rattlesnakes in this quiz. Learn about the directed migration of cells in response to concentration gradients and how rattlesnakes use chemical cues to track down prey.
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