24 Questions
What is the primary reason for changing the procedure of obtaining silk from spiders?
Because the spider's intention in each given condition was unknown
What is the approximate length of silk obtained from one round of the forced spinning procedure?
200 m
What is the function of the (A)n motif in spidroin 1?
Creates the basic microstructure of the crystal part (beta-sheets)
What is the characteristic of the microstructure of spider silk?
Semi-crystalline
What is the size of the nanocrystals in spider silk?
10 nm
What is the orientation of the protein backbone in the crystals of spider silk?
Perpendicular to the slide
What is the function of the -GA-GPG- motif in spidroin 2?
Contributes to the semi-crystalline microstructure
What is the mass of the silk obtained from one round of the forced spinning procedure?
100 micrograms
What is the primary challenge in analyzing the properties of silk fibers?
Obtaining individual threads from the web
Why do scientists use scanning microscopy to measure the length of a thread?
Because the length of a thread is about 1-3 micras
What is the primary goal of the scientists in understanding the properties of silk?
To replicate the properties in industrial materials
Why did the scientists decide to use a different approach to obtain silk material?
To reduce the variability of results
What method did the scientists use to obtain consistent results from different spiders?
Letting the spider climb freely up a wood stick
What is the significance of the area below the curve in the graph?
It represents the force required to break the fiber
Why is it challenging to obtain individual threads from the web?
Because the fibers are composed of 4-6 threads
What is the primary reason for using mooring threads in the experiment?
To obtain individual threads with minimal manipulation
What is the primary reason for the biocompatibility of silk?
It is invisible to the immune system
What is the process by which artificial silk fibers are created?
SFS (Spider Fiber Spinning)
What determines the properties of fibers created through SFS?
Chemical environment of the protein solution and mechanical stress on the jet
What is the result of maximal supercontraction of silk fibers?
A state unique to each species
How many species of spiders are known to exist?
Around 50,000 species
What is unique about the properties of silk fibers from spiders 1 and 2?
They are mechanically indistinguishable
Why is silk often contaminated in artificial fibers?
Due to the protein motifs used
What is the advantage of artificial silk fibers?
They have a wide range of properties
This quiz examines the challenges of studying spider behavior and silk production, including the variability of results and the need for a controlled environment.
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