Which of the following has a triple helix structure?     α-keratin.     Collagen.     Amyloid.     Silk fibroin.     Terpenoids.

Cardiac muscle cells undergo a great deal of physical stress during contraction in order to pump blood throughout your body. Which of the following would you expect to see present in relatively large numbers within their plasma membranes to counter that physical stress acting like Velcro? O transport proteins O tight junctions O desmosomes O glycolipids O cholesterol

Fatty acids that are ester-bonded to glycerol (as glycerol-3-phosphate membrane lipids) can be found in all of the following eukaryotic organelles except: the mitochondrion the ribosome the peroxisome the nucleus the lysosome

Which of the following statements regarding kinesin are TRUE? (More than one answer is correct) Group of answer choices The majority of kinesin family members move along microtubules toward the (-) end Differential affinity of ATP- and ADP-bound kinesin for microtubules is important for kinesin walking The coiled-coil structure that links the two myosin motor proteins unwind after each step, requiring kinesin to periodically pause during transport and reenergize using ATP hydrolysis Kinesin movement is reminiscent of an inebriated individual walking (and carrying a balloon!)

What types of bonds are important for each level of protens

How does polarity and or hydrogen bonds make the the cohesion possible

can microtubule replace actin filament？why or why not？

The fatty acids below can be esterified to a glycerol molecule to form glycerophospholipids that, in turn, could aggregate to form a lipid bilayer. Arrange the fatty acids starting from which fatty acid will produce the least rigid bilayer going to the fatty acid that will produce the most rigid bilayer. • 14:0 • 12:0 • 22:0 • 18:0 O 12:0 < 18:0 < 14:0 < 22:0 O 14:0 < 12:0 < 22:0 < 18:0 O 22:0 < 18:0 < 14:0 < 12:0 O 12:0 < 14:0 < 18:0 < 22:0

Choose the best statement regarding the R groups of amino acids in an alpha helix. Group of answer choices They are located in the interior of the helix. They stick out from the axis of the helix. They participate in H-bonds that stabilizes the helix. They are completely incompatible with helix formation.

Prion strucutre: If your good normal cellular prion spontaneously misfold into a disease causing prion, which level(s) of protein structure are the same between the good normal cellular prion and the misfolded prion? quaternary only both primary and secondary both primary and tertiary primary level only