What are the main structures providing tensile strength in the following?
A. animal connective tissue
B. animal epidermis
C. plant cell walls
A. collagen fibers
B. intermediate filaments
C. cellulose fibers
You might also like to view...
Which of the following statements about gills are true? Choose all that apply. (2)
What will be an ideal response?
Biologists agree that ancestors of lobe-finned fishes gave rise to tetrapods
____________________ Indicate whether the statement is true or false.
Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
A) auxin and phytochrome B) auxin and Pfr C) Pfr and phytochrome D) cytokinins and phototropins
Formation of a lipid bilayer is energetically favorable. How does this arrangement result in higher entropy for the system, and thus make bilayer formation energetically favorable?
(a) Polar head groups form a hydrogen-bonding network at the interface with water. (b) Water molecules form cagelike structures around hydrophobic molecules. (c) Hydrogen bonds form between neighboring polar head groups in the bilayer. (d) Fatty acid tails are highly saturated and flexible.