Which type of skeleton is found in a sea stars?
A. Cartilaginous
B. Exoskeleton
C. Hydrostatic
D. Chitinous
E. Endoskeleton
Answer: E
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Which of the following statements is true regarding how R groups affect ?-helix stability?
A. Adjacent, oppositely charged side chains can increase stability. B. Due to its small size, glycine increases stability. C. Bulky R groups create stabilizing van der Waals forces. D. Since they are located on the exterior of the ? helix, R groups do not significantly alter stability. E. None of these answers is correct.
Which method of animal cell infection is used by enveloped viruses, but not non-enveloped viruses?
a. receptor-mediated endocytosis b. membrane-channel injection c. fusion d. diffusion
A major explosion of animal diversity in which all major marine lineages were formed took place during which period?
a. Cambrian b. Carboniferous c. Devonian d. Permian e. Proterozoic
Where does the highest rate of reabsorption occur?
What will be an ideal response?