Which type of skeleton is found in a sea stars?

A. Cartilaginous
B. Exoskeleton
C. Hydrostatic
D. Chitinous
E. Endoskeleton


Answer: E

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Where does the highest rate of reabsorption occur?

What will be an ideal response?

Biology & Microbiology