A stalked, sessile marine organism has several feathery feeding structures surrounding an opening through which food enters. The organism could potentially be a cnidarian, a lophophorate, a tube-dwelling worm, a crustacean, or an echinoderm. Which of the following traits, if found in this organism, would allow the greatest certainty of identification?
A) the presence of what seems to be radial symmetry
B) a hard covering made partly of calcium carbonate
C) a digestive system with mouth and anus separate from each other
D) a water vascular system
E) a nervous system
Three-dimensional structures of proteins: Globular protein
Comparison of de novo predictions to X-ray crystal structures
Structures of (a) free and (b) DNA-bound forms of BamHI, with DNA shown end-on, in orange
Which of the 3 structures shown below has the shortest bond length? Justify your answer.
Structures of nucleoside diphosphates and triphosphates
Genome structures of mitochondria