Cartilage injuries do not repair themselves because ________.
a. All of these choices are reasons cartilage injuries do not repair themselves
b. cartilage does not receive nutrients very easily
c. cartilage does not contain blood vessels
d. None of these are reasons as cartilage does heal itself.
e. cartilage does not divide in adults
a
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During the Cambrian, reefs were built by _____, but these communities were wiped out by a mass extinction about _____ million years ago
A. calcified sponges; 515 B. bacteria; 515 C. calcified sponges; 600 D. bacteria; 300 E. calcified sponges; 300
Choose the true statement about the role of polyploidization in the evolution of plant genomes.
A. Jumping of transposons is most common many generations after a polyploidization event. B. Genome downsizing following allopolyploidy usually affects the participating hybrids equally. C. Genome downsizing following allopolyploidy results mainly from duplicate gene loss. D. Crop plants rarely show evidence of polyploidization events.
Where do you predict that the highest density of mechanoreceptors in the skin would be located?
A. in the hands and face B. at the joints of the limbs C. on the dorsal side of the body D. on the soles of the feet
Which level of protein structure do the ?-helix and the ?-pleated sheet represent?
A) primary B) secondary C) tertiary D) quaternary