The ____, which includes the sharks, skates, and rays, are unique in possessing skeletons made of _____
A. Chondrichthyes; cartilage
B. Coelocanths; cartilage
C. Osteichthyes; calcium carbonate
D. Chondrichthyes; silica
E. Osteichtyes; cartilage
A
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Translation requires _____
A) mRNA, tRNA, DNA, and rRNA B) mRNA, DNA, and rRNA C) mRNA, tRNA, and rRNA D) mRNA, tRNA, and DNA
The five-toed limb of stem reptiles was modified into a limb suitable for digging. This is an example of ____.
A. convergent evolution B. morphological divergence C. analogous evolution D. morphological convergence E. distal modification
A Gram-positive psychrotrophic rod ________ is a frequent contaminant of dairy products and meat and survives phagocytosis.
A. Escherichia coli B. Mycobacterium leprae C. Clostridium perfringens D. Bacillus thuringiensis E. Listeria monocytogenes
The transmission of enteric hepatitis is most effectively prevented by
A. safe sex practices. B. immunization. C. reducing aerosol dispersion. D. vector control. E. good public sanitation and personal hygiene.