Bacteria are good models to use because they
A. are large in size.
B. share many biochemical/physiological properties with more complicated organisms.
C. can be assembled into multicellular organisms.
D. have complicated growth requirements.
B
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We have a family of genes that code for different forms of myosin. How could this family of genes have arisen?
A. There is duplication of the original myosin gene, and the resulting copies have diverged. B. Two different original genes accumulated mutations and converged on myosin. C. There is duplication of the original myosin gene without divergence. D. Lateral gene transfer from a bacterium occurs as a result of infection.
Bread mold can grow in a minimal medium without supplements (wild type) while certain mutated strains (mutants) can only grow in a minimal medium that is supplemented with specific intermediates found in the following metabolic pathway for arginine synthesis:
minimal ------> ornithine -------> citrulline ------> arginine, where enzyme 1 converts the precursor to ornithine, enzyme 2 converts ornithine to citrulline, and enzyme 3 converts citrulline to arginine. Which of the following would be TRUE of a strain that can grow in minimal medium containing ornithine, citrulline, or arginine, but not in minimal medium alone? A. The strain would have a mutation in the gene that encodes enzyme 1. B. The strain would have a mutation in the gene that encodes enzyme 2. C. The strain would have a mutation in the gene that encodes enzyme 3. D. The strain would have a mutation in the gene that encodes for enzymes 1, 2, and 3. E. The strain would be the wild type with no genetic mutations.
All of the following are innervated by the Ophthalmic Nerve (V1 of the Trigeminal Nerve, CN V), EXCEPT
A. Bridge of Nose B. Conjunctiva of Eye C. Scalp of Forehead D. Upper Eyelid E. Upper Lip
What is the main function of the bacterial cell wall?
a. Synthesis b. Excretion c. Reproduction d. Protection