Beadle and Tatum irradiated Neurospora and initially grew the mutant strains on complete medium. How were they
able to determine the type of mutation for each strain?
a. By growing the mold on a complete medium with extra vitamins and nutrients
b. By growing the mold on minimal media supplemented with different combinations of amino acids and
vitamins
c. By growing the mold in its diploid form to see which traits were masked
d. By comparing Neurospora to other species of mold
e. By observing the marked differences in morphology between the different strains
b
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Which gland is the remnant of the "third eye"?
a. pineal b. pituitary c. thyroid d. parathyroid e. thymus
During which stage of the cell cycle is cell growth and replication of organelles most significant?
A. M phase B. G1 phase C. G2 phase D. S phase E. G0 phase
Several hypotheses have been proposed to explain the evolutionary origin of viruses. Which of the following does NOT assume that viruses evolved from living cells?
A. Viruses evolved from macromolecules-lipids, proteins, nucleic acids, and carbohydrates. B. Viruses evolved from chromosomal elements. C. Viruses evolved from plasmids that acquired genes for their own replication. D. The precursors of DNA genomes may have been self-replicating RNA molecules. E. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction.