What was the significance of Beadle and Tatum's experiment?
A) It resulted in the central dogma.
B) It led to the discovery of bread mold.
C) It resulted in the one-gene-one-enzyme hypothesis.
D) It led to the discovery of the genetic code.
E) It proved that X-rays were mutagens.
C
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do nitrogen-fixation nodules contain large amounts of leghemoglobin?
A. It helps transport oxygen to the bacteria. B. The nitrogenase enzyme interacts with the iron in the leghemoglobin. C. The leghemoglobin helps break the triple bond of N2. D. It stimulates the Nod factors. E. It prevents carbon dioxide from inhibiting the nitrogenase enzyme.
When solutes are unloaded from phloem, water ____
a. is pumped into the phloem by active transport b. leaves the xylem by osmosis c. moves into the phloem by facilitated diffusion d. is pumped out of the phloem by active transport e. leaves the phloem by osmosis
A species has n=4 chromosomes. Genes on the same chromosome have a maximum recombination recombination rate of:
a. 100% b. 75% c. 50% d. 25% e. 0%
Trait SpeciesABCDE110000211111311111411110511100611000The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, while a "1" indicates the derived condition. Based on this data, which pair of species diverged most recently?
A. 2 and 3 B. 2 and 4 C. 6 and 4 D. 6 and 5 E. 1 and 4