Immature versions of all the major organ systems have formed by about what point in pregnancy?
A) 16 days B) not until at least 30 weeks
C) 3 weeks D) 12 weeks
Answer: D
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
Which of the following is not true of nucleic acid and protein structure?
A. Nucleotides are connected through phosphodiester bonds. B. Both proteins and nucleic acids are unbranched polymers. C. When several nucleic acids are joined together, a polypeptide is formed. D. The chemical composition of a nucleic acid helps determine its structure. E. The chemical composition of a protein helps determine its structure.
A single DNA unit that enables the simultaneous regulation of more than one coding region in response to environmental changes is called a(n)
A) promoter. B) operator. C) regulator. D) inducer. E) operon.
A taxon is the general name for a group of organisms that exhibit a set of shared traits.
Answer the following statement true (T) or false (F)