A characteristic that is common to cnidarians is:
A) a medusa stage in the life cycle.
B) stinging cells.
C) that they create coral reefs.
D) a complete digestive tract.
E) an osculum.
Answer: B
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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
An acidic solution:
A. will have a pH greater than 7. B. will have a pOH less than 7. C. will have a very high concentration of hydroxyl (OH-) ions. D. will have a H3O+ concentration higher than its OH- concentration. E. will have a H3O+ concentration lower than its OH- concentration.
The purpose of the scientific method is to
A. help scientists avoid making faulty assumptions and false claims. B. win a Nobel Prize. C. control nature. D. prove the existence of God.
A population of butterflies has an allele B for big spots on the wings and b for small spots on the wings. The table below provides data about this population
Genotype BB Bb bb Number of butterflies 300 400 300 Genotype frequency 0.3 0.4 0.3 Regarding these data about the butterfly population, which of the following statements is correct? A) The population is in Hardy-Weinberg equilibrium because the number of B alleles is equal to the number of b alleles. B) The population is in Hardy-Weinberg equilibrium because half of the heterozygotes are B and half are b. C) The population is not in Hardy-Weinberg equilibrium because p2 and 2pq are different. D) The population is not in Hardy-Weinberg equilibrium because the genotype frequency of bb is greater than it would be in equilibrium.