When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations, they abandon support of the nodules and end the symbiosis. Why?
A. The mineral nutrients inhibit nitrogenase activity.
B. The plant can conserve valuable energy sources by terminating the symbiotic relationship.
C. Nitrogen gas is no longer available in the soil.
D. The dissolved chemical nutrients are toxic to Rhizobium bacteria.
E. Dissolved nitrogen uncurls the root hairs, releasing the nodule.
Answer: B
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Answer the following statement true (T) or false (F)
The operon segment composed of the gene that codes for a protein repressor is called the ________.
A. regulator B. structural locus C. operator D. promoter
Which of the following are qualities of any good scientific hypothesis?
I. It is testable. II. It is falsifiable. III. It produces quantitative data. IV. It produces results that can be replicated. A) I only B) III only C) I and II D) III and IV
The organism was found to have two lungs, but the left lung was much smaller than the right lung. Kelly added that the herpetology instructor had said that in most snakes, the same condition exists
If the size difference between the lungs in this organism is not a shared ancestral characteristic with its occurrence in snakes, then its existence in this organism is explained as which of the following? 1. a result of convergent evolution 2. an example of homologous structures 3. a similar adaptation to a shared lifestyle or body plan 4. a result of having identical Hox genes A) 1 only B) 1 and 3 C) 2 and 3 D) 3 and 4