Agrobacterium tumefaciens is often used in the production of transgenic plants because of its Ti plasmid
This plasmid is usually "disarmed" by deleting its tumor genes along with the genes for producing what products that would have been advantageous to the bacterium?
opines
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A cell biologist produces a karyotype of mouse somatic cells arrested in mitosis. She sees 40 chromosomes, which is completely normal for mice. Based on this information, what is the haploid number of chromosomes for mice?
A. 10 B. 20 C. 40 D. 80 E. It cannot be determined from the information provided Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about diploid cells? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1 . Knowing this, consider how the electrons will be shared in ammonia (NH3). What do you predict about the polarity of ammonia?
A. Each H atom has a partial positive charge B. The N atom has a partial positive charge C. Each H atom has a partial negative charge D. The N atom has a strong positive charge
RecA is not the only protein that can promote branch migration. One example is called RuvAB. RuvAB:
A. can promote branch migration but the process is very slow. B. contains two donut-shaped RuvA hexamers, related in structure to DnaB helicase, that have nuclease activity. C. cleaves the Holliday intermediate by replacing one RuvA with RuvC. D. can reload DnaB helicase to reprime DNA replication after repair. E. does not require ATP hydrolysis.
Members of this genus are commonly used as model systems for studies of ecology and evolutionary
biology.
a. Ichthyostega b. Anolis c. Dunkleosteus d. Eusthenopteron e. Archaeopteryx