Messenger RNAs containing premature stop codons are destroyed by the mechanism of
A) nonstop decay.
B) directed RNase activity.
C) nonsense-mediated decay.
D) error-mediated repair.
E) none of the above
C) nonsense-mediated decay.
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Blood returning to the heart enters:
a. a ventricle b. the aorta c. an atrium d. a capillary bed e. all of these
Which of the studies below provide evidence linking genes and behavior? (Check all that apply)
_____ Fruit flies that are mutant for the genes dunce or rutabaga have impaired learning. _____ Mice that are lacking either the ephrinB3 or the EphA4 gene cannot walk normally, but instead hop like a kangaroo. _____ Two lines of fruit flies were created by repeatedly selecting for high or low aggressive behavior. After multiple generations, the high line was reliably more aggressive than the low line. _____ Twin studies comparing monozygotic and dizygotic twins have found a high heritability for height, although environmental influences like nutrition also play a role. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about the genetics that underlies a behavior? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection 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?
When toxic chemicals enter the environment, there is a good chance that they will fid their way into food chains and
food webs. Such was the case with DDT, a chemical that was used to control mosquitoes before it was banned in 1972. The processes that proved DDT to be so dangerous could be manifested in other substances like heavy metals, other pesticides and radioactive isotopes. Use the example of DDT to explain why these chemicals can have such far-reaching effects, making sure you use the terms bioaccumulation, persistence, and biological magnification. What will be an ideal response?
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A) anaerobic Bacillus species B) Clostridium species C) Rhizobium species D) Azotobacter species E) cyanobacteria