The anterior pituitary secretes more ACTH, leading to more glucocorticoids in plasma, which causes the anterior
pituitary to then secrete less ACTH. This is an example of ____ regulation.
a. amplification only
b. positive feedback only
c. negative feedback
d. cascading feedback
e. both amplification and positive feedback
ANSWER: c
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Some proteins overexpressed at high levels resulting in the formation of inclusion bodies can abolish the goal of producing large quantities of active protein. What could be done to minimize this issue?
A) Codon optimize the gene. B) Decrease the number of biobricks in the vector. C) Simultaneously produce intracellular chaperonins. D) Switch to an expression host with a larger intracellular volume.
What are the most important transformers of energy in ecosystems?
A. detritivores B. plants and algae C. primary consumers. D. secondary consumers. E. None of these choices are correct.
Which time period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of
South Australia, and parts of Canada and China? a. Edicarian b. Devonian c. Cambrian d. Cretaceous e. Ordovician
Predict the outcome of protein synthesis if a gene undergoes a mutation in its anticodon region where a charged tRNA recognizes a nonsense mutation.
A. Transcription would not continue but translation would continue. B. Transcription and translation both would not continue. C. Transcription and translation both would continue. D. Transcription would continue but translation would not continue.