Which of the following statements about ubiquitin is TRUE?
A. Ubiquitin recognizes improperly folded proteins.
B. Ubiquitin targets proteins for degradation.
C. Ubiquitin targets proteins for post-translational processing.
D. Ubiquitin recognizes improperly folded proteins and targets them for degradation.
E. Ubiquitin targets proteins for degradation and post-translational processing.
D. Ubiquitin recognizes improperly folded proteins and targets them for degradation.
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The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase, as indicated by the results of a phenylalanine test. This enzyme facilitates the removal of a/an ______ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.
A. phosphate B. carboxyl C. amino D. hydroxyl
In addition to the nervous system, which vertebrate organ system controls physiological processes in animals?
A) Skeletal B) Muscular C) Respiratory D) Reproductive E) Endocrine
Brandy is made by the same process as wine, but the alcohol is then concentrated by (fermentation/distillation/filtration)
What will be an ideal response?
In an experiment, some herbaceous, nonwoody plants were exposed to frequent windy conditions or mechanical shaking for several hours per day. The flexibility of these plants was due to the ________ cells.
A. sclerenchyma B. aerenchyma C. parenchyma D. periderm E. collenchyma