Why is ubiquitin nicknamed the "doom tag"?
a. When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein and
destroys it.
b. When ubiquitin binds to a target protein, the complex is sent to the proteasome and the
complex is hydrolyzed to amino acids.
c. If a cell is deficient in ubiquitin, the cell will die.
d. High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to
premature cell death.
e. Ubiquitin catalyzes the conversion of pepsinogen to active pepsin, an enzyme vital to
protein digestion in the stomach of mammals. A lack of ubiquitin in the stomach causes an
organism to starve.
B
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During implantation, the inner cell mass
develops into two flattened layers of cells called the
a. blastocyst. b. amnion. c. embryonic disk. d. chorion. e. placenta
Although, it is not known the exact cause of
colony collapse disorder, all of the following EXCEPT ____ are contributing factors. a. acute paralysis virus b. parasites c. neonicotinoids d. herbicides e. all of these
Through control of gene expression, a bacterial cell responds to changing ________ conditions.
A. internal B. protein C. genetic D. environmental
Which region of the frog blastula corresponds to the future dorsal side of the embryo?
A) morula B) primitive streak C) archenteron D) gray crescent E) blastocoel