The same hormone stimulates gene expression in one cell, but inhibits gene expression in another cell. What is the best explanation for this difference?
A. The two cells have different types of
receptors for the hormone.
B. The two cells receive different amounts of
the hormone.
C. The two cells receive the hormone at
different times.
D. The hormone is degraded more quickly in
one cell than the other.
E. The hormone can diffuse through the
plasma membrane of one cell, but not the
other.
A
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Eukaryotic mRNA but not prokaryotic mRNA contain 5' untranslated regions
A. True B. False
Which of the following statements is false?
A) Lysogeny is a process that occurs during transformation and conjugation. B) A symbiotic relationship between a phage and a bacterium apparently occurs in the process of lysogeny. C) Viral genomes comprise only genes for viral structure and assembly. D) A prophage can exist in a quiescent state in the bacterial chromosome. E) A bacteriophage that can only undergo lysis is called a virulent phage.
The nucleus of a differentiated cell contains all of the genetic information necessary to direct the development of an entire organism. This nucleus is therefore said to be ________.
Fill in the blank(s) with the appropriate word(s).
A tumor is actively producing both VEGF and FGF, factors associated with angiogenesis. However, no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that
A) the VEGF and FGF are not functional. B) angiogenesis inhibitors are in greater concentration. C) only one of the molecules is active, not both. D) angiostatin is not produced by the cancer cells. E) the tumor is metastatic.