Transcription is initiated when
A. initiation factors assemble ribosomal subunits, mRNA, and initiator tRNA
B. RNA polymerase comes to a stop sequence
C. RNA polymerase binds to a region of DNA called the promoter
D. new nucleotides are added to an existing strand of nucleotides
Ans: C. RNA polymerase binds to a region of DNA called the promoter
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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.
Which evolutionary change was not one of the four primary milestones contributing to the evolution of the seed?
a. the proliferation of flagellated sperm b. the emergence of sexually different spores c. the protection of female spores and gametophytes within the body of the sporophyte d. the trend toward reduced gametophytes e. the evolution of the ovule
How do lymph nodes aid in a cancer diagnosis?
What will be an ideal response?
Sieve tubes are part of _____
a. cortex c. phloem b. mesophyll d. xylem