Which of the following transcription factors is utilized by all three eukaryotic RNA polymerases?
A. TFIID
B. TBP
C. TFIIIC
D. TFIIF
E. TFIIIB
B
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RNA is incapable of forming secondary structure
Indicate whether the statement is true or false.
In which one of the following ways does a proto-oncogene differ from an oncogene?
A) Proto-oncogenes code for proteins that regulate the expression of structural genes; oncogenes code for nucleic acids involved in cell division. B) Proto-oncogenes control normal cell division; oncogenes contribute to the development of cancer. C) When oncogenes become damaged, they become proto-oncogenes. D) Oncogenes activate tumor suppressor genes; proto-oncogenes repress tumor suppressor genes. E) Proto-oncogenes cause cells to self-destruct when damaged; oncogenes cause damaged cells to repair themselves.
A 55-year-old male presents with symptoms that include weakness, loss of appetite, and anemia. Immunofixation electrophoresis reveals a heavy IgM band. Which of the following is the most likely diagnosis?
A) SCID B) multiple myeloma C) Waldenström's macroglobulinemia D) DiGeorge syndrome
Collar cells are found in:
a. segmented worms. b. sponges. c. cnidarians. d. flatworms. e. nematodes