A gene is said to be poised if it
a. is inactive.
b. has an assembled basal apparatus but requires a second signal for activation.
c. has a partially assembled basal apparatus.
d. is active.
e. is prevented from being expressed by chromatin structure.
Ans: b
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The first oncogene to be discovered:
A. is a gene that contributes to uncontrolled cell division or cancer. B. was first discovered in a Rous sarcoma virus that causes cancer. C. is a protein kinase that acts as a cell division trigger. D. has a less-active normal counterpart called a proto-oncogene. E. All of these choices are correct.
Immune tolerance of some self antigens need only be maintained in the T cell population because certain B cells can't become activated without the help of T cells.
Answer the following statement true (T) or false (F)
The limit of detection in the microbiology laboratory is termed:
a. specificity. b. sensitivity. c. precision. d. variation.
Wilkins and Franklin studied the structure of DNA using ____
a. molecular scale models of nucleotides b. X-ray diffraction c. computer-assisted graphics d. electron microscopy e. light microscopy