The HeLa cell line was isolated from a _____
a. chimpanzee
b. rat
c. human
d. guinea pig
e. dog
ANSWER: c
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Why would the loss of helper T cells due to HIV infection result in the immunodeficiency associated with AIDS?
A. Helper T cells are central to the activation of other parts of the immune system. B. Helper T cells are normally present in higher numbers, so their loss reduces the total number of immune cells. C. Without helper T cells, plasma cells would not secrete antibody. D. Infection of the helper T cells could lead to infection and loss of progenitor cells, thereby eliminating all immune cells.
What do bryophytes lack that make them less likely to have formed fossils?
a. Chlorophyll b. Lignin c. Deep roots d. Special cells that conduct fluids
Which of this organisms belongs to the stramenopiles , a large, diverse group of protists?
Which of the following statements about the cancer-causing BRCA1 allele is FALSE?
A. It has evolved under strong negative selection in humans B. Possession of the allele results in a greater than 50% chance of developing breast cancer C. The dN/dS >1 D. One likely hypothesis for its presence is that also is important in combating viral infections