Why do tumor cells in mammals have telomerase activity?
What will be an ideal response?
Tumor cells are "immortal" cells, and the enzyme telomerase is required for long-term cell viability. It has been demonstrated that mutations in genes such as TLC1 and EST1 decrease cell longevity by continuous shortening of telomere length.
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The __________ of earthworm allows them to resist desiccation in terrestrial environments
A. epidermis B. endodermis C. shell D. cuticle E. mesoglea
Root hairs are extensions of what type of cells?
A) meristematic B) vascular C) ground D) epidermal
Neurons 4591 and 4592 were just like all the other millions of neurons in the brain's center that are created during the first weeks of pregnancy. But in time Neuron 4591 became part of the brain that controls logic, while Neuron 4592 was in an area of the brain that manages emotion. Which process does this describe?
a. specialization b. differentiation c. migration d. proliferation
A(n) ________ assay is used for rapid identification of strep (group A Streptococcus) infections
A) direct fluorescent antibody B) immunodiffusion precipitation C) viral neutralization D) immunochromatographic E) immunoblot