If the gene for telomerase is turned off in a cell, this is an indication it is a cancer cell.
Answer the following statement true (T) or false (F)
False
Telomerase, the enzyme that keeps telomeres a constant length in cells, is turned off in normal cells but is active in cancer cells.
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Cytotoxic T lymphocytes are distinguished from other lymphocytes by the presence of ________.
A. CD4 B. CD8 C. CD19 D. All of the choices are correct.
The transduction of sound waves into electrical signals takes place
A. within the tectorial membrane as it is stimulated by the hair cell. B. within hair cells as they are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons. C. as the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in a sensory neuron. D. as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds. E. within the middle ear as the vibrations are amplified by the malleus, incus and stapes.
Public health surveillance is the proactive evaluation of
A. emerging infectious agents. B. environmental conditions. C. human behaviors and lifestyle choices. D. genetic background. E. All of the choices are correct.
Which organelle contains enzymes that break down damaged cell parts?
A.) centriole B.) lysosomes C.) vacuole D.) mitochondria