What is cellular aging and what causes its occurrence? What will be an ideal response?
Concepts to Consider: In cellular aging, cells lose their ability to divide. It is related to the discovery
that most cells lose the ability to produce telomerase, which is an enzyme that replicates the DNA of
the ends of chromosomes. Apoptosis, high-calorie diets, hormonal changes, malfunctions of the
immune system, and DNA damage by radiation also contribute to premature aging.
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Which part of a neuron is associated with receiving information?
A. dendrite B. cell body C. axon D. synapse
Plant tissue noted for storage, secretion, and
regeneration is
a. vascular cambium. b. parenchyma. c. collenchyma. d. sclerenchyma. e. none of these
DNA is associated with RNA and certain proteins forming chromatin
__________________ Indicate whether the statement is true or false.
During pregnancy and menopause, the rate of urinary tract infections increases because of
a) decreased estrogen. b) higher acidity. c) increased estrogen. d) immunosuppression.