Describe the relationship between telomeres and aging
What will be an ideal response?
Telomeres shorten with every cell division in normal body cells. When they are too short, the cell stops dividing and dies. Thus, telomeres are associated with aging.
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In some rocky intertidal habitats, the barnacle Chthamalus can survive across the same depths as can the barnacle Balanus
However, where the two occur together, Chthamalus adults are found only in the more stressful upper portions of the habitat where they are more prone to desiccation. This is an example of: A. the mutualistic form of symbiosis. B. intraspecific competition reducing the size of Chthamalus' fundamental niche to a smaller realized niche. C. mutualism reducing the size of Balanus' realized niche to a smaller fundamental niche. D. competitive exclusion reducing the size of Chthamalus' fundamental niche to a smaller realized niche. E. competitive exclusion expanding the size of Balanus' realized niche to a larger fundamental niche.
An ancient class of echinoderms whose members are suspension feeders with long, feathery arms is called:
a. Asteroidea. b. Crinoidea. c. Ophiuroidea. d. Echinoidea. e. Holothuroidea.
The axon hillock in the presynaptic neuron fire based on temporal and spatial summation of inputs
a. true b. false
Flagellated Protista probably gave rise to
A. Archaea. B. Animalia. C. Fungi. D. Plantae.