How may the degradation of telomeres result in cellular aging? What will be an ideal response?
Concepts to Consider: Telomeres, which are at the ends of chromosomes, degrade with every new
cell division. As a result, with time, the chromosome itself may degrade, thus resulting in faulty gene
expression or disruption of the cell cycle. Either of these events leads to unhealthy cells that may die or
be targeted for destruction by the immune system.
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When using the EIA test for HIV screening, BOTH false negative and false positive results are possible
Indicate whether the statement is true or false.
A new organism was identified that contained arsenic in place of phosphate in its DNA double helix structure. Based upon this information alone, it can be determined that this change will greatly alter the information encoded by this genetic material.
Answer the following statement true (T) or false (F)
Which of the following statements about action potentials is false?
A) Electrical signals are propagated along a dendrite. B) They require rapid changes in membrane potential. C) Due to leaking, membranes are subject to subthreshold depolarization, which is insufficient to produce the action potential. D) At the end of the action potential, most neurons show a transient hyperpolarization. E) A refractory period is always necessary following an action potential.
Spirilli are Gram-negative bacteria that possess internal flagella, which cause the entire cell to twist in a corkscrew
pattern.
Indicate whether the statement is true or false.