Two major sources of mutation are radiation and reactive oxygen species (ROS).The reactive oxygen species hypothesis for aging postulates that 

1) Senescence results from the accumulation of DNA, lipid, and protein damage inflicted by ROS of mitochondrial origin; and

2) Mitochondria of long-lived species should produce high ROS than do mitochondria of short-lived species.

3) the capacity of mitochondria to consume ROS might distinguish long-lived species from short-lived species, rather than differences in ROS generation. 

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#Question id: 3894

#3. Fundamental Processes

Which of the following is a DNA sequence?

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#Question id: 10996

#7. System Physiology – Animal

A ventricular depolarization wave when traveling 60° in the frontal plane will cause a large positive deflection in which of the following leads?

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#Question id: 10179

#6. System Physiology – Plant

A a plant to invest energy in developing multiple cell layers, they are shaped like pillars that stand in parallel columns one to three layers deep. Below the epidermis, the top layers of photosynthetic cells are called

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#Question id: 1409

#4. Cell Communication and Cell Signaling

Which DNA repair system is affected in patients with xeroderma pigmentosum?

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#Question id: 19353

#12. Applied Biology

Gene uidA encodes the enzyme P-glucourinidase which acts on the substrate