What is the Hayflick factor responsible for?

a. tissue senescence
b. organ senescence
c. organ system senescence
d. cellular senescence


Answer: d. cellular senescence

Biology & Microbiology

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Of the following, the best way to separate the effects of genes and environment in research is to study

a. identical twins b. adopted children and their adoptive parents c. fraternal twins d. identical twins raised in different environments

Biology & Microbiology

Which of the following is not part of the foregut?

A. small intestine B. stomach C. crop D. mouth E. esophagus

Biology & Microbiology

Which one of the following experiments would be considered acceptable in our society?

A) Determining the effects of cocaine use on babies born to cocaine-using mothers. B) Determining the response of a patient's "incurable" cancer to a newly developed cancer drug. C) Testing the effects of radiation exposure on volunteers. D) Testing the effectiveness of a new AIDS vaccine using deliberate exposure of human volunteers to HIV. E) Testing the effectiveness of a newly developed antibiotic using deliberate exposure of humans to antibiotic-resistant bacteria.

Biology & Microbiology

HIV uses which of the following processes to synthesize a DNA strand using its RNA genome as a template?

a) conjugation b) reverse translation c) reverse transcription d) transcription e) translation

Biology & Microbiology