Approximately 90% of human cancer cells exhibit significant levels of telomerase. does this mean that telomerase is an oncogene?

i. yes, telomerase expression makes cells immortal, and all cancer cells are immortal, so telomerase is an oncogene.
ii. no, telomerase is not an oncogene. all immortal cells are not cancer cells. for example, stem cells are immortal but they are not transformed.
iii. no, telomerase is not an oncogene. it prevents the senescence that would occur due to shortened telomeres, but the cell prolferation might still be mitogen-dependent.
iv. yes, telomerase is an oncogene because it forms complexes with p53 and rb, leading to the inactivation of both tumor suppressors

Imagine you are introducing the lac operan and the trp operon to students who have never learned about it before. complete the table to compare the similarities and differences between the two operons

Benito is doing research on the effects of florida's elevation on its climate. his notes include the following: 1. the average elevation of florida is 30 m above sea level. 2. the highest point in florida is britton hill, which is 105 m above sea level. 3. the change in temperature from 0 m to 1,000 m is 7 °c. what can benito conclude about the effects of florida's elevation on its climate? a.) florida typically experiences cold temperatures and temperature changes within a narrow range. b.) florida typically experiences cold temperatures and temperature changes within a broad range. c.) florida typically experiences warm temperatures and temperature changes within a narrow range. d.) florida typically experiences warm temperatures and temperature changes within a broad range.

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.