【多选题】Which are truth about the cellular senescence?
A.
senescence occurs at molecules level
B.
senescence occurs at cells level
C.
senescence occurs at tissues level
D.
senescence occurs at organ systems level
【单选题】Which of the following is consistent with a model for aging in which stresses leading to DNA damage cause senescence?
A.
Werner's syndrome is a premature aging illness, possibly caused by a defect in DNA repair.
B.
Dietary restriction in mammals reduces the production of DNA damaging free radicals in the mitochondria.
C.
Senescent cells in culture that have stopped dividing often express p21 and p16, proteins that are normally activated in response to DNA damage.
D.
All of these facts are consistent with a model for aging based on DNA damage.
【单选题】戴无菌手套时只允许已消毒的手指接触手套哪一面
【判断题】雁门关又名西陉关,位于中国山西省忻州市代县县城以北约20公里处的雁门山中,是长城上的重要关隘,与宁武关、潼关合称为“外三关”。
【单选题】戴无菌手套时只允许已消毒手指接触手套哪一面
【判断题】The senescence cells persist and survive for a shorter time than apoptosis.
【单选题】戴无菌手套时只允许已消毒手指接触手套哪一面: