8. Cell radiosensitivity depends on the part of the cell cycle cell is in. The most sensitive phase is: a. G₂ phase b. late S phase c. mid-S phase d. Mitosis plus late G₁ and early S phase e. the whole interphase 9. Interphase death affects cells at lower dose compared to other cells: a. cells that are not highly mitotic b. cells that are highly mitotic 10. Which of the acute radiation syndromes is threshold dose dependent? a. bone marrow syndrome b. hemopoietic syndrome d. nervous system syndrome e. all of the above 11. What is the estimated SED 50 for humans? c. gastrointestinal syndrome a. 250-400 Rads b. 600 R c. 1,000 R d. 10,000 R e. above 10,000 R

Which phase of the cell cycle is NOT part of interphase? Group of answer choices A. G1 B. S C. M D. G2

46. If a cell does not receive a go ahead signal at the G1 checkpoint in the cell cycie then it will a. proceed On to the "S" phase b. go directly to jail - Do not pass GO. DO nột collect $200 c. proceed to mitosis d. enter a nondividing state called the Go phase 47. When T2 phages infect bacteria and make more viruses in the presence of radioactive phosphorus, what is the result? The bacterial DNA will be radioactive. b. The viral DNA will be radioactive. The bacterial DNA will be radioactive. c. The viral DNA will be radioactive. The viral proteins will be radioactive. d. The viral DNA will be radioactive. The viral proteins will be radioactive. e. 48. Each amino acid attaches to its proper tRNA with the help Of a. DNA b. an enzyme and ATP c. an enzyme d. ATP e. an enzyme and DNA

9 For the cell cycle to progress normally, the protein by Select one: a. cdk, a protease b. cyclin, apoptosis c. nuclear membrane, phosphorylation d. cyclin, a protease e. cdk, apoptosis Cycle HW due Nov 3rd at 5pm Jump to... ( must be destroyed Next page cancer stem cells►

A tumor suppressor gene ___regulates the cell cycle; an example is _____. Select one: a. negatively, cyclin b. positively, retinoblastoma c. positively, p21 d. negatively, retinoblastoma e. positively, RAS

Cyclins and cyclin-dependent kinases regulate progression through the cell cycle. Which of the following determines progression beyond the restriction point in G1? Select one: a. The presence of cyclin and Cdk. O b. The presence of cyclin. c. Phosphorylation of RB by Cdk. d. The presence of external signals from growth factors. e. The absence of cyclin.