Question
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1. If mammalian cells were grown in the absence of growth factors, the cells would most likey 7 If an abnormal, indestructible form of Cyclin B a)) progress through the cell cycle normally were introduced into cells, what affect would this Nothing would happen to the cell, it would b. The cell would arrest in whatever phase of t. The cell would progress through the cell be unable to transition from G2 to M would remain in Ge die would become stuck in M phase would push quickly to G2 have on the cell: c) d) el progress through the cell cycle as normal the cell cycle it was in at the time cycle until it reached M phase it would 2 Meiosis differs from Mitosis in that "Meiosis a) has a longer prophase b) involves two cell divisions c] produces haploid cells from tetraploid cells d) creates recombinants e) All of the above r.d.) The cell would immediately ente aphase and would remain in M phase (unable to get past M phase e. The cell would immediately enter M phase 3 Which of the following is characteristic of the first division of meiosis but not mitosis? and then progress normally through the cell cycle a) chromosomes are duplicated prior to division b) sister chromatids are attached to cach other at 8. The type of cell division that creates sperm and ees, cells is called mitosis the centromere c) homologous chromosomes pair ) nuclear membrane and nucleolus disappear in a) True prophase e) spindle fibers form and attach to kinetochores 4. Which of the following is FALSE about cyclin B? 9, In meiosis I, sister chromatids a It is expressed in G2 b. Is required for the activation of Cdc2 C. It cycles between active and inactive states a) go to opposite poles b) go to the same poles c)share a single kinetochore d) synapse with each other el do not exist in the cell cycle (but is always present) d It is a component of MPP e. ) its destruction is caused by API /APC S. In what phase of Mitosis does the DNA (chromatin) "first become visible? 10. A human cell ordinarily will have 23 pairs af chromosomes, for a total of 46 chromosomes. At the end of a cell cycle, including mitosis, the new cells will have? a) Interphase b)prophase ) metaphase d) anaphase e) telophase ) only the 23 paternal chromosomes only the 23 maternal chromosomes (cl)23 pairs of chromosomes; 46 total 92 chromosomes, as a result of doubling during the S-phase of the cell cycle 6. During what phases is DNA (chromatin) visible? a) interphase b) prophase and metaphase c) prophase and anaphase d)prophase, metaphase, and anaphase e) telophase
Explanation / Answer
1. The right answer is b) would remain in G0
Explanation: When growth factor is absence cell will go to G0 phase due to the absence of growth-promoting signals.
2. The right answer is b) involve two cell division
Explanation: in meiosis cell goes to two cell division in which 1 cell divides into 2 cell and then further in 2 cells. All other options are wrong.
3. the right answer is C) Homologous chromosomes pair
Explanation: During meiosis in meiosis I staggered homologous chromosomes.
4. The right answer is b) its require for the activation of cdc2
explanation: Cdc2 is activated by regulatory proteins.
