phuluong2k
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Synthesis of which of the following occurs predominently during the S phase?
a.cyclins
b.DNAses
c.histones
d.RNA polymerases
e. snRNPs
f. tubulins
Plz give explanation
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| kmp
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Ans C histones.
DNA replication takes place during the S phase.
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| Moctopod
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What about
F. Tubulins, in preparation for mitosis?
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| kmp
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Tubulins will be in G2 phase.
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| mjl1717
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This how I do it:
Interphase is: G1--S --G2/ Division occurs in Mitosis-M-phase.
G1 is the Gap between birth and DNA synthesis! (At the end of G1 centrioles pair)
G1-RNA, protein, carbs and lipod synthesis also occurs about 5 hrs.
S-chromosomal protein(eg.histones) synthesis occurs about 7 hrs.
S---*Histones are synthesized and combine with DNA/centrioles complete there replication during S phase
G2 a gap before mitosis ATP synthesis occurs about 3 hrs.
M-Mitosis
check point -At G1 is 2 cyclin D&E
check point -At G2 is 1 cyclin A&B
p53 anti oncogene can shut off cell cycle
cyclins are degraded during anaphase of the M phase.
So my answer is C.
good q!
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| phuluong2k
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OK, thanks
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