All of the following statements about DNA replication in prokaryotes are true except（）
A. DNA replication is conservative
B. DNA synthesis occurs in the 5’ to 3’ direction
C. Requires a 3’OH to initiate replication which is provided by an RNA primer
DNA replication initiate from specific origin
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As B-DNA is gradually heated, the absorbance at 260 nm（）
A. increases
B. decreases
C. stays the same
D. It is unpredictable
Histones are found in close association with DNA. Which of the following statements is incorrect（）
A nucleosome core is composed of ~146 bp of DNA and a histone octamer
B. Histone H1 binds to linker DNA
C. There are only four types of histones
D. Nucleosomes are evenly distribution within chromatin
Supercoiling of pure circular DNA is a result of__（）
A. underwinding or overwinding of the helix
B. the long length of the strands
C. the lack of associated histones
D. the activity of exonucleases
Which of the following is an example of highly-repetitive DNA（）
A. Globin gene family
B. Histone gene cluster
C. Minisatellite DNA
D. rDNA gene family
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