MA 2 – Flashcards
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What makes up the protein component of a nucleosome?
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two tetramers of histone proteins-The protein component of a nucleosome is composed of two tetramers of histone proteins. One tetramer is composed of two units each of histones H2A and H2B, and the other is composed of two units each of histones H3 and H4.
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Each human contains an identical set of VNTRs
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False
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VNTR
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short, repeated DNA sequences (2-20) present as tandem repeats between two restriction enzyme sites. variation in the number of repeats creates DNA fragments of differing lengths followng restriction enzyme digested-DNA fingerprinting
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In E. coli, the genetic material is composed of _
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circular, double-stranded DNA
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Viral genomes are always linear, double-stranded DNA
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fase
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What is the first order of chromatin packing
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Coiling around nucleosomes-The first order of chromatin packing occurs when DNA coils around nucleosomes, whereby DNA is reduced to about one‑third its original length
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what is the second order of chromatin packing?
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The second order of chromatin packing occurs when nucleosomes coil together to form a solenoid fiber that is 30 nm in diameter.
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Viral chromosomes exist in a variety of conformations and can be made up of
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DNA or RNA
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All EXCEPT which of the following are examples of repetitive DNA
variable number tandem repeat (VNTR) DNA
SINE DNA
telomerase gene DNA
telomere DNA
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telomerase gene DNA-The DNA sequence constituting the gene for telomerase is euchromatin and is relatively unique
