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22 Cards in this Set
- Front
- Back
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when do you see Z DNA
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occurs in G-C rich regions
- helps regulate gene transcription - left handed helix |
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what DNA is right handed helix
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B- DNA
- 10 angstroms= diameter - 34 angstroms per turn |
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histones are in what amino acid rich regions
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Lys & Arg
- both positively charged so suitable for interacting w/ DNA |
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giant banded proteins that are produced by endomitosis
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polytene chromosomes
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what are diffuse areas on a polytene chromosome
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chromosome puffs
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term that includes nucleosome plus H1 protein
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chromatosome
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___ consist of DNA wrapped around a core of basic proteins
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nucleosomes
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what kind of heterochromatin can be active or inactive
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facultative
- at chromomeres |
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syndrome due to deletion of p arm of chromosome 5
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cri du chat
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true or false- break inbetween genes of an inversion has no effects on promoters
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true
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what kind of inversion has centromere in inverted region
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pericentric
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what kind of inversion has centromere beside the inverted region
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paracentric
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in paracentric inversions, how many of gametes are inviable?
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1/2
- one is a dicentric chromosome (break when it segregates) - other is an acentric chromosome (will not segregate) |
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what are effects of inversion
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1. reduced fertility (slightly)
2. suppression of recombination 3. altered linkage relationships 4. position effects- change from heterochromatin to euchromatin |
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what are effects of reciprocal transolcations?
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semisterility & pseudolinkage (genes on different chromosomes appear to be linked)
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what is term for missing a single chromosome
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monosomic
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what is term for missing 2 chromosomes homologous to each other
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nullisomic
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how does ligase form a phosphodiester bond
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uses ATP
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in prokaryotes, what polymerase synthesizes DNA in place of the primer
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DNA poly I
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in prokaryotes, what polymerase elongates the lagging strand & leading strand of DNA
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DNA poly III
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RNA primers are synthesized by what
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primase
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what 3 kinds of RNA are required to synthesize protein
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mRNA, tRNA, & rRNA
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