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An aberration in chromosome structure resulting from an error in meiosis or from mutagens; specifically, reattachment of a chromosomal fragment to the chromosome from which the fragment originated, but in a reverse orientation.


 

inversion
Biology - Terms -

A dense object lying along the inside of the nuclear envelope in female mammalian cells, representing an inactivated X chromosome.


 

barr body
Biology - Terms -

(1) The conversion of a normal animal cell to a cancerous cell. (2) A change in genotype and phenotype due to the assimilation of external DNA by a cell.


 

transformation
Biology - Terms -

A virus that infects bacteria; also called a phage. See phage.


 

bacteriophage
Biology - Terms -

The form of native DNA, referring to its two adjacent polynucleotide strands wound into a spiral shape.


 

double helix
Biology - Terms -

Sites where the replication of a DNA molecule begins.


 

origins replication
Biology - Terms -

An enzyme that links together the growing chain of ribonucleotides during transcription.


 

RNA polymerase
Biology - Terms -

The new continuous complementary DNA strand synthesized along the template strand in the mandatory 5' 3' direction.


 

leading strand
Biology - Terms -

A discontinuously synthesized DNA strand that elongates in a direction away from the replication fork.


 

lagging strand
Biology - Terms -

A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 39 end of a new DNA fragment to the 59 end of a growing chain.


 

DNA ligase
Biology - Terms -

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