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DNA and RNA chapter 12
prentice hall biology
26
Biology
9th Grade
02/10/2010

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Term
transformation
Definition
one strain of bacteria changes
Term
bacteriophage
Definition
a virus that infects bacteria
Term
nucleotides
Definition
DNA is a long molecule made up of units
Term
base pairing
Definition
when two bases join
Term
chromatin
Definition
tightly packed togthere DNA and protein
Term
histones
Definition
DNA that is tightly coiled around proteins
Term
replication
Definition
before a cell divides, it duplicates its DNA in a copying process
Term
DNA polymerase
Definition
the principle enzymes involved in DNA rep.
Term
gene
Definition
coded DNA instructions that control the production of protein
Term
messenger RNA
Definition
RNA that carries copies of gene's
Term
ribosomal RNA
Definition
ribosomes made of several dozen proteins
Term
transfer RNA
Definition
transfer each ammino acid
Term
RNA polymerarse
Definition
similar to DNA polymerase
Term
PROMOTER
Definition
has a specific base sequences
Term
introns
Definition
DNA of eukaryotic genes contain sequences of nucleotides
Term
exons
Definition
DNA sequences that code for proteins
Term
codon
Definition
consists of three consecutive nucleotides
Term
translation
Definition
the decoding of a mRNA message into a polypeptide chain
Term
anticodon
Definition
complementary to one mRNA codon
Term
point mutations
Definition
gene mutations involving changes in one or few nucleotides
Term
frameshift mutations
Definition
they shift the "reading frame" of the genetic messages
Term
mutations
Definition
mistakes in the DNA
Term
polyploidy
Definition
the condition in which an organism has extra sets of chromosomes
Term
operon
Definition
a group of genes that operate together
Term
differentiation
Definition
means they become specialized in structure and function
Term
hox genes
Definition
control the differentiation of cells and tissues in the embryo
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