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Chapter 12: DNA (vocabulary)
dna, biology, chapter 12, science, genetics, rna, chromosomes, dna replication,
28
Biology
9th Grade
03/01/2011

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Term
transformation
Definition
process in which one strain of bacteria is changed by a gene of genes from another strain of bacteria
Term
bacteriophage
Definition
virus that infects bacteria
Term
nucleotides
Definition
monomer of nucleic acids made up of a 5-carbon sugar,a phosphate group, and a nitrogenous base
Term
base pairing
Definition
principle that bonds in DNA can form only between adenine and thymine and between guanine and cyosine
Term
chromatin
Definition
DNA and protein and tightly packed together (found in eukaryotic chromosome)
Term
histone
Definition
globular protein molecule around which DNA is tightly coiled in chromatin
Term
replication
Definition
copying process by which a cell duplicates its DNA
Term
DNA polymearse
Definition
enzyme that "proofreads" new DNA, strands, helping to ensure that each molecule is a nearly perfect copy pf the original DNA
Term
messenger RNA
Definition
RNA molecule that carries copies of instructions for the assembly of amino acids into proteins DNA to the rest of the cell
Term
ribosomal RNA
Definition
type of RNA that transfers makes up the major part of ribo0somes
Term
transfer RNA
Definition
type of RNA that transfers amino acids to ribosomes during protein synthesis
Term
transcription
Definition
process in which part of the nucleotide is copied into a complementary sequence of RNA
Term
RNA polymearse
Definition
enzyme similar to DNA polymearse that binds to DNA and seperates the DNA strands during transcription
Term
promoter
Definition
region of DNA that indicates to an enzyme where to bend inorder to make RNA
Term
intron
Definition
intervening sequence of DNA;
Term
_________ does not code for protein
Definition
intron
Term
exon
Definition
expressed sequence of DNA
Term
_________ codes for protein
Definition
exon
Term
codon
Definition
three-nucleotide sequence on messenger RNA
Term
_______ codes for single amino acid
Definition
codon
Term
translation
Definition
decoding of a mRNA message into a polypeptide chain
Term
anticodon
Definition
group of three bases on tRNA molecule that are complimentary to an mRNA codon
Term
mutation
Definition
change in a DNA sequence that affects genetic information
Term
point mutation
Definition
mutation that affects a single nucleotide, usually by substituting one nucleotide for another
Term
frameshift mutation
Definition
mutation that shifts the "reading" form of the gentic messages by inserting or deleting a nuclotide
Term
operon
Definition
group of genes operating together
Term
operator
Definition
region of chromosome in an operon to which the repressor binds when the operon is "turned off"
Term
hox genes
Definition
series of genes that controls the organs and tissues that develop various parts of an embryo
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