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Biology Chapter 9 Extra Credit
Terms in this set (33)
Bacterial enzymes that cut the DNA viruses are called
Which technique is used to separate DNA fragments by their size?
Suppose a segment of DNA contains 5 restriction sites for a particular restriction enzyme. How many fragments of DNA will remain after the enzyme is used to cut the DNA?
Some restriction enzymes leave behind "sticky ends," or tails of
What do the bands on a restriction map show?
sizes of DNA
What is a true statement about polymerase chain reaction (PCR)?
requires primers and nucleotides
The first step of PCR is to heat a DNA molecule to more the 90ºC. What is the function of this step?
To separate the DNA strands
The main role of primers during the PCR process is to
provide a starting point for DNA synthesis
During each PCR cycle, what happens to the number of copies of a DNA segment?
Scientists use PCR primarily to
Which phase is true for a DNA fingerprint?
It is a type of restriction map
What is the basis for the molecular differences identified by DNA fingerprinting?
regions of noncoding DNA
DNA fingerprinting can be used to
prove a family relationship
What is an example of clones?
identical twin sisters
DNA that contains genes from more than one organism is called
What is a true statement of all genetically engineered organisms?
they have altered genomes
Plants that contain recombinant DNA are called
The two main goals of the Human Genome Project are to sequence all of the DNA base pairs of the human chromosomes and to
identify all the genes within the genome
Gene sequencing defines the order of
DNA nucleotides in genes or genomes
The study of the proteins that result from an organisms genome is called
the main purpose of genetic screening is to
assess the risk of having or carrying a genetic disorder
the goal of gene therapy is to replace defective or missing genes in order to
treat some genetic disorders
genetic engineering is possible because all organisms are based on the same
what is a clone?
a genetically identical copy of a gene or organism
which of the following technologies uses electricity to sort DNA fragments based on their sizes?
what process could a scientist use to make an amount of DNA that is large enough to study?
polymerase chain reaction
The restriction enzymes used by scientists to cut DNA molecules at specific nucleotide sequences come from
Which of the following experimental techniques involves treating a genetic disorder by replacing a defective gene with a functional gene?
The purpose of genetic engineering is to
give organisms new traits
How does gel electrophoresis separate DNA fragments?
according to size
What is a benefit of genetic engineering of plants?
enhanced disease resistance in crops
One approachto gene therapy is to remove some of the patient's bone marrow stem cells and infect them with a virus that contains a functional gene. The stem cells are put back into the patient's bone marrow so that they can
divide and make more blood cells with the functional gene
During gel elctrophoresis, DNA fragments always more from ______ pole to ______ pole.
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