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Exam 3 Biol 1030
Terms in this set (78)
Multiple origins of replication on the DNA molecules of eukaryotic cells serve to?
Shorten the time necessary for DNA replication,
The envelope of a mumps virus?
helps the virus enter the cell.
Which of the following features characterizes the lytic cycle of a viral infection?
The cycle typically leads to the lysis of the host cell.
When one DNA molecule is copied to make two DNA molecules the new DNA contains?
50% of the parent DNA.
The way that genetic material of a bacteriophage enters a bacterium is most like the way that?
a drug is injected with a hypodermic needle.
Which of the following statements regarding the structure of DNA is false?
The sequence of nucleotides along the length of a DNA strand is restricted by the base-pairing rules.
Consider the following sentence: "The dog did not eat." Which of the following variations of this sentence is most like a reading frame mutation?
The dod idn ote at.
In many bacteria genes that confer resistance to antibiotics are carried on?
Which of the following occurs when RNA polymerase attaches to the promoter DNA?
initiation of a new RNA molecule
In the 1920s Frederick Griffith conducted an experiment in which he mixed the dead cells of a bacterial strain that can cause pneumonia with live cells of a bacterial strain that cannot. When he cultured the live cells some of the daughter colonies proved able to cause pneumonia. Which of the following processes of bacterial DNA transfer does this experiment demonstrate?
We would expect that a 15-nucleotide sequence ending with a stop codon will direct the production of a polypeptide that consists of?
4 amino acids
HIV does the greatest damage to?
white blood cells.
Which of the following is not needed in order for translation to occur?
Which of the following is a function of a tRNA molecule?
joining to only one specific type of amino acid
Which of the following options most accurately lists the sequence of events in translation?
codon recognition peptide bond formation translocation termination
Which of the following statements about the treatment or prevention for a prion infection is true?
There is no known treatment or cure for prion infections.
Which of the following statements about eukaryotic RNA is true?
Exons are spliced together.
Which of the following people conducted the experiments that demonstrated that DNA is the genetic material of bacteriophages?
Hershey and Chase
How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?
The DNA molecule would have irregular widths along its length.
The cloning of Dolly the sheep?
demonstrated that the nuclei from differentiated mammalian cells can retain their full genetic potential
All of the following mechanisms are used to regulate protein production except?
Which of the following possible uses of reproductive cloning is still considered by most to be an unresolved ethical issue?
the reproductive cloning of humans
Which of the following statements regarding DNA packing is false?
DNA packing tends to promote gene expression
The relationship between DNA and chromosomes is most like?
thread wrapped around a spool
Which of the following statements regarding stem cells is false?
Adult but not embryonic, stem cells can be grown in laboratory culture.
In this drawing of the LAC operon which molecule is an inactive repressor?
Small pieces of RNA that can regulate translation of mRNA are called?
Which of the following mechanisms of controlling gene expression occurs outside of the nucleus?
When are DNA molecules the least tightly coiled?
S phase of interphase
Why can some plants be cloned from a single cell?
Plant cells can dedifferentiate and give rise to all of the specialized cells required to
Which structure in this figure shows one complete nucleosome?
The lac operon of E. coli is ________ when the repressor is bound to lactose?
A single cell the zygote can develop into an entirely new organism with many different specialized cells. Which of the following statements about this process is false?
Additional genetic information for the formation of specialized cells is passed on to the developing embryo via the placenta.
Which of the following statements about microarrays is false?
Microarrays use tiny portions of double-stranded RNA fragments from a large number of genes.
The term "gene expression" refers to the?
process by which genetic information flows from genes to proteins.
The expression of the tryptophan operon is controlled by?
a repressor that is active when it binds to tryptophan.
Adult stem cells have limited therapeutic potential?
because their developmental potential is limited to certain tissues.
Both prokaryotic and eukaryotic cells use ________ to turn certain genes on or off?
The coding regions of a gene (the portions that are expressed as polypeptide sequences) are called?
Which step in this process requires use of restriction enzymes?
A collection of DNA fragments obtained from the genome of one organism inserted by recombinant DNA techniques into the genome of a host organism (one fragment per host genome) and maintained there is called?
Why is the whole-genome shotgun method currently the tool of choice for analyzing genomes?
It is fast and inexpensive
When plasmids are used to produce a desired protein?
the desired gene is inserted into the plasmid and the plasmid is returned to the bacterium by transformation
cut DNA at specific sites
Which of the following statements regarding proteomics is correct?
Proteomics is the systematic study of the full set of proteins encoded by a genome.
The advantage of being able to clone the gene for human insulin is that?
human insulin is less likely to cause harmful side effects than cow pig or horse insulin.
In the process of human gene cloning using plasmids the bacterial plasmid?
functions as a vector
Gel electrophoresis sorts DNA molecules on the basis of their?
Which of the following statements about genomics is false?
DNA technology limits genomic studies to prokaryotes.
Which of the following statements about DNA technology is false?
DNA technology is now used to create cells that can identify and kill cancer cells.
Segments of eukaryotic DNA that can move or be copied from one site to another in the genome are called
What is the current standard tool used for DNA profiling by forensic scientists?
Genetically modifying ________ cells may directly affect future generations?
The type of recombinant bacteria most often used to mass-produce genes is?
Approximately what percentage of human DNA is noncoding?
"Sticky ends" are?
DNA fragments with single-stranded ends.
Golden rice is golden in color because it is rich in?
Approximately what percentage of the human genome is identical to that of a chimpanzee?
Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50% what is the probability that a couple's first-born child will be female and that their second-born child will be male?
According to this figure heterozygote's for this form of hypercholesterolemia suffer from the disease because they?
Don't produce enough LDL receptors
Genes located close together on the same chromosomes are referred to as ________ genes and generally ________?
linked . . . do not sort independently during meiosis
Which of the following is essentially the opposite of pleiotropy?
E. Polygenic inheritance
Varieties of plants in which self-fertilization produces offspring that are identical to the parents are referred to as?
The chromosome theory of inheritance states that?
The behavior of chromosomes during meiosis and fertilization accounts for patterns of inheritance
Which of the following statements regarding genetic testing is false?
Most human genetic diseases are treatable if caught early
A testcross is?
a mating between an individual of unknown genotype and an individual homozygous recessive fro the trait of interest
Crossing over _____ genes into assortments of _____ not found in the parents?
recombines linked .... alleles
What is meant by the statement that "male bees are fatherless"?
Male bees develop from unfertilized eggs
If A is dominant to a and B is dominant to b what is the expected phenotypic ratio of the cross: AaBb x AaBb?
Recessive X-linked traits are more likely to be expressed in a male fruit fly than a female fruit fly because?
the male's phenotype results entirely from his single X-linked gene
How many sex chromosomes are in a human gamete?
The individual features of all organisms are the result of?
genetics and the environment
Which of the following statements best represent the theory of pangenesis developed by Hippocrates?
Particles called pan genes which originate in each part of an organism's body collect in the sperm or eggs and are passed on to the next generation
The alleles of gene are found at ______ chromosomes?
the same locus on homologous
A person with AB blood illustrates the principal of?
Most people afflicted with recessive disorders are born to parents who were?
not affected at all by the disease
which plants in this figure must all be heterozygous?
purple-flowered plants in the f1 generation
Sex-linked conditions are more common in men than in women because?
men need to inherit only one copy of the recessive allele for the condition to be fully expressed
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