7553994
Descripción
Test por Stefania Schoen, actualizado hace más de 1 año
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Creado por Stefania Schoen
hace casi 8 años
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Pregunta 1
Pregunta
By observing bacterial transformation, Avery and other scientists discovered that the nucleic acid DNA stores and transmits genetic information from one generation of bacteria to the next.
Respuesta
- True
- False
Pregunta 2
Pregunta
Hershey and Chase's experiment with bacteriophages confirmed Avery's results, convincing many scientists that DNA was the genetic material found in genes-not just in viruses and bacteria, but in all living cells.
Respuesta
- True
- False
Pregunta 3
Pregunta
The DNA that makes up genes must be capable of storing, copying, and transforming the genetic information in a cell.
Respuesta
- True
- False
Pregunta 4
Pregunta
DNA is a nucleic acid made up of amino acids joined into long strands or chains by covalent bonds
Respuesta
- True
- False
Pregunta 5
Pregunta
The clues in Franklin's X-ray pattern enabled Watson and Crick to build a model that explained the specific structure and properties of DNA.
Respuesta
- True
- False
Pregunta 6
Pregunta
The double-helix model explains Chargaff's rule of base pairing and how the two strands of DNA are held together.
Respuesta
- True
- False
Pregunta 7
Pregunta
DNA poly merase is an enzyme that joins individual nucleotides to produce a new strand of DNA.
Respuesta
- True
- False
Pregunta 8
Pregunta
Replication in most prokaryotic cells starts from a single point and proceeds in two directions until the entire chromosome is copied.
Respuesta
- True
- False
Pregunta 9
Pregunta
In prokaryotic cells, replication may begin at dozens or even hundreds of places on the DNA molecule, proceeding in both directions until each chromosome is completely copied.
Respuesta
- True
- False
Pregunta 10
Pregunta
The process by which one strain of bacterium is changed into another strain is called
Respuesta
-
transcription
-
transformation
-
duplication
-
replication
Pregunta 11
Pregunta
Bacteriophages are
Respuesta
-
a form of bacteria.
-
enzymes.
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coils of DNA.
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viruses.
Pregunta 12
Pregunta
Which of the following researchers used radioactive markers in experiments to show that DNA was the genetic material in cells?
Respuesta
-
Frederick Griffith
-
Oswald Avery
-
Alfred Hershey and Martha Chase
-
James Watson and Francis Crick
Pregunta 13
Pregunta
Before DNA could definitively be shown to be the genetic material in cells, scientists had to show that it could
Respuesta
-
tolerate high temperatures.
-
carry and make copies of information.
-
be modified in response to environmental conditions.
-
be broken down into small subunits.
Pregunta 14
Pregunta
A nucleotide does NOT contain
Respuesta
-
a 5-carbon sugar.
-
an amino acid.
-
a nitrogen base.
-
a phosphate group.
Pregunta 15
Pregunta
According to Chargaff's rule of base pairing, which of the following is true about DNA?
Respuesta
-
A=T and C=G
-
A-C and T=G
-
A=G and T=C
-
A=T=C=G
Pregunta 16
Pregunta
The bonds that hold the two strands of DNA together come from
Respuesta
-
the attraction of phosphate groups for each other.
-
strong bonds between nitrogenous bases and the sugar-phosphate backbone.
-
weak hydrogen bonds between nitrogenous bases.
-
carbon-to-barbon bonds in the sugar portion of the nucleotides.
Pregunta 17
Pregunta
In Prokaryotes, DNA molecules are located in the
Respuesta
-
nucleus.
-
ribosomes.
-
cytoplasm.
-
histones.
Pregunta 18
Pregunta
In eukaryotes, nearly all the DNA is found in the
Respuesta
-
nucleus.
-
ribosomes.
-
cytoplasm.
-
histones.
Pregunta 19
Pregunta
The main enzyme involved in linking individual nucleotides into DNA molecules is
Respuesta
-
DNA protease.
-
ribose.
-
carbohydrase.
-
DNA polymerase.
Pregunta 20
Pregunta
During replication, which sequence of nucleotides would bond with the DNA sequence TATGA?
Respuesta
-
TATGA
-
ATACT
-
CACTA
-
AGTAT
Pregunta 21
Pregunta
The scientist(s) responsible for the discovery of bacterial transformation is (are)
Respuesta
-
Watson and Crick.
-
Griffith.
-
Avery.
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Franklin.
Pregunta 22
Pregunta
Which of the following does NOT describe the structure of DNA?
Respuesta
-
double helix
-
nucleotide polymer
-
contains adenine-quanine pairs
-
sugar-phosphate backbone
Pregunta 23
Pregunta
What did Hershey and Chase's work show?
Respuesta
-
Genes are probably made of DNA
-
Genes are probably made of protein.
-
Viruses contain DNA but not protein.
-
Bacteria contain DNA but not protein.
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