2380175
Descripción
Test por Shirley Zhu, actualizado hace más de 1 año
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Creado por Shirley Zhu
hace más de 9 años
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Pregunta 1
Pregunta
Which of the following scientists is responsible for figuring out that transformation is possible but the transforming factor is unknown?
Respuesta
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Avery
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Chargaff
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Griffith
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Melson and Stahl
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Hershey and Chase
Pregunta 2
Pregunta
Which of the following scientists is responsible for culturing E. Coli in 15N and then 14N to show that DNA replication is semiconservative?
Respuesta
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Avery
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Chargaff
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Griffith
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Meselson and Stahl
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Hershey and Chase
Pregunta 3
Pregunta
Which of the following scientists found that nucleic acid, not protein is the genetic material of the T2 bacteriophage?
Respuesta
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Avery
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Chargaff
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Griffith
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Meleson and Stahl
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Hershey and Chase
Pregunta 4
Pregunta
Which of the following scientists discovered that when nucleases are added to the transformation reaction, transformation does not occur?
Respuesta
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Avery
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Chargaff
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Griffith
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Meselson and Stahl
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Hershey and Chase
Pregunta 5
Pregunta
Which of the following scientists figured out that the percent composition of G equals the percent composition of C in DNA?
Respuesta
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Avery
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Chargaff
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Griffith
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Meselson and Stahl
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Hershey and Chase
Pregunta 6
Pregunta
Which of the following is a double-stranded molecule that is passed from one generation to the next?
Respuesta
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mRNA
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DNA
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tRNA
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RNA polymerase
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ribosome
Pregunta 7
Pregunta
Which of the following is a protein that synthesizes RNA?
Respuesta
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mRNA
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DNA
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tRNA
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RNA polymerase
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ribosome
Pregunta 8
Pregunta
Which of the following contains codons?
Respuesta
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mRNA
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DNA
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tRNA
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RNA polymerase
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ribosome
Pregunta 9
Pregunta
Which of the following contains anticodons?
Respuesta
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mRNA
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DNA
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tRNA
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RNA polymerase
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ribosome
Pregunta 10
Pregunta
Which of the following is made of two subunits, each composed of protein and RNA
Respuesta
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mRNA
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DNA
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tRNA
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RNA polyermase
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ribosome
Pregunta 11
Pregunta
Which of the following attaches to an amino acid on its 3' end?
Respuesta
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mRNA
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DNA
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tRNA
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RNA polymerase
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ribosome
Pregunta 12
Pregunta
What is another word for each newly synthesized DNA molecule contains a template strand and a new strand?
Respuesta
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DNA polymerase
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RNA polymerase
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Semiconservative replication
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Antiparallel
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Ribosome
Pregunta 13
Pregunta
Which of the following is a part of translation?
Respuesta
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DNA polymerase
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RNA polymerase
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Semiconservative replication
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Antiparallel
-
Ribosome
Pregunta 14
Pregunta
Which of the following is a part of transcription?
Respuesta
-
DNA polymerase
-
RNA polymerase
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Semiconservative
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Antiparallel
-
Ribosome
Pregunta 15
Pregunta
Which of the following is a replication and proofreading enzyme?
Respuesta
-
DNA polymerase
-
RNA polymerase
-
Semiconservative replication
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Antiparallel
-
Ribosome
Pregunta 16
Pregunta
Which of the following is most active during S phase of interphase?
Respuesta
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DNA polymerase
-
RNA polymerase
-
Semiconservative replication
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Antiparallel
-
Ribosome
Pregunta 17
Pregunta
What is the name of the fact that the 5' end of one strand is hydrogen-bonded to the 3' end of the complimentary strand?
Respuesta
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DNA polymerase
-
RNA polymerase
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Semiconservative replication
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Antiparallel
-
Ribosome
Pregunta 18
Pregunta
Which of the following typically occurs only before cell division?
Respuesta
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DNA synthesis
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Transcription
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Translation
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Reverse transcription
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Posttranscriptional processing
Pregunta 19
Pregunta
What is the name of the process in which polypeptides are assembled at ribosomes?
Respuesta
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DNA synthesis
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Transcription
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Translation
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Reverse transcription
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Posttranscriptional processing
Pregunta 20
Pregunta
What is the process by which a strand of DNA is made complimentary to an RNA molecule?
Respuesta
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DNA synthesis
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Transcription
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Translation
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Reverse transcription
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Posttranscriptional processing
Pregunta 21
Pregunta
Which of the following involves splicing out introns?
Respuesta
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DNA synthesis
-
Transcription
-
Translation
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Reverse transcription
-
Posttranscriptional processing
Pregunta 22
Pregunta
Which of the following processes begins at the origin of replication?
Respuesta
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DNA synthesis
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Trancription
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Translation
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Reverse transcription
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Posttranscriptional processing
Pregunta 23
Pregunta
In which of the processes is a 5' cap and a poly-A tail added to an RNA molecule?
Respuesta
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DNA synthesis
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Transcription
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Translation
-
Reverse transcription
-
Posttranscriptional processing
Pregunta 24
Pregunta
All of the following are mechanisms by which bacteria acquire genetic diversity EXCEPT
Respuesta
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Mutation
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Binary fission
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Transformation
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Transduction
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Conjugation
Pregunta 25
Pregunta
If a known single-base substitution in a gene produces a nonfunctional enzyme, how can a scientist test for the presence of this mutation?
Respuesta
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Restriction enzymes can be used to test for gene mutations that introduce or eliminate restriction enzyme cleavage sites.
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A test of enzyme activity can be performed on purified enzyme.
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An electron microscope can be used to study the structure of the gene or of the protein.
Pregunta 26
Pregunta
DNA analysis of adult and developing frogs reveals that the same genes are present in all the cells of the frog throughout its development. However, certain proteins found in developing frogs are absent from adult frogs. Which of the following best explains this observation?
Respuesta
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Developmental genes are not expressed in adults.
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No genes expressed in adults are expressed in developing organisms.
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Proteins are not modified as an organism develops
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Proteins are greatly modified as an organism develops
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Most genes in cells are never expressed.
Pregunta 27
Pregunta
All of the following are true regarding gene expression EXCEPT
Respuesta
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All DNA-containing cells in a particular organism have basically the same genes.
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Different cell types contain different proteins.
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A particular cell makes the exact-same proteins for its entire lifespan.
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Promoters are regions of DNA that help regulate gene expression.
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In eukaryotes, each gene has its own promoter.
Pregunta 28
Pregunta
A nucleus was removed from a fibroblast cell of an adult mouse (mouse 1). The nucleus was then inserted into an egg cell from which the nucleus was removed (the egg cell was from a different mouse, 2). The resulting diploid cell began to divide, and the young embryo was implanted into the uterus of a third mouse and allowed to develop. The third mouse eventually gave birth to a healthy mouse (mouse 4). Which of the following correctly identifies the procedures described above?
Respuesta
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DNA sequencing
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Nuclear transplantation (cloning)
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Embryology
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Sexual reproduction
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Nuclear fission
Pregunta 29
Pregunta
Referring to question 28, the phenotype of the young mouse (mouse 4) is expected to be
Respuesta
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practically identical to the adult mouse from which the nucleus was taken (mouse 1).
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practically identical to the mouse who donated the egg (mouse 2).
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similar to the mouse who donated the egg (mouse 2).
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a combination of the nuclear and egg donor mice (mice 1 and 2).
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the same as the mouse in which it developed (mouse 3).
Pregunta 30
Pregunta
A cloned animal may exhibit traits that are not present in the animal from which it was cloned (the nucleus donor). Which of the following best explains this observation?
Respuesta
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The egg donor, not the nucleus donor, determines the phenotype of the clone.
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Usually, but not always, the nucleus donor determines the phenotype of the offspring.
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The egg into which the nucleus was transferred contained extra-nuclear genes.
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The cloned animal only expresses the genes of the egg donor.
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The genes of the nucleus donor were not properly expressed in the offspring.
Pregunta 31
Pregunta
DNA from a specific organism is determined to contain 20 percent cytosine. Which of the following can be concluded about the DNA of this organism?
Respuesta
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It contains 30 percent G.
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It contains 80 percent G.
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It contains 40 percent A and 40 percent T.
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It contains 20 percent T and 20 percent A
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It contains 30 percent T and 30 percent A
Pregunta 32
Pregunta
A yeast cell can be used to express and animal gene. Which of the following best explains why this is possible?
Respuesta
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Yeast and animals have mostly the same genes.
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Yeast and animals are both eukaryotes.
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The genetic code is universal.
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DNA replication is similar in yeast and animals.
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Yeast and animals share a recent common ancestor.
Pregunta 33
Pregunta
Which of the following statements correctly describes mutations?
Respuesta
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They are harmful to the organism but good for the species.
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They are irreversible.
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They are only useful when they occur in germ cells.
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They are a source of variation.
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They drive evolution by creating selective pressures.
Pregunta 34
Pregunta
Which of the following statements is true concerning genes?
Respuesta
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Genes exist in alternate forms called introns and extrons.
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A gene can code for a polypeptide.
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Genes can cross over during mitosis.
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Recessive alleles are never expressed.
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Genes make up the majority of nucleotide sequences in the human genome.
Pregunta 35
Pregunta
All of the following statements regarding nucleic acids are true EXCEPT
Respuesta
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Nucleotides consist of a five-carbon sugar, a nitrogenous base and a phosphate.
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Nucleic acids are only synthesized from the 5' --> 3' direction.
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The nitrogenous bases of both DNA and RNA include adenine and guanine.
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RNA does not contain uracil.
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Complementary base pairs of the same (in single-stranded) or different (in double-stranded) nucleic acid strands can hydrogen-bond to each other.
Pregunta 36
Pregunta
Which of the following statements about DNA replication is true?
Respuesta
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DNA replication begins at the promoter.
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The leading strand of DNA synthesis contains Okazaki fragments.
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Hydrogen bonds must be broken in order to replicate DNA.
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Bacteria have more DNA than eukaryotes, and so they take longer to replicate their DNA.
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DNA ligase is necessary to build primers on lagging strands during replication.
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