11751018
Descripción
Test por Christina Marshall, actualizado hace más de 1 año
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Creado por Christina Marshall
hace casi 7 años
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Pregunta 1
Pregunta
Why did researchers initially believe the genetic material was protein?
Respuesta
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Proteins are more biologically complex than DNA
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Proteins are found only in the nucleus, bu DNA is found in many areas of the cell
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Proteins are much larger molecules and can store more information than DNA
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all of the above
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both a and c
Pregunta 2
Pregunta
Considering the components of a nucleotide, what component is always different when comparing nucleotides in a DNA strand and in an RNA strand?
Respuesta
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Phosphate Group
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Pentose Sugar
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Nitrogenous Base
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both b and c
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a, b, and c
Pregunta 3
Pregunta
Which of the following equations id appropriate when considering DNA base composition?
Respuesta
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%A+%T=%G+%C
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%A=%G
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%A=%G=%T=%C
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%A + %G = %T + %C
Pregunta 4
Pregunta
If the sequence of a segment of DNA is 5'-CGCAACTAC-3', what is the appropriate sequence for the opposite strand?
Respuesta
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5'- GCGTTGATG-3'
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3'-ATACCAGCA-5'
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5'-ATACCAGCA-3'
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3'-GCGTTGATG-5'
Pregunta 5
Pregunta
Of the following statements, which is correct when considering the process of DNA replication?
Respuesta
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New DNA molecules are composed of two completely new strands
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New DNA molecules are composed of one strand from the old molecule and one new strand
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New DNA molecules are composed of strands that area mixture of sections from the old molecule and sections from that are new.
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non of the above
Pregunta 6
Pregunta
Meselson and Stahl were able to demonstrate semiconservative replication of E. Coli by
Respuesta
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using radioactive isotopes of phosphorus to label the old strand and visually determining the relationship of old and new DNA strands.
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using different enzymes to eliminate old strands from DNA
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using isotopes of nitrogen to label the DNA strands by density differences of the new molecules
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labeling viral DNA before it was incorporated into a bacterial cell and visually determining the location of the DNA after centrifugation.
Pregunta 7
Pregunta
During replication of a DNA molecule, the daughter strands are not produced in exactly the same manner. One strand, the leading strand, is made toward the replication fork, while the lagging strands is made in fragments in the opposite direction. This difference in the synthesis of the two strands is the result of which of the following?
Respuesta
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DNA polymerase is not fast enough to make two leading strands of DNA
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The two template strands are antiparallel, and DNA polymerase makes DNA only in the 5' to 3' direction.
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The lagging strand is the result of DNA breakage due to UV light.
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The cell does not contain enough nucleotides to make two complete strands.
Pregunta 8
Pregunta
In eukaryotic cells, chromosomes consist of
Respuesta
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DNA and RNA
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DNA only
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RNA and proteins
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DNA and proteins
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RNA only
Pregunta 9
Pregunta
A nucleosome is
Respuesta
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a dark-staining body composed of RNA and proteins found in the nucleus.
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a protein that helps organize the structure of chromosomes
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another word for chromosome
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a structure composed of DNA wrapped around eight histones
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the short arm of a chromosome
Pregunta 10
Pregunta
The conversion of euchromatin into heterochromatin involves
Respuesta
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the formation of more nucleosomes
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the formation of less nucleosomes
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a greater compaction of loop domains
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a lesser compaction of loop domains
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both a and c
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