, Which of the following statements describes the process of transformation in bacteria? -
CORRECT ANSWERS-External DNA is taken into a cell, becoming part of the cells
genome.
In his transformation experiments what phenomenon did Griffith observe? - CORRECT
ANSWERS-Mixing a heat-Killed pathogenic strain of bacteria with a living non-
pathogenic strain can convert some of the living cells into pathogenic form.
a heat-killed, phosphorescent (light-emitting) strain of bacteria is mixed with a living,
non-phosphorescent strain. Further observation of the mixture show that some of the
living cells are now phosphorescent. Which of the following observations would provide
the best evidence that the ability to phosphorescent is a heritable trait? - CORRECT
ANSWERS-Phosphorescence in descendants of the living cells.
Which of the following facts did Hershey & Chase make use of in trying to determine
whether DNA or protein is the genetic material? - CORRECT ANSWERS-DNA contains
phosphorus, whereas protein does not.
which of the following investigators was (were) responsible for the discovery that in DNA
from any species, the amount of thymine, and the amount guanine equals the amount of
cytosine? - CORRECT ANSWERS-Erwin Chargaff
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be thymine? -
CORRECT ANSWERS-8%
Thymine makes up 28% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be guanine? -
CORRECT ANSWERS-22%
It became apparent to Watson & Crick after completion of their model that the DNA
molecule could carry a vast amount of hereditary information. Which of the following
characteristics of DNA is responsible for this? - CORRECT ANSWERS-Sequence of
Bases
In an analysis of the nucleotide composition of a molecule of DNA, which of the
following combinations of base pairs will be found? - CORRECT ANSWERS-A + C = G
+T
For a science fair project, 2 students decided to repeat Hershey & Chase experiment,
with modifications. They decided o radioactively label the nitrogen of the DNA, rather
than the phosphate and two to five nitrogen atoms. Thus, labeling the nitrogen atoms
would provide a stronger signal than labeling the phosphates. why wont this experiment
works? - CORRECT ANSWERS-Amino Acids (and thus proteins) also have nitrogen
atoms; thus, the radioactivity would not distinguish between DNA & proteins.
CORRECT ANSWERS-External DNA is taken into a cell, becoming part of the cells
genome.
In his transformation experiments what phenomenon did Griffith observe? - CORRECT
ANSWERS-Mixing a heat-Killed pathogenic strain of bacteria with a living non-
pathogenic strain can convert some of the living cells into pathogenic form.
a heat-killed, phosphorescent (light-emitting) strain of bacteria is mixed with a living,
non-phosphorescent strain. Further observation of the mixture show that some of the
living cells are now phosphorescent. Which of the following observations would provide
the best evidence that the ability to phosphorescent is a heritable trait? - CORRECT
ANSWERS-Phosphorescence in descendants of the living cells.
Which of the following facts did Hershey & Chase make use of in trying to determine
whether DNA or protein is the genetic material? - CORRECT ANSWERS-DNA contains
phosphorus, whereas protein does not.
which of the following investigators was (were) responsible for the discovery that in DNA
from any species, the amount of thymine, and the amount guanine equals the amount of
cytosine? - CORRECT ANSWERS-Erwin Chargaff
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be thymine? -
CORRECT ANSWERS-8%
Thymine makes up 28% of the nucleotides in a sample of DNA from an organism.
Approximately what percentage of the nucleotides in this sample will be guanine? -
CORRECT ANSWERS-22%
It became apparent to Watson & Crick after completion of their model that the DNA
molecule could carry a vast amount of hereditary information. Which of the following
characteristics of DNA is responsible for this? - CORRECT ANSWERS-Sequence of
Bases
In an analysis of the nucleotide composition of a molecule of DNA, which of the
following combinations of base pairs will be found? - CORRECT ANSWERS-A + C = G
+T
For a science fair project, 2 students decided to repeat Hershey & Chase experiment,
with modifications. They decided o radioactively label the nitrogen of the DNA, rather
than the phosphate and two to five nitrogen atoms. Thus, labeling the nitrogen atoms
would provide a stronger signal than labeling the phosphates. why wont this experiment
works? - CORRECT ANSWERS-Amino Acids (and thus proteins) also have nitrogen
atoms; thus, the radioactivity would not distinguish between DNA & proteins.
