BIO 101 EXAM 3 ASSESSMENT 2026 FULL
QUESTIONS AND CORRECT ANSWERS
GRADED A+
◉ Refer to the life cycles illustrated in the figure. Which of the life
cycles is (are) typical for most fungi and some protists?
Answer: II only
◉ Which of the following lists of structures correctly represents the
order of increasingly higher levels of organization of chromatin?
Answer: nucleosome, 30-nm chromatin fiber, looped domain
◉ Sturtevant provided genetic evidence for the existence of four
pairs of chromosomes in Drosophila in which of these ways?
Answer: Drosophila genes cluster into four distinct groups of linked
genes.
◉ Why do histones bind tightly to DNA?
Answer: Histones are positively charged, and DNA is negatively
charged.
,◉ During DNA replication, which of the following enzymes
covalently connects segments of DNA?
Answer: ligase
◉ You have isolated DNA from three different cell types of an
organism, determined the relative DNA content for each type, and
plotted the results on the graph shown in the figure.
Which sample(s) might represent a zygote?
Answer: I
◉ Which of the following statements describes the major reason
that the individual with the genotype AaBbCCDdEE can make many
kinds of gametes?
Answer: different possible assortment of chromosomes into gametes
◉ One map unit is equivalent to which of the following values?
Answer: 1% frequency of recombination between two genes
◉ In his transformation experiments, what did Griffith observe?
Answer: Mixing a heat-killed pathogenic strain of bacteria with a
living nonpathogenic strain can convert some of the living cells into
the pathogenic form.
,◉ If there are 20 centromeres in a cell at anaphase of mitosis, how
many chromosomes are there in each daughter cell following
cytokinesis?
Answer: 10
◉ In E. coli, there is a mutation in a gene called dnaB that alters the
helicase that normally acts at the origin. Which of the following
would you expect as a result of this mutation?
Answer: The DNA strands at the origin of replication will separate,
but replication will not progress.
◉ In the late 1950s, Meselson and Stahl grew bacteria in a medium
containing "heavy" nitrogen (15N) and then transferred them to a
medium containing 14N. Which of the results in the figure would be
expected after one round of DNA replication in the presence of 14N?
Answer: D
◉ What is a syndrome?
Answer: a group of traits typically found in conjunction with a
particular chromosomal aberration or gene mutation
◉ Which of the following types of cells would be produced by
meiosis?
Answer: a haploid animal cell
, ◉ After mixing a heat-killed, phosphorescent (light-emitting) strain
of bacteria with a living, nonphosphorescent strain, you discover
that some of the living cells are now phosphorescent. Which
observation(s) would provide the best evidence that the ability to
phosphoresce is a heritable trait?
Answer: Descendants of the living cells are also phosphorescent.
◉ Black fur in mice (B) is dominant to brown fur (b). Short tails (T)
are dominant to long tails (t). What fraction of the progeny of
crosses BbTt × BBtt will be expected to have black fur and long tails?
Answer: 1/2
◉ Researchers began a study of a cultured cell line. Their
preliminary observations showed them that the cell line did not
exhibit either density-dependent inhibition or anchorage
dependence. What could they conclude right away?
Answer: The cells show characteristics of tumors.
◉ During which process does the independent assortment of
chromosomes occur?
Answer: during meiosis I only
QUESTIONS AND CORRECT ANSWERS
GRADED A+
◉ Refer to the life cycles illustrated in the figure. Which of the life
cycles is (are) typical for most fungi and some protists?
Answer: II only
◉ Which of the following lists of structures correctly represents the
order of increasingly higher levels of organization of chromatin?
Answer: nucleosome, 30-nm chromatin fiber, looped domain
◉ Sturtevant provided genetic evidence for the existence of four
pairs of chromosomes in Drosophila in which of these ways?
Answer: Drosophila genes cluster into four distinct groups of linked
genes.
◉ Why do histones bind tightly to DNA?
Answer: Histones are positively charged, and DNA is negatively
charged.
,◉ During DNA replication, which of the following enzymes
covalently connects segments of DNA?
Answer: ligase
◉ You have isolated DNA from three different cell types of an
organism, determined the relative DNA content for each type, and
plotted the results on the graph shown in the figure.
Which sample(s) might represent a zygote?
Answer: I
◉ Which of the following statements describes the major reason
that the individual with the genotype AaBbCCDdEE can make many
kinds of gametes?
Answer: different possible assortment of chromosomes into gametes
◉ One map unit is equivalent to which of the following values?
Answer: 1% frequency of recombination between two genes
◉ In his transformation experiments, what did Griffith observe?
Answer: Mixing a heat-killed pathogenic strain of bacteria with a
living nonpathogenic strain can convert some of the living cells into
the pathogenic form.
,◉ If there are 20 centromeres in a cell at anaphase of mitosis, how
many chromosomes are there in each daughter cell following
cytokinesis?
Answer: 10
◉ In E. coli, there is a mutation in a gene called dnaB that alters the
helicase that normally acts at the origin. Which of the following
would you expect as a result of this mutation?
Answer: The DNA strands at the origin of replication will separate,
but replication will not progress.
◉ In the late 1950s, Meselson and Stahl grew bacteria in a medium
containing "heavy" nitrogen (15N) and then transferred them to a
medium containing 14N. Which of the results in the figure would be
expected after one round of DNA replication in the presence of 14N?
Answer: D
◉ What is a syndrome?
Answer: a group of traits typically found in conjunction with a
particular chromosomal aberration or gene mutation
◉ Which of the following types of cells would be produced by
meiosis?
Answer: a haploid animal cell
, ◉ After mixing a heat-killed, phosphorescent (light-emitting) strain
of bacteria with a living, nonphosphorescent strain, you discover
that some of the living cells are now phosphorescent. Which
observation(s) would provide the best evidence that the ability to
phosphoresce is a heritable trait?
Answer: Descendants of the living cells are also phosphorescent.
◉ Black fur in mice (B) is dominant to brown fur (b). Short tails (T)
are dominant to long tails (t). What fraction of the progeny of
crosses BbTt × BBtt will be expected to have black fur and long tails?
Answer: 1/2
◉ Researchers began a study of a cultured cell line. Their
preliminary observations showed them that the cell line did not
exhibit either density-dependent inhibition or anchorage
dependence. What could they conclude right away?
Answer: The cells show characteristics of tumors.
◉ During which process does the independent assortment of
chromosomes occur?
Answer: during meiosis I only
