MICROBIO 303 Exam questions and
answers graded A+
Eukaryotic cells differ from prokaryotic cells in that
A. prokaryotes do not have DNA.
B. only eukaryotes have a true nucleus.
C. only eukaryotic cells contain genetic material.
D. eukaryotes are usually smaller than prokaryotes. - ANS✅✅B. only eukaryotes have a true
nucleus.
An allele is
A. a type of cell.
B. the very same thing as a dominant trait.
C. an imaginary concept.
D. none of the above. - ANS✅✅D. none of the above.
3. If two chromosomes of a species are the same length and have similar centromere placement but
are not homologous, then
A. one chromosome might be metacentric while the other one might be acrocentic
B. the chromosomes do not contain the same set of genes
C. one must be maternally inherited while the other is paternally inherited D. all of the above -
ANS✅✅B. the chromosomes do not contain the same set of genes
The stage in the eukaryotic cell cycle when chromosomes are replicated is known as
A. S phase
B. G1 phase
C. the checkpoint
D. mitosis - ANS✅✅A. S phase
Karyotypes are made using chromosomes at which stage of mitosis?
A. None. Karyotypes are typically done on cells in meiosis.
B. Telophase
, C. Metaphase
D. Prophase - ANS✅✅C. Metaphase
6. If a typical diploid somatic cell of an organism has 32 pairs of chromosomes, what is the total
number of "p" chromosome arms in the G1 phase of the cell cycle?
A. 32
B. 64
C. 128
D. 256 - ANS✅✅B. 64
During spermatogenesis in an animal species, one tetrad undergoes nondisjunction during the first
meiotic division. Following the second meiotic division, how many of the four gametes produced
should contain an abnormal number of chromosomes?
A. 1
B. 2
C. 3
D. 4 - ANS✅✅D. 4
The synaptonemal complex
A. contains nonhomologous chromosomes
B. forms during prophase I of meiosis
C. forms during prophase II of meiosis
D. forms during mitosis. - ANS✅✅B. forms during prophase I of meiosis
For an organism of genotype Aa, each somatic cell contains both the "A" allele and the "a" allele, but
half of the organism's gametes contain only the "A" allele and the other half contain only the "a"
allele. This is essentially Mendel's principle of
A. segregation
B. dominance
C. independent assortment
D. homology - ANS✅✅A. segregation
answers graded A+
Eukaryotic cells differ from prokaryotic cells in that
A. prokaryotes do not have DNA.
B. only eukaryotes have a true nucleus.
C. only eukaryotic cells contain genetic material.
D. eukaryotes are usually smaller than prokaryotes. - ANS✅✅B. only eukaryotes have a true
nucleus.
An allele is
A. a type of cell.
B. the very same thing as a dominant trait.
C. an imaginary concept.
D. none of the above. - ANS✅✅D. none of the above.
3. If two chromosomes of a species are the same length and have similar centromere placement but
are not homologous, then
A. one chromosome might be metacentric while the other one might be acrocentic
B. the chromosomes do not contain the same set of genes
C. one must be maternally inherited while the other is paternally inherited D. all of the above -
ANS✅✅B. the chromosomes do not contain the same set of genes
The stage in the eukaryotic cell cycle when chromosomes are replicated is known as
A. S phase
B. G1 phase
C. the checkpoint
D. mitosis - ANS✅✅A. S phase
Karyotypes are made using chromosomes at which stage of mitosis?
A. None. Karyotypes are typically done on cells in meiosis.
B. Telophase
, C. Metaphase
D. Prophase - ANS✅✅C. Metaphase
6. If a typical diploid somatic cell of an organism has 32 pairs of chromosomes, what is the total
number of "p" chromosome arms in the G1 phase of the cell cycle?
A. 32
B. 64
C. 128
D. 256 - ANS✅✅B. 64
During spermatogenesis in an animal species, one tetrad undergoes nondisjunction during the first
meiotic division. Following the second meiotic division, how many of the four gametes produced
should contain an abnormal number of chromosomes?
A. 1
B. 2
C. 3
D. 4 - ANS✅✅D. 4
The synaptonemal complex
A. contains nonhomologous chromosomes
B. forms during prophase I of meiosis
C. forms during prophase II of meiosis
D. forms during mitosis. - ANS✅✅B. forms during prophase I of meiosis
For an organism of genotype Aa, each somatic cell contains both the "A" allele and the "a" allele, but
half of the organism's gametes contain only the "A" allele and the other half contain only the "a"
allele. This is essentially Mendel's principle of
A. segregation
B. dominance
C. independent assortment
D. homology - ANS✅✅A. segregation
