MMSC490 LATEST 2026 PRACTICE TEST QUESTIONS AND
SOLUTIONS GUARANTEE A+
✔✔Results of cesium chloride density gradient centrifugation on genomic DNA often
reveal relatively small peaks of DNA that separate from the main genomic DNA peak
and consist of 1,000s of short repetitive sequences referred to as
a. long interspersed elements
b. satellite DNA
c. short interspersed elements
d. transposable elements - ✔✔b. satellite DNA
✔✔Extensive digestion of chromatin with micrococcal nuclease was found to yield
particles called nucleosome core particles that appear as beads when viewed by
electron microscopy. Which of the following is not found in the nucleosome core
particle?
a. Two molecules of H4 protein
b. Two molecules of of H2A protein
c. Two molecules of H3 protein
d. One molecule of H1 protein - ✔✔d. One molecule of H1 protein
✔✔Pseudogenes are
a. nonfunctional gene copies
b. inactive genes
c. genes containing variant sequences
d. genes that code for an RNA but do not code for a protein - ✔✔a. nonfunctional gene
copies
✔✔The human genome contains only 20,000 to 25,000 actual gene sequences, yet the
human genome can produce up to 100,000 gene products. Which of the following
processes accounts for this difference?
a. alternative splicing
b. spacer sequences
c. short interspersed elements (SINEs)
d. satellite DNA - ✔✔a. alternative splicing
✔✔Euchromatin consists of
a. decondensed, transcriptionally active chromatin
b. highly condensed, transcriptionally inactive chromatin
c. 10-nm chromatin fibers
d. DNA associated with nucleosomes - ✔✔a. decondensed, transcriptionally active
chromatin
✔✔If a human gene is found to contain five introns, the mature mRNA encoded by that
gene would have how many exons?
a. five exons
, b. four exons
c. six exons
d. there could be multiple mRNAs that contain between one and six introns - ✔✔d. there
could be multiple mRNAs that contain between one and six introns
✔✔Even though the complete genome is significantly smaller than humans, the
flowering plant Arabidopsis thaliana has about ............... genes, about the same number
as humans have.
a. 4,000
b. 100,000
c. 6,000
d. 26,000 - ✔✔d. 26,000
✔✔The chromosomes of prokaryotes differ from those of eukaryotes in that prokaryotic
chromosomes are
a. linear
b. circular
c. multiple
d. complexed with histones - ✔✔b. circular
✔✔Heterochromatin consists of
a. decondensed, transcriptionally active chromatin
b. 10-nm chromatin fibers
c. highly condensed, transcriptionally inactive chromatin
d. DNA associated with nucleosomes - ✔✔c. highly condensed, transcriptionally
inactive chromatin
✔✔Telomeres function to
a. all of the above
b. protect chromosome ends from degradation
c. provide a site for replication of chromosome ends
d. protect chromosome ends from joining - ✔✔a. all of the above
✔✔Centromeric DNA sequences were first identified by
a. selecting for sequences inserted into yeast plasmids that are distributed equally
among daughter cells during mitosis
b. isolating DNA sequences that bind to purified microtubules in vitro
c. isolating kinetochores from animal cells in culture
d. mutations that resulted in early chromosome separation during mitosis. - ✔✔a.
selecting for sequences inserted into yeast plasmids that are distributed equally among
daughter cells during mitosis
✔✔A gene can be defined as a segment of DNA that codes for
a. messenger RNA
b. messenger RNA or ribosomal RNA
SOLUTIONS GUARANTEE A+
✔✔Results of cesium chloride density gradient centrifugation on genomic DNA often
reveal relatively small peaks of DNA that separate from the main genomic DNA peak
and consist of 1,000s of short repetitive sequences referred to as
a. long interspersed elements
b. satellite DNA
c. short interspersed elements
d. transposable elements - ✔✔b. satellite DNA
✔✔Extensive digestion of chromatin with micrococcal nuclease was found to yield
particles called nucleosome core particles that appear as beads when viewed by
electron microscopy. Which of the following is not found in the nucleosome core
particle?
a. Two molecules of H4 protein
b. Two molecules of of H2A protein
c. Two molecules of H3 protein
d. One molecule of H1 protein - ✔✔d. One molecule of H1 protein
✔✔Pseudogenes are
a. nonfunctional gene copies
b. inactive genes
c. genes containing variant sequences
d. genes that code for an RNA but do not code for a protein - ✔✔a. nonfunctional gene
copies
✔✔The human genome contains only 20,000 to 25,000 actual gene sequences, yet the
human genome can produce up to 100,000 gene products. Which of the following
processes accounts for this difference?
a. alternative splicing
b. spacer sequences
c. short interspersed elements (SINEs)
d. satellite DNA - ✔✔a. alternative splicing
✔✔Euchromatin consists of
a. decondensed, transcriptionally active chromatin
b. highly condensed, transcriptionally inactive chromatin
c. 10-nm chromatin fibers
d. DNA associated with nucleosomes - ✔✔a. decondensed, transcriptionally active
chromatin
✔✔If a human gene is found to contain five introns, the mature mRNA encoded by that
gene would have how many exons?
a. five exons
, b. four exons
c. six exons
d. there could be multiple mRNAs that contain between one and six introns - ✔✔d. there
could be multiple mRNAs that contain between one and six introns
✔✔Even though the complete genome is significantly smaller than humans, the
flowering plant Arabidopsis thaliana has about ............... genes, about the same number
as humans have.
a. 4,000
b. 100,000
c. 6,000
d. 26,000 - ✔✔d. 26,000
✔✔The chromosomes of prokaryotes differ from those of eukaryotes in that prokaryotic
chromosomes are
a. linear
b. circular
c. multiple
d. complexed with histones - ✔✔b. circular
✔✔Heterochromatin consists of
a. decondensed, transcriptionally active chromatin
b. 10-nm chromatin fibers
c. highly condensed, transcriptionally inactive chromatin
d. DNA associated with nucleosomes - ✔✔c. highly condensed, transcriptionally
inactive chromatin
✔✔Telomeres function to
a. all of the above
b. protect chromosome ends from degradation
c. provide a site for replication of chromosome ends
d. protect chromosome ends from joining - ✔✔a. all of the above
✔✔Centromeric DNA sequences were first identified by
a. selecting for sequences inserted into yeast plasmids that are distributed equally
among daughter cells during mitosis
b. isolating DNA sequences that bind to purified microtubules in vitro
c. isolating kinetochores from animal cells in culture
d. mutations that resulted in early chromosome separation during mitosis. - ✔✔a.
selecting for sequences inserted into yeast plasmids that are distributed equally among
daughter cells during mitosis
✔✔A gene can be defined as a segment of DNA that codes for
a. messenger RNA
b. messenger RNA or ribosomal RNA
