Page |1
MMSC490 Exam 2 Questions and Correct
Answers/ Latest Update / Already Graded
In the nucleus, introns are removed from transcripts by:
a. endonucleases.
b. restriction nucleases.
c. splicing.
d. exonucleases.
Ans: c. splicing
The DNA of eukaryotic cells is wrapped around histones to form
structures called
a. nuclear matrices
b. centromeres
c. nucleosomes
d. nucleoli
Ans: c. nucleosomes
Telomeres are
a. microtubule binding sites in the center of chromosomes.
b. sites at the ends of chromosomes where DNA replication begins.
All rights reserved © 2025/ 2026 |
, Page |2
c. sites at the ends of chromosomes where microtubules bind.
d. chromosome end structures required for complete replication of
linear chromosomes.
Ans: d. chromosome end structures required for complete
replication of linear chromosomes.
During mitosis, highly condensed chromosomes consist of two sister
chromatids joined at the
a. centromere
b. kinetechore
c. centrosome
d. spindle fiber
Ans: a. centromere
Introns constitute about what percentage of the average human gene?
a. 40%
b. 3%
c. 60%
d. 90%
Ans: d. 90%
All rights reserved © 2025/ 2026 |
, Page |3
introns are found
a. only in eukaryotic genes
b. commonly in eukaryotic genes and rarely in prokaryotic genes
c. commonly in both eukaryotic and prokaryotic genes
d. only in prokaryotic genes
Ans: b. commonly in eukaryotic genes and rarely in prokaryotic
genes.
Introns in mRNA-coding genes are the transcribed sequences
a. between protein-coding sequences
b. that code for proteins
c. that regulate mRNA translation
d. that are removed by nucleases
Ans: a. between protein-coding sequences.
Simple-sequence repeats
a. are present in tandem arrays of thousands of copies.
b. sediment as unique bands in equilibrium density-gradient
centrifugation.
All rights reserved © 2025/ 2026 |
, Page |4
c. re-associate more rapidly than non-repeated sequences.
d. All of the above
Ans: d. all of the above
Kinetochores are the
a. sites of spindle fiber attachment to chromosomes.
b. same as centromeres.
c. regions where two chromosomes remain attached during mitosis.
d. structures at the base of cilia and flagella.
Ans: a. sites of spindle fiber attachment to chromosomes.
Synthesis of different proteins from the same gene is due to
a. intron shuffling
b. exon shuffling
c. exon splicing
d. alternative splicing
Ans: d. alternative splicing
Which of the following statements about exons is false?
All rights reserved © 2025/ 2026 |
MMSC490 Exam 2 Questions and Correct
Answers/ Latest Update / Already Graded
In the nucleus, introns are removed from transcripts by:
a. endonucleases.
b. restriction nucleases.
c. splicing.
d. exonucleases.
Ans: c. splicing
The DNA of eukaryotic cells is wrapped around histones to form
structures called
a. nuclear matrices
b. centromeres
c. nucleosomes
d. nucleoli
Ans: c. nucleosomes
Telomeres are
a. microtubule binding sites in the center of chromosomes.
b. sites at the ends of chromosomes where DNA replication begins.
All rights reserved © 2025/ 2026 |
, Page |2
c. sites at the ends of chromosomes where microtubules bind.
d. chromosome end structures required for complete replication of
linear chromosomes.
Ans: d. chromosome end structures required for complete
replication of linear chromosomes.
During mitosis, highly condensed chromosomes consist of two sister
chromatids joined at the
a. centromere
b. kinetechore
c. centrosome
d. spindle fiber
Ans: a. centromere
Introns constitute about what percentage of the average human gene?
a. 40%
b. 3%
c. 60%
d. 90%
Ans: d. 90%
All rights reserved © 2025/ 2026 |
, Page |3
introns are found
a. only in eukaryotic genes
b. commonly in eukaryotic genes and rarely in prokaryotic genes
c. commonly in both eukaryotic and prokaryotic genes
d. only in prokaryotic genes
Ans: b. commonly in eukaryotic genes and rarely in prokaryotic
genes.
Introns in mRNA-coding genes are the transcribed sequences
a. between protein-coding sequences
b. that code for proteins
c. that regulate mRNA translation
d. that are removed by nucleases
Ans: a. between protein-coding sequences.
Simple-sequence repeats
a. are present in tandem arrays of thousands of copies.
b. sediment as unique bands in equilibrium density-gradient
centrifugation.
All rights reserved © 2025/ 2026 |
, Page |4
c. re-associate more rapidly than non-repeated sequences.
d. All of the above
Ans: d. all of the above
Kinetochores are the
a. sites of spindle fiber attachment to chromosomes.
b. same as centromeres.
c. regions where two chromosomes remain attached during mitosis.
d. structures at the base of cilia and flagella.
Ans: a. sites of spindle fiber attachment to chromosomes.
Synthesis of different proteins from the same gene is due to
a. intron shuffling
b. exon shuffling
c. exon splicing
d. alternative splicing
Ans: d. alternative splicing
Which of the following statements about exons is false?
All rights reserved © 2025/ 2026 |
