MMSC 490 E2 EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2025/2026
The genomes of salamanders contain ten times more DNA than the genomes of humans
because salamanders - Answers have more noncoding DNA than humans have.
A gene can be defined as a segment of DNA that codes for - Answers a functional product.
Introns in mRNA-coding genes are the transcribed sequences - Answers between protein-coding
sequences.
In the nucleus, introns are removed from transcripts by - Answers Splicing
Introns can encode - Answers all of the above (small nucleolar RNAs, microRNAs, sequences
that control gene expression)
Histone genes have - Answers no introns
Introns constitute about what percentage of the average human gene? - Answers 90%
Synthesis of different proteins from the same gene is due to - Answers Alternative splicing
Simple-sequence repeats - Answers All of the above (sediment as unique bands in equilibrium
density-gradient centrifugation, are present in tandem arrays of thousands of copies,
reassociate more rapidly than non repeated sequences)
A gene family is a - Answers set of related but slightly different genes present in one individual.
Pseudogenes are - Answers nonfunctional gene copies.
What is the term used to describe functional protein encoding regions found completely within
an intron? - Answers Nested gene
During the processing of miRNAs, which of the following cleaves the 5ʹ and 3ʹ tails away from
the hairpin structure in the primary miRNA transcript? - Answers Drosha
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 - Answers Satellite DNA
During metaphase in actively dividing cells, DNA is found in which of the following? - Answers
Chromosomes
During mitosis, highly condensed chromosomes consist of two sister chromatids joined at the -
Answers Centromere
During what phase of mitosis does the nuclear membrane reform? - Answers Telophase
, The extended length of all the DNA in one human cell is about two - Answers meters
The chromosomes of prokaryotes differ from those of eukaryotes in that prokaryotic
chromosomes are - Answers Circular
The DNA of eukaryotic cells is wrapped around histones to form structures called - Answers
nucleosomes
Nuclease digestion of chromatin occurs at sites separated by approximately 200 base pairs
because - Answers nucleosomes are spaced 200 base pairs apart.
A chromatosome is a complex of eight core - Answers histones, one histone H1 molecule, and
166 base pairs of DNA.
Heterochromatin consists of - Answers highly condensed, transcriptionally inactive chromatin.
Euchromatin consists of - Answers decondensed, transcriptionally active chromatin.
Kinetochores are the - Answers sites of spindle fiber attachment to chromosomes.
Telomeres are - Answers chromosome end structures required for complete replication of linear
chromosomes.
The transfer of information from parent to progeny that is not based on DNA sequence is known
- Answers epigenetic inheritance.
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. -
Answers 26,000
Which of the following statements about introns is true? - Answers They are part of a gene, but
they are absent from the corresponding mRNA.
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? - Answers Alternative splicing
If a human gene is found to contain five introns, the mature mRNA encoded by that gene would
have how many exons? - Answers There could be multiple mRNAs that contain between one
and six introns.
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? - Answers One molecule of H1
protein
Which of the following statements about exons is false? - Answers An exon may contain
The genomes of salamanders contain ten times more DNA than the genomes of humans
because salamanders - Answers have more noncoding DNA than humans have.
A gene can be defined as a segment of DNA that codes for - Answers a functional product.
Introns in mRNA-coding genes are the transcribed sequences - Answers between protein-coding
sequences.
In the nucleus, introns are removed from transcripts by - Answers Splicing
Introns can encode - Answers all of the above (small nucleolar RNAs, microRNAs, sequences
that control gene expression)
Histone genes have - Answers no introns
Introns constitute about what percentage of the average human gene? - Answers 90%
Synthesis of different proteins from the same gene is due to - Answers Alternative splicing
Simple-sequence repeats - Answers All of the above (sediment as unique bands in equilibrium
density-gradient centrifugation, are present in tandem arrays of thousands of copies,
reassociate more rapidly than non repeated sequences)
A gene family is a - Answers set of related but slightly different genes present in one individual.
Pseudogenes are - Answers nonfunctional gene copies.
What is the term used to describe functional protein encoding regions found completely within
an intron? - Answers Nested gene
During the processing of miRNAs, which of the following cleaves the 5ʹ and 3ʹ tails away from
the hairpin structure in the primary miRNA transcript? - Answers Drosha
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 - Answers Satellite DNA
During metaphase in actively dividing cells, DNA is found in which of the following? - Answers
Chromosomes
During mitosis, highly condensed chromosomes consist of two sister chromatids joined at the -
Answers Centromere
During what phase of mitosis does the nuclear membrane reform? - Answers Telophase
, The extended length of all the DNA in one human cell is about two - Answers meters
The chromosomes of prokaryotes differ from those of eukaryotes in that prokaryotic
chromosomes are - Answers Circular
The DNA of eukaryotic cells is wrapped around histones to form structures called - Answers
nucleosomes
Nuclease digestion of chromatin occurs at sites separated by approximately 200 base pairs
because - Answers nucleosomes are spaced 200 base pairs apart.
A chromatosome is a complex of eight core - Answers histones, one histone H1 molecule, and
166 base pairs of DNA.
Heterochromatin consists of - Answers highly condensed, transcriptionally inactive chromatin.
Euchromatin consists of - Answers decondensed, transcriptionally active chromatin.
Kinetochores are the - Answers sites of spindle fiber attachment to chromosomes.
Telomeres are - Answers chromosome end structures required for complete replication of linear
chromosomes.
The transfer of information from parent to progeny that is not based on DNA sequence is known
- Answers epigenetic inheritance.
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. -
Answers 26,000
Which of the following statements about introns is true? - Answers They are part of a gene, but
they are absent from the corresponding mRNA.
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? - Answers Alternative splicing
If a human gene is found to contain five introns, the mature mRNA encoded by that gene would
have how many exons? - Answers There could be multiple mRNAs that contain between one
and six introns.
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? - Answers One molecule of H1
protein
Which of the following statements about exons is false? - Answers An exon may contain
