Question 1

Which of the following best describes the structure of DNA as proposed by Watson and Crick in 1953?

Accepted Answer

A double helix with two anti-parallel strands connected by base pairing

Question 2

Which of the following is NOT a component of a nucleosome?

Accepted Answer

RNA polymerase II

Question 3

A mutation in a non-coding DNA element such as a LINE retrotransposon can lead to which of the following outcomes?

Accepted Answer

Insertional mutagenesis that disrupts gene function

Question 4

Which of the following statements about heterochromatin is TRUE?

Accepted Answer

It is highly condensed and contains fewer genes

Question 5

A forensic scientist is using VNTRs (Variable Number Tandem Repeats) for DNA fingerprinting in an immigration case. Which property of VNTRs makes them useful for this application?

Accepted Answer

They are highly variable in length between individuals

Question 6

Which of the following best explains why SINEs (Short Interspersed Nuclear Elements) cannot transpose autonomously?

Accepted Answer

They lack the necessary protein-coding sequences for transposition

Question 7

A patient is diagnosed with Duchenne muscular dystrophy, which is caused by a mutation in the largest human gene. What is the name of this gene?

Accepted Answer

Dystrophin

Question 8

Which of the following best describes the relationship between gene length and exon content in human genes?

Accepted Answer

There is a general inverse correlation between gene length and exon content

Question 9

Which chromosome has the highest gene density in the human genome?

Accepted Answer

Chromosome 19

Question 10

Which of the following is a function of histone tails in nucleosomes?

Accepted Answer

They protrude through the minor groove and are targets for post-translational modifications

Question 11

A researcher is studying a non-functional gene copy that arose from a duplication event and now contains multiple stop codons. What is this sequence called?

Accepted Answer

Pseudogene

Question 12

Which of the following best describes the difference between nuclear and mitochondrial genomes in humans?

Accepted Answer

The nuclear genome is inherited from both parents, while the mitochondrial genome is maternally inherited

Question 13

Which of the following DNA elements is most likely to be used as a marker in DNA fingerprinting due to its high variability?

Accepted Answer

VNTRs (Variable Number Tandem Repeats)

Question 14

A mutation in a LINE (Long Interspersed Nuclear Element) retrotransposon is most likely to cause which of the following?

Accepted Answer

Insertional mutagenesis leading to gene disruption

Question 15

Which of the following best describes the role of histone H1 in chromatin structure?

Accepted Answer

It binds outside the nucleosome and stabilizes the DNA

Question 16

A gene contains both coding and non-coding sequences. Which of the following best describes the non-coding sequences within a gene?

Accepted Answer

They include introns and regulatory elements

Question 17

Which of the following equations correctly represents the number of base pairs in the coding sequence of the dystrophin gene, given as $$0.6\% 	imes 2.4 	imes 10^6$?

Accepted Answer

$$0.006 	imes 2.4 	imes 10^6$ = 14,400$$

Question 18

Which of the following is a characteristic of euchromatin?

Accepted Answer

It fluctuates in condensation and is more transcriptionally active

Question 19

Which of the following best explains why retrotransposons can be mutagenic?

Accepted Answer

Their insertion into new genomic locations can disrupt gene function

Question 20

A patient’s genome is analyzed and found to have a high number of Alu repeats. Which class of DNA element do Alu repeats belong to?

Accepted Answer

SINEs (Short Interspersed Nuclear Elements)

Structure of the Human Genome: Organization, Components, and Complexity

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