Question 1

Which of the following best describes an Open Reading Frame (ORF) in genetics?

Accepted Answer

A continuous stretch of codons in mRNA that begins with a start codon and ends at a stop codon, potentially encoding a protein.

Question 2

How many possible reading frames exist in a single-stranded mRNA molecule?

Accepted Answer

$$3$$

Question 3

What is the typical consequence of translating an mRNA in the wrong reading frame?

Accepted Answer

The resulting protein will have a completely different amino acid sequence and likely be nonfunctional.

Question 4

Which of the following statements about introns and exons is correct?

Accepted Answer

Introns are non-coding sequences that are removed during RNA splicing, while exons are coding sequences that remain in the mature mRNA.

Question 5

During the process of transcription and RNA processing in eukaryotes, which of the following occurs first?

Accepted Answer

Transcription of the gene into pre-mRNA

Question 6

Which of the following best describes the difference between a linkage map and a restriction map?

Accepted Answer

A linkage map is based on recombination frequencies, while a restriction map is based on physical distances measured in kilobases.

Question 7

Which of the following is true regarding recombination frequency (RF) and genetic mapping?

Accepted Answer

RF reflects the likelihood of crossover events between genes, but is not equal to the physical distance.

Question 8

Which of the following is NOT a level of gene expression described in genomics?

Accepted Answer

Plastome

Question 9

A genetic polymorphism is best defined as:

Accepted Answer

The existence of two or more alleles at a locus, with an allele frequency greater than $$1\% in $$the population.

Question 10

Which of the following is a common application of Short Tandem Repeats (STRs) in genetics?

Accepted Answer

Parentage analysis and forensic identification

Question 11

Why do larger genomes not necessarily contain more genes?

Accepted Answer

Because most of the additional DNA is highly repetitive and derived from transposable elements.

Question 12

Which of the following statements about transposons is correct?

Accepted Answer

Transposons can move to new locations in the genome and often make their own reverse transcriptase.

Question 13

Which of the following best explains why most genetic polymorphisms in higher organisms are found in non-coding regions?

Accepted Answer

Non-coding regions are less likely to affect organismal fitness, so mutations there are more likely to persist.

Question 14

Which of the following is a key difference between mitochondrial DNA (mtDNA) and nuclear DNA?

Accepted Answer

mtDNA is typically circular and inherited maternally, while nuclear DNA is linear and inherited from both parents.

Question 15

Which of the following is a practical use of single nucleotide polymorphisms (SNPs) in medical genetics?

Accepted Answer

Mapping disease-associated mutations through genome-wide association studies (GWAS)

Question 16

Which of the following best describes the process of constructing a restriction map?

Accepted Answer

Using restriction enzymes to cut DNA at specific sequences and measuring the resulting fragment sizes

Question 17

Which of the following is true about the inheritance of organelle DNA?

Accepted Answer

Organelle DNA is usually inherited maternally and evolves at a different rate than nuclear DNA.

Question 18

Which of the following is a reason why most genetic polymorphisms are considered neutral?

Accepted Answer

They do not significantly affect viability or fertility.

Question 19

Which of the following statements about the Human Genome Project is correct?

Accepted Answer

It revealed that most of the human genome is non-coding and contains many polymorphisms.

Question 20

Which of the following best describes the concept of the exome?

Accepted Answer

All the exons (coding information) of a genome.

Genome Structure, Mapping, and Genetic Polymorphism: Study Notes for Genetics

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