Question 1

Which of the following best describes the primary advantage of CRISPR-Cas technology over previous gene-editing methods?

Accepted Answer

It is more accurate, efficient, versatile, and easier to use.

Question 2

A scientist is using CRISPR-Cas to correct a mutation causing cystic fibrosis in human cells. Which component is responsible for recognizing the specific DNA sequence to be edited?

Accepted Answer

A synthetic RNA molecule designed to match the target DNA sequence.

Question 3

Which historical theory stated that a fertilized egg contains a fully formed miniature adult, and how was this theory disproven?

Accepted Answer

Preformationism; disproven by the theory of epigenesis and cell theory.

Question 4

Which experiment provided the first solid evidence that DNA, and not protein, is the genetic material in bacteria?

Accepted Answer

Avery, MacLeod, and McCarty's transformation experiment.

Question 5

A diploid human cell contains 46 chromosomes. After meiosis, how many chromosomes will each gamete contain, and what is this number called?

Accepted Answer

23 chromosomes; this is called the haploid number ($$n).$$

Question 6

Which of the following best explains the relationship between genotype and phenotype?

Accepted Answer

The genotype is the set of alleles for a trait, and the phenotype is the observable expression of those alleles.

Question 7

A single-nucleotide mutation in the gene encoding hemoglobin changes the DNA sequence from $$\mathrm{CTC} to$$ $$\mathrm{CAC}. $$What is the consequence of this mutation at the protein level, and which disease does it cause?

Accepted Answer

It results in a glutamic acid to valine substitution, causing sickle-cell anemia.

Question 8

Which of the following statements about recombinant DNA technology is correct?

Accepted Answer

It uses restriction endonucleases and vectors to create recombinant DNA molecules that can be cloned in bacteria.

Question 9

A researcher wants to study the function of a gene by making it nonfunctional and observing the resulting phenotype. Which approach is she using?

Accepted Answer

Reverse genetics using a gene knockout.

Question 10

Which of the following is NOT a typical characteristic of a model organism used in genetic studies?

Accepted Answer

It has a long life cycle and produces few offspring.

Question 11

Transgenic animals have been used to produce therapeutic proteins. Which of the following is a real-world example of this application?

Accepted Answer

Producing anticlotting protein in the milk of transgenic goats.

Question 12

Which of the following best describes the process of translation in gene expression?

Accepted Answer

The synthesis of proteins directed by information encoded in mRNA, using codons to specify amino acids.

Question 13

A geneticist is studying a white-eyed mutation in Drosophila melanogaster. What is the most likely cause of this phenotype?

Accepted Answer

A mutation in the gene controlling eye color, resulting in a different allele.

Question 14

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA is a double helix composed of two strands held together by hydrogen bonds between complementary base pairs.

Question 15

Which of the following best describes the role of tRNA during protein synthesis?

Accepted Answer

tRNA acts as an adapter molecule, recognizing codons in mRNA and carrying the appropriate amino acid to the ribosome.

Question 16

A plant biotechnologist introduces a gene for herbicide resistance into soybeans. What is the resulting organism called, and what is a major societal concern associated with this technology?

Accepted Answer

A transgenic organism; concerns include genetic privacy and food safety.

Question 17

Which of the following best describes the field of proteomics?

Accepted Answer

The study of the set of proteins present in a cell under specific conditions, including their functions and interactions.

Question 18

A couple undergoes whole-genome testing and learns they are both heterozygous carriers for a recessive genetic disorder. What is the probability that their child will inherit the disorder?

Accepted Answer

$$\frac{1}{4}$$

Question 19

Which of the following is a key ethical issue raised by advances in genetics and biotechnology?

Accepted Answer

Genetic discrimination and privacy concerns.

Question 20

Which of the following model organisms is a nematode used in genetic studies of development and disease?

Accepted Answer

Caenorhabditis elegans

Introduction to Genetics: Foundations, Mechanisms, and Applications

Guida di studio - Domande di pratica

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