Question 1

Which of the following best describes the theory of epigenesis as proposed by William Harvey?

Accepted Answer

Body organs and structures develop gradually from the embryo and are not present initially.

Question 2

Louis Pasteur's experiments disproved which widely held belief about the origin of life?

Accepted Answer

Spontaneous generation

Question 3

Which of the following statements about Mendel's experiments is correct?

Accepted Answer

Mendel's quantitative data with peas established the foundation for the study of heredity and variation.

Question 4

During meiosis, what is the chromosome number in the resulting gametes compared to the original diploid cell?

Accepted Answer

Half the original diploid cell ($$n)$$

Question 5

Which of the following best explains the chromosomal theory of inheritance?

Accepted Answer

Genes are located on chromosomes and are transmitted through gametes, ensuring genetic continuity.

Question 6

A mutation in the DNA sequence of the $$\beta-$$globin gene changes the codon GAG to GTG. What is the consequence at the protein level?

Accepted Answer

Glutamic acid is replaced by valine, causing sickle-cell anemia.

Question 7

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA contains uracil, while RNA contains thymine.

Question 8

Which process is described by the central dogma of molecular genetics?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 9

Restriction enzymes were crucial in the development of recombinant DNA technology because they:

Accepted Answer

Cut DNA at specific sequences, enabling the insertion of foreign DNA.

Question 10

Which of the following is a real-world application of biotechnology in agriculture?

Accepted Answer

Genetically modifying crops for increased resistance to herbicides and pests.

Question 11

Which field focuses on the study of all proteins present in a cell under specific conditions?

Accepted Answer

Proteomics

Question 12

Why are model organisms such as Drosophila melanogaster and Mus musculus widely used in genetic studies?

Accepted Answer

They are easy to grow, have short life cycles, and produce many offspring.

Question 13

A scientist wants to determine the function of a gene with a known DNA sequence but unknown role. Which approach should they use?

Accepted Answer

Reverse genetics

Question 14

Which of the following statements about alleles is correct?

Accepted Answer

Alleles are different forms of a gene produced by mutations.

Question 15

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

Accepted Answer

Genotype is the set of alleles for a trait, and phenotype is the expression of those alleles.

Question 16

Which of the following is an example of a gene knockout experiment?

Accepted Answer

Deleting a gene in mice to study its effect on metabolism.

Question 17

Which of the following discoveries directly led to the launch of the era of molecular genetics?

Accepted Answer

The discovery of the double helix structure of DNA.

Question 18

A patient is diagnosed with a genetic disorder caused by a single nucleotide change in a gene. Which molecular process most likely explains the resulting disease phenotype?

Accepted Answer

A change in the DNA sequence alters the mRNA codon, leading to the incorporation of a different amino acid in the protein.

Question 19

Which of the following is a function of bioinformatics in modern genetics?

Accepted Answer

Processing and analyzing large sets of nucleotide and protein sequence data.

Introduction to Genetics: Foundations, Molecular Genetics, and Modern Applications

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