Biology

Cell Cycle and Chromosomes

1,348 Questions

Explore a curated list of questions covering the cell cycle, mitosis, and meiosis. Topics include DNA replication, chromosomal structures, and genetic disorders. This material is essential for students preparing for biology and general science competitive exams.

Cell cycle eventsDNA replicationMeiosis processChromosomal structuresGenetic disorders

Cell Cycle and Chromosomes Questions

Multiple choice

What is the process by which genetic material is exchanged between two homologous chromosomes during meiosis?

  1. Mutation

  2. Recombination

  3. Gene transfer

  4. Epigenetics
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Recombination is the process by which genetic material is exchanged between two homologous chromosomes during meiosis. This process results in the formation of new chromosomes that contain a mixture of genetic material from both parents.

Multiple choice

What is the term for the process by which genetic material is exchanged between two homologous chromosomes during meiosis?

  1. Mutation

  2. Recombination

  3. Gene transfer

  4. Epigenetics
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Recombination is the term for the process by which genetic material is exchanged between two homologous chromosomes during meiosis. This process results in the formation of new chromosomes that contain a mixture of genetic material from both parents.

Multiple choice

What is the term for the process by which cells lose their ability to divide?

  1. Senescence

  2. Apoptosis

  3. Necrosis

  4. Autophagy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Senescence is the term for the process by which cells lose their ability to divide.

Multiple choice

What is the name of the process by which cells divide?

  1. Mitosis

  2. Meiosis

  3. Binary fission

  4. Budding
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mitosis is the process by which cells divide.

Multiple choice

What is the name of the process by which sex cells are produced?

  1. Mitosis

  2. Meiosis

  3. Binary fission

  4. Budding
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Meiosis is the process by which sex cells are produced.

Multiple choice

What is the basic unit of heredity?

  1. Gene

  2. Chromosome

  3. DNA

  4. Protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A gene is the basic unit of heredity and is a region of DNA that codes for a specific protein.

Multiple choice

What is the term for the location of a gene on a chromosome?

  1. Genotype

  2. Phenotype

  3. Allele

  4. Locus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Locus is the location of a gene on a chromosome.

Multiple choice

Which type of cancer is characterized by the presence of the Philadelphia chromosome?

  1. Chronic myeloid leukemia (CML)

  2. Acute lymphoblastic leukemia (ALL)

  3. Non-Hodgkin lymphoma

  4. Multiple myeloma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chronic myeloid leukemia (CML) is characterized by the presence of the Philadelphia chromosome, which is a result of a translocation between chromosomes 9 and 22. This translocation leads to the formation of the BCR-ABL1 fusion gene, which produces a constitutively active tyrosine kinase that drives the development of CML.

Multiple choice

What is a chromosome?

  1. A long molecule of DNA that contains many genes

  2. A protein that helps to package DNA into chromosomes

  3. A structure that helps to organize DNA in the nucleus

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A chromosome is a long molecule of DNA that contains many genes.

Multiple choice

What is the most common type of Down syndrome?

  1. Trisomy 21

  2. Translocation Down syndrome

  3. Mosaic Down syndrome

  4. Partial Down syndrome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trisomy 21 is the most common type of Down syndrome, accounting for about 95% of cases.

Multiple choice

What is the most common type of chromosomal abnormality?

  1. Down syndrome

  2. Trisomy 18

  3. Trisomy 13

  4. Turner syndrome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Down syndrome is the most common chromosomal abnormality, occurring in about 1 in 700 births.

Multiple choice

Which genetic disorder is characterized by an extra copy of chromosome 21?

  1. Down Syndrome

  2. Turner Syndrome

  3. Klinefelter Syndrome

  4. Fragile X Syndrome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Down Syndrome is a genetic disorder caused by an extra copy of chromosome 21, resulting in distinct physical and cognitive characteristics.

Multiple choice

What is the name of the theory that proposes that aging is caused by the shortening of telomeres, the protective caps at the ends of chromosomes?

  1. Mitochondrial Theory

  2. Telomere Theory

  3. Neuroendocrine Theory

  4. Immunological Theory
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Telomere Theory suggests that aging is a result of the progressive shortening of telomeres, which eventually leads to cellular senescence and death.

Multiple choice

What is a chromosome?

  1. A long molecule of DNA

  2. A short molecule of DNA

  3. A protein molecule

  4. A non-protein molecule
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A chromosome is a long molecule of DNA.

Multiple choice

How many chromosomes do humans have?

  1. 23

  2. 46

  3. 92

  4. 184
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Humans have 46 chromosomes.