Biology

Cell Cycle and Chromosomes

1,219 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 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

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 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.

Multiple choice

What is the process by which cells divide to produce two genetically identical daughter cells?

  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 to produce two genetically identical daughter cells. It involves the duplication of chromosomes, segregation of sister chromatids, and cytokinesis, resulting in two daughter cells with the same genetic material as the parent cell.

Multiple choice

What is the process by which cells divide to produce four genetically distinct daughter cells?

  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 cells divide to produce four genetically distinct daughter cells. It involves two rounds of division, resulting in the reduction of chromosome number by half. Meiosis is essential for sexual reproduction and the production of gametes (eggs and sperm).

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 name of the genetic disorder caused by the presence of an extra copy of chromosome 13?

  1. Down syndrome

  2. Turner syndrome

  3. Klinefelter syndrome

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

Patau syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 13.

Multiple choice

What is the name of the process by which cells divide to produce genetically identical daughter cells?

  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 a cell divides into two genetically identical daughter cells.

Multiple choice

What is the term for different forms of a gene that occupy the same locus on homologous chromosomes?

  1. Alleles

  2. Genotype

  3. Phenotype

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

Alleles are different versions of a gene that occupy the same locus on homologous chromosomes, contributing to genetic variation and determining an individual's traits.

Multiple choice

What is the term for the complete set of chromosomes in an organism?

  1. Genome

  2. Karyotype

  3. Genotype

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

Karyotype refers to the complete set of chromosomes in an organism, typically arranged in pairs and analyzed to identify chromosomal abnormalities or genetic disorders.