Cell Biology Quiz
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Questions and Answers

Which of the following is NOT a component of a chromosome?

  • Carbohydrates (correct)
  • DNA
  • RNA
  • Proteins
  • Prokaryotes have a more complex cellular structure than eukaryotes.

    False (B)

    What is the name of the DNA-protein complex found in eukaryotic cells?

    Chromatin

    The genetic material found within chromosomes is called ______.

    <p>DNA</p> Signup and view all the answers

    Match the following cell types with their corresponding domain:

    <p>Bacteria = Bacteria Archaea = Archaea Protists = Eukarya Fungi = Eukarya Plants = Eukarya Animals = Eukarya</p> Signup and view all the answers

    Which of the following species is NOT diploid?

    <p>Bacteria (D)</p> Signup and view all the answers

    The sex chromosomes X and Y are homologous.

    <p>False (B)</p> Signup and view all the answers

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

    <p>Locus</p> Signup and view all the answers

    The two members of a pair of chromosomes are called ______.

    <p>homologs</p> Signup and view all the answers

    Match the following terms with their corresponding descriptions:

    <p>Diploid = Having two sets of chromosomes Allele = Alternative form of a gene Homozygous = Having two identical alleles for a gene Heterozygous = Having two different alleles for a gene Locus = The physical location of a gene on a chromosome</p> Signup and view all the answers

    What is the primary purpose of cell division?

    <p>Both Asexual reproduction and Sexual reproduction (C)</p> Signup and view all the answers

    Eukaryotic cells typically have a single set of chromosomes.

    <p>False (B)</p> Signup and view all the answers

    What is the difference between a gene and an allele?

    <p>A gene is a segment of DNA that codes for a specific trait. An allele is an alternative form of a gene. For example, the gene for eye color can have different alleles, such as an allele for blue eyes and an allele for brown eyes.</p> Signup and view all the answers

    What is the primary purpose of binary fission in bacteria?

    <p>Reproducing Asexually (D)</p> Signup and view all the answers

    Binary fission involves the combination of genetic material from two different gametes.

    <p>False (B)</p> Signup and view all the answers

    What is the name of the protein involved in forming a new cell wall during bacterial cell division?

    <p>FtsZ protein</p> Signup and view all the answers

    The two copies of a replicated chromosome are called ______.

    <p>sister chromatids</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Binary Fission = The process by which a single-celled organism divides into two identical daughter cells. Sister Chromatids = Two identical copies of a replicated chromosome. FtsZ Protein = A protein involved in forming a new cell wall during bacterial cell division. Multicellularity = The state of being composed of multiple cells.</p> Signup and view all the answers

    What are somatic cells?

    <p>Body cells other than gametes (C)</p> Signup and view all the answers

    Germ cells include all body cells except gametes.

    <p>False (B)</p> Signup and view all the answers

    What does cytogenetics allow scientists to detect?

    <p>Abnormal chromosome number or structure</p> Signup and view all the answers

    A karyotype of a diploid human cell consists of __________ sets of chromosomes.

    <p>two complete</p> Signup and view all the answers

    Match the following types of cells with their descriptions:

    <p>Somatic Cells = Body cells, other than gametes Germ Cells = Gametes like sperm and egg Karyotype = Complete set of chromosomes from a single cell Cytogenetics = The study of chromosomes</p> Signup and view all the answers

    What is the primary purpose of mitosis?

    <p>To distribute the replicated chromosomes to the daughter cells (A)</p> Signup and view all the answers

    A human cell has 92 chromosomes after S phase of the cell cycle.

    <p>False (B)</p> Signup and view all the answers

    What structures are joined at the centromere during mitosis?

    <p>Sister chromatids</p> Signup and view all the answers

    In animals, cytokinesis is characterized by the formation of a ______.

    <p>cleavage furrow</p> Signup and view all the answers

    Match the phases of mitosis with their correct descriptions:

    <p>Prophase = The chromosomes condense and the nuclear envelope breaks down Metaphase = Chromosomes align at the cell's equatorial plane Anaphase = Sister chromatids are pulled apart to opposite poles Telophase = Nuclear membranes re-form around the two sets of chromosomes</p> Signup and view all the answers

    What is the end product of meiosis in terms of chromosome number?

    <p>Four haploid cells (A)</p> Signup and view all the answers

    Meiosis involves one division process to reduce chromosome content.

    <p>False (B)</p> Signup and view all the answers

    What does 'haploid' refer to in terms of chromosome number?

    <p>A single set of chromosomes.</p> Signup and view all the answers

    During meiosis, a human gamete must receive one chromosome from each of the _____ pairs.

    <p>23</p> Signup and view all the answers

    Match the gamete type with its description:

    <p>Sperm = Small and mobile male gamete Egg = Large and nonmotile female gamete Polar body = Small cells produced during oogenesis Gamete = Haploid reproductive cell</p> Signup and view all the answers

    Which of the following statements is true about gametes in eukaryotes?

    <p>Heterogamous species have different types of gametes. (C)</p> Signup and view all the answers

    The Y chromosome is responsible for determining maleness in humans.

    <p>True (A)</p> Signup and view all the answers

    What is the role of temperature in sex determination for certain reptiles?

    <p>It influences whether the offspring will be male or female.</p> Signup and view all the answers

    In humans, a diploid cell contains _____ chromosomes.

    <p>46</p> Signup and view all the answers

    Match each sex determination system with its description:

    <p>X-Y system = Seen in mammals including humans Z-W system = Found in birds and some fish Haplodiploid system = Found in bees with males being haploid X-0 system = Used by some insects like fruit flies</p> Signup and view all the answers

    Which of the following correctly compares mitosis and meiosis?

    <p>Mitosis has one division, meiosis has two divisions. (B)</p> Signup and view all the answers

    Spermatogenesis results in two functional gametes.

    <p>False (B)</p> Signup and view all the answers

    What distinguishes gametes in isogamous species from those in heterogamous species?

    <p>Isogamous gametes are morphologically similar, while heterogamous gametes are different.</p> Signup and view all the answers

    The divisions in oogenesis are _____ compared to spermatogenesis.

    <p>asymmetric</p> Signup and view all the answers

    What is the significance of the Y chromosome in determining sex?

    <p>It determines maleness in individuals with a male genotype.</p> Signup and view all the answers

    Flashcards

    Chromosome

    Structures within cells containing genetic material (genes).

    DNA

    The genetic material that makes up chromosomes.

    Eukaryotes

    Cells with a nucleus; include protists, fungi, plants, and animals.

    Prokaryotes

    Simple cells without a nucleus; bacteria and archaea.

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    Chromatin

    The DNA-protein complex found in eukaryotic cells.

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    Eukaryotic Cell

    A type of cell with a nucleus and organelles, found in plants and animals.

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    Somatic Cells

    Body cells in animals, excluding gametes such as sperm and eggs.

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    Germ Cells

    Reproductive cells, specifically sperm and egg cells in animals.

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    Cytogenetics

    The study of chromosomes and chromosomal abnormalities through microscopic examination.

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    Karyotype

    The complete set of chromosomes in a diploid cell, organized for analysis.

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    Diploid

    An organism with two sets of chromosomes, one from each parent.

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    Homologous Chromosomes

    Chromosomes that are nearly identical in size and genetic content, forming a pair.

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    Alleles

    Different versions of a gene that may vary by slight DNA sequence differences.

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    Locus

    The specific physical location of a gene on a chromosome.

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    Genotype

    The genetic makeup of an organism, including dominant and recessive alleles.

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    Sex Chromosomes

    X and Y chromosomes that determine the sex of an organism; not homologous.

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    Chromosome Sets in Eukaryotes

    Eukaryotic species inherit chromosomes in sets, such as diploid and haploid.

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    Cell Division Purpose

    One purpose is asexual reproduction, creating new individuals without sex.

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    Multicellularity

    The condition of being composed of multiple cells working together.

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    Binary Fission

    A form of asexual reproduction where a single cell divides into two identical daughter cells.

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    Sister Chromatids

    Replicated forms of a chromosome, connected by a centromere, before cell division.

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    Eukaryotic Cell Cycle

    A complex series of phases that a eukaryotic cell goes through to replicate and divide.

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    FtsZ Protein

    A protein that helps in forming the cell wall during bacterial cell division.

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    S phase

    The phase in the cell cycle where DNA is replicated.

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    Centromere

    Region of a chromosome where sister chromatids are joined.

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    Mitosis phases

    The five stages of mitosis: prophase, prometaphase, metaphase, anaphase, telophase.

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    Cytokinesis

    The division of the cytoplasm following mitosis, forming two daughter cells.

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    Meiosis

    A cell division process that produces haploid gametes from diploid cells through two successive divisions.

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    Gametes

    Haploid cells that fuse during fertilization to create a new diploid organism.

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    Spermatogenesis

    The process of forming sperm cells in males through meiosis.

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    Oogenesis

    The process of forming egg cells in females, characterized by asymmetric divisions.

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    Mitosis vs Meiosis

    Mitosis produces two identical diploid daughter cells, while meiosis produces four non-identical haploid daughter cells.

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    Isogamous

    Species that produce gametes that are morphologically similar.

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    Heterogamous

    Species that produce morphologically different gametes: usually sperm and egg cells.

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    Chromosome Theory of Inheritance

    States that chromosomes transmit genetic information, accounting for Mendelian patterns of inheritance.

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    Sex Determination

    The biological mechanism that determines the sex of an organism, often involving chromosomes.

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    Human Chromosomes

    Humans have 46 chromosomes: 44 autosomes and 2 sex chromosomes.

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    Haplodiploid System

    A sex determination system in bees where males are haploid (from unfertilized eggs) and females are diploid (from fertilized eggs).

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    X-0 Sex Determination

    In some insects, sex is determined by the number of X chromosomes; males are X0 and females are XX.

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    Study Notes

    Chromosome Transmission During Cell Division and Sexual Reproduction

    • Learning changes everything.
    • Chapter 2 covers chromosome transmission during cell division and sexual reproduction.
    • Topics include features of chromosomes, karyotypes, cell division (prokaryotes and eukaryotes), mitosis, meiosis, and mechanisms of sex determination.

    General Features of Chromosomes

    • Chromosomes are structures within living cells that contain genetic material (genes).
    • They are composed of DNA, the genetic material, and proteins that provide an organized structure.
    • In eukaryotes, the DNA-protein complex is called chromatin.
    • Eukaryotic chromosomes may also contain non-coding RNA.

    Two Types of Cells

    • Two main types of cells are prokaryotes and eukaryotes.
    • Prokaryotes include bacteria and archaea.
    • Eukaryotes include protists, fungi, plants, and animals.
    • Prokaryotic cells lack a nucleus and membrane-bound organelles.
    • Eukaryotic cells contain a nucleus and membrane-bound organelles.

    Features of a Prokaryotic Cell

    • A typical prokaryotic cell, like Escherichia coli, displays an outer membrane and flagellum.
    • The nucleoid contains the bacterial chromosome.
    • Ribosomes are present within the cytoplasm

    Features of a Eukaryotic Cell

    • Eukaryotic cells contain structures like microfilaments, the Golgi body, a nuclear envelope, nucleolus, chromosomal DNA, and the nucleus.
    • Other structures include mitochondria, mitochondria DNA, centrioles, microtubules, polyribosomes, ribosomes, the rough endoplasmic reticulum, cytoplasm, membrane proteins, the plasma membrane, smooth endoplasmic reticulum, and lysosomes.

    Two Types of Animal Cells

    • Animal cells are categorized into somatic and germ cells.
    • Somatic cells include body cells and blood cells, excluding gametes.
    • Germ cells include gametes (sperm and egg cells).

    Cytogenetics

    • Cytogenetics involves the microscopic examination of chromosomes.
    • It aids in identifying individuals with abnormal chromosome numbers or structures.
    • It helps distinguish closely related species.
    • Karyotypes are created for a diploid human cell, displaying two sets of chromosomes.

    Most Eukaryotic Species are Diploid

    • Diploid species possess two sets of chromosomes.
    • Humans have 46 total chromosomes (23 per set).
    • Dogs have 78 total chromosomes (39 per set).
    • Fruit flies have 8 total chromosomes (4 per set).

    Eukaryotic Chromosomes are Inherited in Sets

    • Homologous chromosomes (pairs) have nearly identical size and banding patterns/centromere locations.
    • Homologous chromosomes share the same genes, but not necessarily the same alleles.
    • DNA sequences are remarkably similar (usually less than 1% difference).

    Sex Chromosomes

    • Sex chromosomes (X and Y) are not homologous.
    • They differ in size and genetic composition.
    • They have short regions of homology (shared genes).
    • The physical location of a gene on a chromosome is called its locus.

    Homologous Chromosomes Have the Same Loci

    • Gene loci are locations on homologous chromosomes.
    • Genotypes AA/Bb/cc describe the alleles at corresponding loci.

    Cell Division

    • Cell division serves two primary functions: asexual reproduction in single-celled organisms like bacteria, amoeba, and yeast; and enabling multicellularity in more complex organisms such as humans.

    Binary Fission

    • Binary fission is a process of asexual reproduction in bacteria.
    • The bacterial cell replicates its chromosome before dividing into two daughter cells.
    • FtsZ protein is crucial in creating the new cell wall.

    The Eukaryotic Cell Cycle

    • Cell division in eukaryotes involves complex replication and sorting processes, more intricate than binary fission.
    • These processes involve distinct stages, such as G1, S, G2, and M (mitosis) phases.

    Chromosomes Following DNA Replication

    • Replicated chromosomes are composed of two identical sister chromatids joined by a centromere.

    Chromatids and Chromosomes During Mitosis

    • A human cell with 46 chromosomes in G1 phase would result in 46 pairs of sister chromatids after S phase.
    • The terms "chromosome" and "chromatid" are context-dependent.

    Mitosis

    • Mitosis has the primary purpose of distributing replicated chromosomes to the two daughter cells.
    • It comprises five phases: prophase, prometaphase, metaphase, anaphase, and telophase.

    Structure of the Mitotic Spindle

    • The mitotic spindle comprises structures like the spindle pole (centrosome with centrioles), astral microtubules, polar microtubules, and kinetochore microtubules.

    Entire Process of Mitosis

    • Visualized images depict the phases of mitosis, showcasing progression from Interphase to Prophase, Prometaphase, Metaphase, Anaphase, and Telophase/Cytokinesis.

    Cytokinesis

    • Cytokinesis typically follows mitosis in most cells
    • In animal cells, a cleavage furrow forms.
    • In plant cells, a cell plate forms.

    Meiosis

    • Meiosis enables sexual reproduction in eukaryotes.
    • Diploid parents make haploid gametes with half the genetic material.
    • These gametes fuse during fertilization.

    Meiosis Produces Haploid Gametes

    • Gametes are haploid with one set of chromosomes (1n).
    • Diploid cells (2n), like human cells with 46 chromosomes, have two sets.
    • Human gametes, sperm and eggs, have 23 chromosomes each.
    • Haploid cells are produced from diploid cells during meiosis.

    Meiosis 2

    • After meiosis 1, followed frequently by cytokinesis, meiosis 2 proceeds,
    • The chromosome content is reduced by meiosis.
    • A diploid organism with 6 chromosomes starts with 12 chromatids (joined as 6 pairs of sister chromatids) in mitosis.
    • Meiosis 2 begins with 6 chromatids (joined as three pairs of sister chromatids).

    Entire Process of Meiosis

    • Depicted figures demonstrate the stepwise stages of meiosis during which the chromosome number is reduced from diploid to haploid.

    Mitosis versus Meiosis

    • Mitosis produces two genetically identical diploid daughter cells.
    • Meiosis produces four genetically unique haploid daughter cells.

    Sexual Reproduction

    • Sexual reproduction is a common method of reproduction in eukaryotes, involving gametogenesis.
    • Parents produce haploid gametes through gametogenesis (a process reducing the genetic material to half).
    • Gametes fuse during fertilization to create a new diploid organism.

    Types of Gametes

    • Simple eukaryotic species are isogamous, producing morphologically similar gametes.
    • Most eukaryotic species are heterogamous, with morphologically different gametes: sperm (relatively small and mobile) and egg/ovum (usually large and non-motile).

    Spermatogenesis

    • Spermatogenesis is the process of sperm production.
    • A diagram illustrates the steps from a primary spermatocyte (diploid) to spermatids and eventually sperm cells (haploid) through two divisions (Meiosis I and Meiosis II).

    Oogenesis

    • Oogenesis is the process of egg cell production.
    • Oogenesis differs from spermatogenesis in being asymmetrical, producing polar bodies with limited cytoplasm and one functional egg (haploid).

    The Chromosome Theory of Inheritance

    • The chromosome theory describes how chromosome transmission reflects Mendelian inheritance patterns.
    • It establishes chromosomes as carriers and transmitters of genetic traits.

    Basis for the Chromosome Theory of Inheritance

    • The theory arose from three lines of inquiry: analysis of trait transmission across generations, investigation of inheritance's material basis, and microscopic observation of mitosis, meiosis, and fertilization.

    Sex Determination

    • Chromosomes influence sex determination in many animal species.
    • Other factors, such as temperature, can determine sex for some reptiles and fish.

    Human Sex Determination

    • Humans have 46 chromosomes (44 autosomes and 2 sex chromosomes).
    • Males have one X and one Y chromosome (heterogametic); females have two X chromosomes (homogametic).
    • The Y chromosome is crucial to male determination.

    X-O Sex Determination in Some Insects

    • In some insects, the ratio of X chromosomes (X) to autosomes (A) determines sex. An X/A ratio of 0.5 results in a male; 1.0, a female.

    Z-W Sex Determination in Birds and Some Fish

    • In birds and some fish, males are homogametic (ZZ) and females are heterogametic (ZW).

    Haplodiploid Sex Determination in Bees

    • In bees, males (drones) are haploid, originating from unfertilized eggs.
    • Females (worker bees and queen bees) are diploid, developing from fertilized eggs.

    Ch 2 Study Guide

    • The study guide encompasses differentiating prokaryotic and eukaryotic cells, defining chromosomes, describing cytogenetics and karyotypes, summarizing cell division (binary fission and the eukaryotic cell cycle), differentiating mitosis and meiosis, distinguishing sexual and asexual reproduction, differentiating somatic and germ cells, describing gamete formation, contrasting isogamous and heterogamous species, and explaining various mechanisms of sex determination.

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    Test your knowledge on cell biology concepts, including the structure and function of chromosomes, differences between prokaryotic and eukaryotic cells, and the processes of cell division. This quiz covers various terminologies related to genetics and cell types.

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