Cell Organelles and Functions Quiz
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Questions and Answers

Which organelle is responsible for synthesizing proteins?

  • Mitochondria
  • Golgi apparatus
  • Ribosomes (correct)
  • Lysosomes
  • The smooth endoplasmic reticulum is studded with ribosomes.

    False (B)

    What is the main function of the mitochondria?

    To produce ATP through cellular respiration

    The cell's genetic material, DNA, is stored in the ______.

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

    Match the following organelles with their primary functions:

    <p>Chloroplasts = Photosynthesis Lysosomes = Cellular digestion Vacuoles = Storage of water, nutrients, and waste Golgi Apparatus = Protein sorting and packaging</p> Signup and view all the answers

    Which of the following is NOT part of the cytoskeleton?

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

    The plasma membrane is a single layer of phospholipids.

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

    What is the function of the nuclear pores present in the nuclear envelope?

    <p>To control the movement of substances in and out of the nucleus</p> Signup and view all the answers

    Which of the following environments would you expect to find a halophile?

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

    Fungi are autotrophic organisms.

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

    What is the main component of a fungal cell wall?

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

    Bacteria that require oxygen to respire are called ______ bacteria.

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

    Match the following terms with their definitions:

    <p>Lytic cycle = Viral replication that kills the host cell Lysogenic cycle = Viral DNA integrates into the host's DNA Endosymbiosis = Theory of eukaryote evolution Autotrophic = Organisms that create their own food through photosynthesis</p> Signup and view all the answers

    Which of the following is NOT a characteristic of plant cells?

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

    Which of the following structures is NOT found in prokaryotic cells?

    <p>Membrane-bound nucleus (A)</p> Signup and view all the answers

    All protists are unicellular

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

    What is the primary method of reproduction for bacteria?

    <p>binary fission</p> Signup and view all the answers

    Autotrophic organisms can produce their own nutrients.

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

    Who is considered the father of taxonomy?

    <p>Carl Linnaeus</p> Signup and view all the answers

    The variety of genes in a population is called ______ diversity.

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

    Match the following organisms with their method of nutrition:

    <p>Amoebas = Heterotrophic - consume other organisms Mushrooms = Heterotrophic - absorb nutrients from dead organisms Ferns = Autotrophic - photosynthesis Dogs = Heterotrophic - bulk feeders</p> Signup and view all the answers

    The two-part naming system used in taxonomy is called ______ nomenclature.

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

    Which of the following best describes the nutritional mode of a plant?

    <p>Autotrophic (C)</p> Signup and view all the answers

    Match the following taxonomic ranks with their correct order from broadest to most specific:

    <p>Domain = Broadest taxonomic rank Kingdom = Second broadest level Phylum = Third-level taxonomic rank Class = Fourth-level taxonomic rank Order = Fifth-level taxonomic rank Family = Sixth-level taxonomic rank Genus = Seventh-level taxonomic rank Species = Most specific taxonomic rank</p> Signup and view all the answers

    Which of the following best describes the Biological Species Concept?

    <p>Identifying species based on whether they can produce viable offspring under natural conditions (D)</p> Signup and view all the answers

    Archaea do not have a cell wall

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

    Describe the characteristics of an animal cell

    <p>Eukaryotic, multicellular, heterotrophic and motile in one stage</p> Signup and view all the answers

    Analogous structures have similar structures but different functions.

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

    Gymnosperms use ______ for reproduction.

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

    What type of evidence does the study of internal cell structure fall under?

    <p>Anatomical/Morphological</p> Signup and view all the answers

    Match the following with what they are known for:

    <p>Acidophiles = Survive in low PH environments Thermophiles = Survive in high temperature environment Saprobial fungi = Feeds on dead organisms Facultative anaerobes = Can survive in both aerobic and anaerobic environments</p> Signup and view all the answers

    Structures that exist but have no function are called ______ structures.

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

    Match the following feeding behaviors with their description:

    <p>Carnivore = An organism that feeds primarily on animals Herbivore = An organism that primarily feeds on plants Omnivore = An organism that feeds on both plants and animals</p> Signup and view all the answers

    According to DNA evidence, which of the following are fungi most closely related to?

    <p>Animals (C)</p> Signup and view all the answers

    Eubacteria are generally found in extreme conditions.

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

    Name the three basic shapes of bacteria.

    <p>Cocci, bacilli, spirilla</p> Signup and view all the answers

    Bacteria that produce methane as an anaerobic byproduct are called ______.

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

    Match the following prefixes to their corresponding numbers:

    <p>mono- = one diplo- = two staphylo- = cluster strepto- = chain</p> Signup and view all the answers

    Flashcards

    What is the function of the nucleus?

    The control center of the cell that stores genetic material (DNA) and regulates gene expression. It also directs protein synthesis.

    What is the function of ribosomes?

    The site of protein synthesis. They can be free-floating in the cytoplasm or attached to the rough endoplasmic reticulum.

    What are the functions of the endoplasmic reticulum (ER)?

    A network of interconnected membranes that helps in protein synthesis, lipid synthesis, detoxification, and calcium storage.

    What is the function of the Golgi apparatus?

    A stack of flattened membrane sacs that sorts, packages, and modifies proteins and lipids for secretion or use within the cell. It also produces lysosomes and vesicles.

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    What is the function of mitochondria?

    The powerhouse of the cell that generates ATP through cellular respiration. It has its own DNA and ribosomes.

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    What is the function of chloroplasts?

    Found in plant cells, chloroplasts are responsible for photosynthesis, converting light energy into chemical energy (glucose). They have their own DNA and ribosomes.

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    What is the function of vacuoles?

    Membrane-bound sacs that store water, nutrients, and waste products. They are particularly large in plant cells and help maintain turgor pressure.

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    What is the function of the cytoskeleton?

    A network of protein filaments that provides structural support, maintains cell shape, and aids in cell movement, intracellular transport, and division.

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    Centrosome

    A specialized structure found only in animal cells that is responsible for organizing microtubules during cell division.

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    Centrioles

    Small, cylindrical structures within the centrosome, made of microtubules, that play a crucial role in organizing microtubules during cell division.

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    Cell Wall

    A rigid outer layer that provides structural support and protection to cells.

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    Cytoplasm

    The jelly-like substance that fills the cell and contains all the cell's organelles.

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    Prokaryotic Cells

    Cells lacking a true nucleus and other membrane-bound organelles.

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    Eukaryotic Cells

    Cells with a membrane-bound nucleus and other membrane-bound organelles.

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    Autotrophic

    Organisms that can produce their own food, typically through photosynthesis.

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    Heterotrophic

    Organisms that cannot produce their own food and must obtain it from other organisms.

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    Carl Linnaeus

    The father of taxonomy, who developed the binomial nomenclature system for classifying organisms.

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    Binomial Nomenclature

    A two-part naming system used to classify organisms, consisting of the genus name and the species name.

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    Dichotomous Key

    A tool used to identify organisms by systematically eliminating possibilities based on their characteristics.

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    Biological Species Concept

    The concept that defines a species based on its ability to reproduce viable offspring with other members of the same species under natural conditions.

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    Morphological Species Concept

    The concept that defines a species based on its physical characteristics, like size, shape, and structure.

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    Phylogenetic Species Concept

    The concept that defines a species based on its evolutionary history, using DNA analysis to determine relationships.

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    Physiology

    The study of the physical and chemical functions of organisms, including how they acquire and process food, how they move, and how they respond to their environment.

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    Aerobic Bacteria

    Bacteria that require oxygen to respire. They cannot survive without oxygen.

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    Obligate Anaerobic Bacteria

    Bacteria that can survive in the absence of oxygen.

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    Facultative Anaerobes

    Bacteria that can survive both aerobically and anaerobically.

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    Binary Fission

    Asexual reproduction in bacteria where a single cell divides into two identical daughter cells.

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    Protists

    Eukaryotic organisms that are generally unicellular and heterotrophic.

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    Animal-like Protists

    Protists that obtain nutrients by consuming other organisms, similar to animals.

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    Fungus-like Protists

    Protists that obtain nutrients by absorbing nutrients from other organisms, living or dead, similar to fungi.

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    Plant-like Protists

    Protists that produce their own food through photosynthesis, similar to plants.

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    Fungi

    Eukaryotic organisms that are generally multicellular and heterotrophic with a cell wall made of chitin.

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    Parasitic Fungi

    A type of fungal nutrition where the fungi live inside a host and absorb nutrients from living cells.

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    Predatory Fungi

    A type of fungal nutrition where the fungi have specialized structures to trap prey.

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    Zygotic Life Cycle

    A long process during which fungi become diploid and haploid in turn.

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    Plants

    Eukaryotic organisms that are multicellular, autotrophic, and non-motile.

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    Photosynthesis

    The process by which plants convert light energy into chemical energy to produce food.

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    Genetic Diversity

    The variety of genes within a population of a single species.

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    Study Notes

    Cell Organelles and Functions

    • Nucleus: Surrounded by a nuclear envelope with pores; contains nucleoplasm, chromatin (DNA + proteins), and the nucleolus. Stores genetic material (DNA) and regulates gene expression. Controls cellular activities by directing protein synthesis. The nucleolus synthesizes ribosomal RNA (rRNA) and assembles ribosome subunits.

    • Ribosomes: Composed of rRNA and proteins; free (floating in cytoplasm) or bound (attached to rough ER). Synthesize proteins by translating messenger RNA (mRNA).

    • Endoplasmic Reticulum (ER): Rough ER is studded with ribosomes, smooth ER lacks ribosomes. Rough ER synthesizes and modifies proteins, transported to the Golgi. Smooth ER synthesizes lipids, metabolizes carbohydrates, detoxifies drugs/poisons, and stores calcium ions.

    • Golgi Apparatus: Stacks of flattened sacs (cisternae). Sorts, packages, and modifies proteins and lipids. Produces lysosomes and vesicles.

    • Mitochondria: Double membrane with inner membrane folds (cristae). Contains its own DNA and ribosomes. "Powerhouse of the cell"; produces ATP through cellular respiration. Involved in energy metabolism and apoptosis.

    • Chloroplasts: (Plant cells only) Double membrane; contains thylakoids (grana) and stroma. Contains its own DNA and ribosomes. Performs photosynthesis, converting light energy into chemical energy (glucose).

    • Lysosomes: (Mostly animal cells) Membrane-bound vesicles with hydrolytic enzymes. Breaks down macromolecules, damaged organelles, and pathogens (cellular digestion). Involved in autophagy (self-cleaning of the cell).

    • Vacuoles: Membrane-bound sacs; larger in plant cells (central vacuole). Stores water, nutrients, and waste products. In plant cells, maintains turgor pressure and support.

    • Cytoskeleton: Network of protein filaments (microfilaments, intermediate filaments, and microtubules). Provides structural support and maintains cell shape. Aids in cell movement, intracellular transport, and cell division.

    • Plasma Membrane: Phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. Controls movement of substances in and out of the cell (selective permeability).

    • Centrosomes and Centrioles: (Animal cells only) Centrosomes contain two centrioles made of microtubules. Organizes microtubules during cell division (mitotic spindle).

    • Cell Wall: (Plant cells, fungi, and some prokaryotes) Rigid outer layer made of cellulose (plants), chitin (fungi), or peptidoglycan (prokaryotes). Provides structural support and protection; regulates cell shape.

    • Cytoplasm: Jelly-like fluid (cytosol) filling the cell, containing organelles. Provides a medium for organelle movement and interaction.

    Cell Types

    • Prokaryotic Cells: No membrane-bound nucleus; simple; includes bacteria and archaea; smaller; often live in extreme environments.

    • Eukaryotic Cells: Membrane-bound nucleus; complex; includes animals, plants, fungi, and protists; larger.

    • Autotrophic: Can produce its own nutrients (e.g., plants via photosynthesis).

    • Heterotrophic: Cannot produce its own nutrients; obtain them from another organism (consuming other organisms or absorbing nutrients).

    Taxonomy

    • Carl Linnaeus: Father of taxonomy.

    • Taxonomy (8 Taxons): Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

    • Binomial Nomenclature: Two-part naming system (Genus species).

    • Dichotomous Key: Method to identify organisms by eliminating possibilities.

    Species Concepts

    • Biological Species Concept: Species are groups capable of interbreeding to produce viable offspring under natural conditions.

      • Advantages: Widely used.
      • Disadvantages: Not always possible to observe natural interbreeding (geographic separation, asexual reproduction).
    • Morphological Species Concept: Species identified based on their morphology (physical characteristics).

      • Advantages: Simple and useful for identifying plants.
      • Disadvantages: Difficulty in defining "significant" differences, may reflect the environment rather than lineage.
    • Phylogenetic Species Concept: Species identified based on evolutionary history (phylogeny); DNA analysis is common.

      • Advantages: Applicable to extinct species; shows evolutionary relationships.
      • Disadvantages: Evolutionary history unknown for all species.

    Determining Relationships Among Organisms

    • Anatomical/Morphological Evidence: Comparing structure (homologous, analogous, vestigial structures).

    • Physiological Evidence: Studying physical/chemical functions (feeding, activity behaviors, proteins).

    • DNA Evidence: Closer DNA sequences indicate closer relationships.

    Kingdoms

    • Bacteria (Eubacteria): Widespread; complex structure; live in various environments, including extreme conditions; often found in food and the body.

    • Archaea: Mostly found in extreme environments.

    • Protista: Eukaryotic; mostly unicellular; heterotrophic (some autotrophic).

    • Fungi: Eukaryotic; heterotrophic; mostly multicellular (except yeasts); cell walls made of chitin.

    • Plantae: Eukaryotic; multicellular; autotrophic, non-motile.

    • Animalia: Eukaryotic; multicellular; heterotrophic; mostly motile.

    Types of Diversity

    • Genetic Diversity: Variations in genes within a species population.

    • Species Diversity: Variety of species in an area (high in forest, low in grassland).

    • Ecosystem Diversity: Variety of ecosystems in the biosphere (range in topography).

    Viruses

    • Virus: Genetic material (DNA or RNA) surrounded by a protein coat; cannot live independently.

    • Lytic Cycle: Virus replication where the virus's genetic material uses host cell machinery to replicate new viruses.

    • Lysogenic Cycle: Viral DNA enters host cell's chromosomes and may remain dormant.

    • Endosymbiosis: Theory that eukaryotic cells developed from symbiotic prokaryotic relationships. Protists diversified into fungi, plant, and animal lineages.

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    Description

    Test your knowledge on the various cell organelles and their specific functions in cellular activities. This quiz covers the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, and mitochondria. Understand how these components contribute to the overall functioning of a cell.

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