Podcast
Questions and Answers
Which of the following is NOT a viral disease caused in plants?
Which of the following is NOT a viral disease caused in plants?
- Mosaic diseases of tobacco
- Common cold (correct)
- Leaf curl of papaya
- Little-leaf of brinjal
What is a common method of spread for plant viral diseases?
What is a common method of spread for plant viral diseases?
- Direct contact with infected plants
- Soil contamination
- Airborne spores
- Insect vectors (correct)
Which of the following diseases is caused by animal viruses?
Which of the following diseases is caused by animal viruses?
- Pseudorabies (correct)
- Yellow disease of carrot
- Leaf curl of tomato
- Black-ring spot of cabbage
Which viral structure is typically associated with animal viruses?
Which viral structure is typically associated with animal viruses?
What is a common viral infection found in humans?
What is a common viral infection found in humans?
What is the smallest clearly defined unit of life?
What is the smallest clearly defined unit of life?
Which of the following organisms is classified as unicellular?
Which of the following organisms is classified as unicellular?
What do prokaryotic cells lack that distinguishes them from eukaryotic cells?
What do prokaryotic cells lack that distinguishes them from eukaryotic cells?
Which statement correctly contrasts prokaryotic and eukaryotic cells?
Which statement correctly contrasts prokaryotic and eukaryotic cells?
How do all cells originate?
How do all cells originate?
Which feature is NOT a characteristic of prokaryotic cells?
Which feature is NOT a characteristic of prokaryotic cells?
Which type of organism typically has eukaryotic cells?
Which type of organism typically has eukaryotic cells?
The genetic material in prokaryotic cells is found within which structure?
The genetic material in prokaryotic cells is found within which structure?
Which organelle is present only in plant cells?
Which organelle is present only in plant cells?
Which cellular structure's presence varies between prokaryotic and eukaryotic cells?
Which cellular structure's presence varies between prokaryotic and eukaryotic cells?
What defines the shape of a eukaryotic cell?
What defines the shape of a eukaryotic cell?
Which type of cell typically displays a fixed shape?
Which type of cell typically displays a fixed shape?
What is the primary function of the endoplasmic reticulum in a cell?
What is the primary function of the endoplasmic reticulum in a cell?
Which cellular component is made of tubulin and proteins?
Which cellular component is made of tubulin and proteins?
What kind of shape might white blood cells adopt in response to certain conditions?
What kind of shape might white blood cells adopt in response to certain conditions?
What do the shapes of glandular hairs and root hair cells in plants depend on?
What do the shapes of glandular hairs and root hair cells in plants depend on?
What is a key structural difference between plant and animal cells?
What is a key structural difference between plant and animal cells?
Which of the following statements about vacuoles is correct?
Which of the following statements about vacuoles is correct?
Which component is present in animal cells but absent in plant cells?
Which component is present in animal cells but absent in plant cells?
Which statement about the cytoplasm of plant and animal cells is accurate?
Which statement about the cytoplasm of plant and animal cells is accurate?
How do plant and animal cells store excess glucose differently?
How do plant and animal cells store excess glucose differently?
Which structure is present in plant cells but generally absent in animal cells?
Which structure is present in plant cells but generally absent in animal cells?
What is the purpose of the cell wall in plant cells?
What is the purpose of the cell wall in plant cells?
Which of the following correctly describes plasmodesmata?
Which of the following correctly describes plasmodesmata?
What are viruses primarily composed of?
What are viruses primarily composed of?
Which size range is typical for viruses?
Which size range is typical for viruses?
How do viruses reproduce?
How do viruses reproduce?
What is the basis for the conventional classification of viruses?
What is the basis for the conventional classification of viruses?
What is a virion?
What is a virion?
Which of the following is not a typical method for naming viruses?
Which of the following is not a typical method for naming viruses?
What feature of the capsid can vary among different viruses?
What feature of the capsid can vary among different viruses?
Why are viruses considered obligate cellular parasites?
Why are viruses considered obligate cellular parasites?
What is the primary distinction between the lytic and lysogenic cycles of bacteriophages?
What is the primary distinction between the lytic and lysogenic cycles of bacteriophages?
Which of the following steps occurs during the lytic cycle of a T4 bacteriophage?
Which of the following steps occurs during the lytic cycle of a T4 bacteriophage?
What characterizes a temperate bacteriophage?
What characterizes a temperate bacteriophage?
What type of virus structure do most plant viruses consist of?
What type of virus structure do most plant viruses consist of?
Which of the following statements about the lytic cycle is false?
Which of the following statements about the lytic cycle is false?
Which of the following phages is an example of a virulent bacteriophage?
Which of the following phages is an example of a virulent bacteriophage?
During which cycle would you expect a bacteriophage to enter a dormant state?
During which cycle would you expect a bacteriophage to enter a dormant state?
What term is used to describe the bacteriophages that cause lysis and death of the host cell?
What term is used to describe the bacteriophages that cause lysis and death of the host cell?
Flashcards
What is a cell?
What is a cell?
The fundamental building block of all living organisms, a self-contained unit of life.
What are unicellular organisms?
What are unicellular organisms?
Organisms made up of only one cell.
What are multicellular organisms?
What are multicellular organisms?
Organisms made up of multiple cells.
What are prokaryotic cells?
What are prokaryotic cells?
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What are eukaryotic cells?
What are eukaryotic cells?
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What is the nucleoid?
What is the nucleoid?
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What is cytoplasm?
What is cytoplasm?
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What are organelles?
What are organelles?
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Mitochondria
Mitochondria
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Endoplasmic Reticulum
Endoplasmic Reticulum
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Vacuoles
Vacuoles
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Lysosomes
Lysosomes
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Chloroplasts
Chloroplasts
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Centrioles
Centrioles
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Ribosomes
Ribosomes
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Microtubules
Microtubules
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Cell wall in plant cells
Cell wall in plant cells
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Plasma membrane
Plasma membrane
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Cytoplasm
Cytoplasm
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Vacuole in plant cells
Vacuole in plant cells
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Plastids
Plastids
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Cholesterol
Cholesterol
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Plasmodesmata
Plasmodesmata
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Bacteriophages
Bacteriophages
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Lytic Cycle
Lytic Cycle
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Lysogenic Cycle
Lysogenic Cycle
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Virulent Phage
Virulent Phage
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Temperate Phage
Temperate Phage
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Lysogeny
Lysogeny
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Plant Viruses
Plant Viruses
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Tobacco Mosaic Virus (TMV)
Tobacco Mosaic Virus (TMV)
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What are viruses?
What are viruses?
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What is a virion?
What is a virion?
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What is a capsid?
What is a capsid?
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What are capsomeres?
What are capsomeres?
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What is viral replication?
What is viral replication?
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What are bacteriophages?
What are bacteriophages?
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What is the conventional classification of viruses?
What is the conventional classification of viruses?
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What is binomial nomenclature?
What is binomial nomenclature?
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Viral Plant Diseases
Viral Plant Diseases
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Viral Capsid
Viral Capsid
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Viral Envelope
Viral Envelope
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Animal Viral Infections
Animal Viral Infections
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Viral Specificity
Viral Specificity
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Study Notes
Cell Biology Course Objectives
- The course aims to understand cell structure, function, and interactions.
- It also includes studying cellular components, processes, and techniques for investigating cell function.
Core Concepts
- Biology: The study of living organisms.
- Cell Biology (Cytology): A branch of biology focusing on cell structure and function, including essential life processes within cells (e.g., reproduction, nutrition).
- Cell: Fundamental unit of life, serving as a basic structural, functional, and reproductive component of living organisms.
Historical Background
- Cell discovery: Linked to the evolution of microscopy, as cells are too small to see with the naked eye.
- Robert Hooke: Coined the term "cell" in 1665 while examining cork.
- Anton van Leeuwenhoek: Observed living cells and microorganisms (1675).
- Mathias Schleiden: Proposed that all plants are made of cells (1838).
- Theodor Schwann: Proposed that all animals are made of cells (1839).
- Rudolf Virchow: Stated that cells arise only from pre-existing cells (1855). This completes cell theory.
- Louis Pasteur: Experimental evidence regarding the cell theory.
Types of Cells
- Prokaryotic Cells: Simple, primitive cells without a true nucleus.
- Eukaryotic Cells: Complex cells containing a true nucleus and other membrane-bound organelles.
Cell Size
- Eukaryotic cells are typically larger than prokaryotic cells.
- Prokaryotic cells range between 1 to 10 micrometers.
- Eukaryotic cells range between 10 to 100 micrometers.
Cell Structure
- Cell Wall (Plant cells): Rigid outer layer providing protection and support. Primarily composed of cellulose.
- Plasma Membrane: A thin, delicate membrane surrounding the cell, controlling the passage of substances in and out of the cell.
- Cytoplasm: The fluid within the cell, containing organelles and the cytosol.
- Cytosol: The liquid part of the cytoplasm that suspends organelles.
Organelles
- Nucleus: Contains genetic material (DNA) and controls cell activities.
- Mitochondria: Produce energy (ATP) through cellular respiration.
- Ribosomes: Synthesize proteins.
- Endoplasmic Reticulum (Rough & Smooth): Involved in protein synthesis, folding, and transportation; lipid synthesis, detoxification, and calcium storage.
- Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.
- Lysosomes: Break down cellular waste and pathogens.
- Peroxisomes: Breakdown fatty acids and amino acids, detoxify Hydrogen Peroxide.
- Cytoskeleton: Maintains cell shape, permits internal movement, and organizes organelles.
- Vacuoles (Plant Cells): Store nutrients, waste products.
- Cell Wall (Plant Cells): Provides structural support and protection, made of cellulose.
- Centrioles (Animal Cells): Involved in cell division.
Classification of Living Organisms
- Traditional Classification: Categorizes life forms based on observable characteristics such as anatomy and morphology.
- Modern Classification: Considers all heritable traits, including anatomy, morphology, genetic sequences (DNA/RNA and protein), and paleontological data (fossil records).
Kingdoms
- Monera: Prokaryotic organisms (Archaebacteria and Eubacteria)
- Protista: Unicellular or simple multicellular eukaryotic organisms (algae, protozoa).
- Fungi: Multicellular eukaryotic organisms with various nutritional modes (saprophytism, symbiosis, parasitism).
- Plantae: Multicellular eukaryotic organisms performing photosynthesis.
- Animalia: Multicellular eukaryotic heterotrophic organisms that obtain nutrients through ingestion.
Viruses
- Viruses are submicroscopic biological entities lacking cellular organization but possessing genetic material and a protein coat.
- They are obligate intracellular parasites, multiplying inside host cells.
Viral Classification
- Classified based on the types of host cells they infect (e.g., bacterial, plant, animal).
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