Questions and Answers
What is cytology?
The study of the cell
All living organisms are composed of one or more cells.
True
The presence of a ____________ is the key structural difference between prokaryotic and eukaryotic cells.
nuclear envelope
Who discovered cells using a simple microscope?
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Which type of tissue covers and protects the body's external surface?
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What is the primary function of mitochondria?
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What is the function of phagocytosis?
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Enzymes are not proteins.
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What happens to a cell in a hypertonic solution?
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The ____________ is the part of the enzyme that binds to the substrate.
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What is the role of enzymes in biological reactions?
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What is the process called when the cell membrane engulfs large particles?
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Study Notes
Cytology and Cell Structure
- Cytology focuses on the study and analysis of cells, crucial for diagnosing conditions like cancer.
- All living organisms consist of one or more cells, affirming the cellular nature of life.
- Ribosomes, essential for protein synthesis, are present in both prokaryotic and eukaryotic cells.
- Robert Hooke was the first to discover and describe cells using a simple microscope.
Cell Types
- Prokaryotic cells lack a defined nucleus and are generally smaller and simpler than eukaryotic cells.
- Eukaryotic cells are characterized by the presence of a nuclear envelope, distinguishing them from prokaryotes.
- The cell membrane is selectively permeable, allowing specific substances to pass in and out, maintaining cellular homeostasis.
Cell Organelles
- Mitochondria function as the powerhouse of the cell, responsible for energy production.
- The Golgi apparatus plays a crucial role in modifying and packaging cellular products; its absence disrupts cell function.
- Microvilli increase the surface area of cells for enhanced absorption of nutrients and fluids.
- Flagella enable cell mobility by rotating or whipping back and forth when needed.
Tissue Types
- Epithelial tissue serves as protective covering for the body's external surfaces.
- Nervous tissue coordinates and transmits signals, critical for body function.
- Connective tissue, which includes blood, cartilage, and bone, supports and binds different body parts.
- Muscle tissue is unique in its ability to generate force and facilitate movement.
Plant Tissues
- Ground tissue in plants is primarily responsible for photosynthesis.
- Xylem is a type of vascular tissue that transports water and minerals from roots to the rest of the plant.
- Meristematic tissue is essential for rapid cell division and growth; damage to this tissue impairs growth and repair.
Chromosome Information
- In a species with diploid cells containing 18 chromosomes, haploid cells would have 9 chromosomes.
- In a species with a diploid number of 8 (2n=8), the haploid number would be 4.
Cellular Transport
- The phospholipid bilayer has hydrophobic tails facing inward and hydrophilic heads facing outward, forming a barrier for selective permeability.
- Active transport requires energy, in contrast to passive transport mechanisms, which do not.
- Facilitated diffusion is a form of passive transport involving carrier proteins.
- Osmosis regulates water movement across semi-permeable membranes, with cells in hypertonic solutions shrinking as water exits.
- Phagocytosis describes the process where the cell membrane engulfs large particles like pathogens.
Exocytosis and Enzymatic Activity
- Exocytosis is a cellular process for expelling waste products and signaling molecules.
- The enzyme-substrate interaction follows the "lock and key" model, highlighting specificity in biochemical reactions.
- The enzyme's active site is where substrates bind, facilitating catalysis of the reaction.
- Enzymes act as biological catalysts, speeding up reactions by lowering activation energy; they are primarily proteins.
- High temperatures can lead to the denaturation of enzymes, resulting in loss of function.
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Description
Test your knowledge on cytology and the fundamental unit of life, the cell. This quiz covers topics such as cell discovery, structure, and the significance of cells in living organisms. Explore how abnormal cell growth can assist in cancer diagnosis and learn about the components of prokaryotic and eukaryotic cells.
