Biology: The Cell Structure and Function
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Questions and Answers

All cells have a cell wall.

False (B)

What are the three components that make up the body?

Cells, extracellular substance, and body fluids

What is the primary function of the cell membrane?

Partially isolating the cell from the extracellular environment.

What are the two forms of cytoplasm?

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

What part of the cell membrane is responsible for the ‘unit membrane’ appearance?

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

The fluid mosaic model proposes that lipid molecules are arranged in a single layer.

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

Integral proteins are only found on the surface of the cell membrane.

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

What are the carbohydrate portions of glycoproteins and glycolipids known as?

<p>Cell coat or glycocalyx</p> Signup and view all the answers

What is the process of transport in which cells take materials from the extracellular fluid across the cell membrane?

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

Which type of endocytosis involves invagination of the cell membrane to form a pit?

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

Which type of endocytosis involves engulfing large particles, such as bacteria, using pseudopodia?

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

Receptor-mediated endocytosis is not a specific process.

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

What is the name given to vesicles that fuse to form early endosomes under the cell membrane?

<p>Early endosomes</p> Signup and view all the answers

What is the process called when cytoplasmic vesicles fuse with the plasma membrane, releasing their contents into the extracellular space?

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

What are the two types of endoplasmic reticulum?

<p>Rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER)</p> Signup and view all the answers

The smooth endoplasmic reticulum (SER) is responsible for protein synthesis.

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

The Golgi apparatus consists of stacks of flattened cisternae with vesicles and vacuoles.

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

All cells have only one Golgi apparatus.

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

What is the process called where vesicles carrying proteins bud from the Golgi apparatus?

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

Ribosomes synthesize carbohydrates.

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

Which of the following is NOT a chemical modification that proteins undergo in the Golgi apparatus?

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

The smooth endoplasmic reticulum (SER) stores calcium ions in striated muscle cells.

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

Flashcards

Cell

The basic structural and functional unit of the body, responsible for all life processes.

Cytoplasm

The viscous fluid within the cell, containing water, salts, organic molecules, and enzymes.

Cell Membrane

The outermost layer of the cell, selectively controlling what enters and exits.

Lipid Bilayer

The two-layered structure of the cell membrane, with a hydrophobic interior and hydrophilic exterior.

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Passive Transport

The movement of molecules across the cell membrane without requiring energy.

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Active Transport

Movement of molecules across the cell membrane requiring energy, often against a concentration gradient.

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Endocytosis

Process where the cell takes in material from the extracellular environment by engulfing it in a vesicle.

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Pinocytosis

Uptake of fluids by the cell through invagination of the cell membrane.

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Phagocytosis

Engulfment of large particles like bacteria by the cell using pseudopodia.

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Receptor-mediated endocytosis

Uptake of specific molecules by the cell through binding to receptors on the cell membrane.

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Exocytosis

Process where the cell releases contents from the cytoplasm into the extracellular space.

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Membrane Trafficking

Continuous cycle of separation and return of cell membrane portions by endocytosis and recytosis.

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Endosomes

Vesicles formed during endocytosis that contain the ingested material.

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Endoplasmic Reticulum (ER)

Network of interconnected membranous channels within the cytoplasm.

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Rough Endoplasmic Reticulum (rER)

ER with ribosomes attached, responsible for protein synthesis.

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Smooth Endoplasmic Reticulum (SER)

ER without ribosomes, involved in lipid synthesis, detoxification, and calcium storage.

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Ribosomes

Granules composed of protein and rRNA responsible for protein synthesis.

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Polysomes

Group of ribosomes linked together by mRNA during protein synthesis.

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Golgi Complex

Stack of flattened membranous sacs involved in protein modification and packaging.

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Cis-face

The convex side of the Golgi complex, where proteins enter.

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Trans-face

The concave side of the Golgi complex, where proteins exit.

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Glycosylation

Process of adding sugars to proteins within the Golgi complex.

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Sulfation

Process of adding sulfate groups to proteins within the Golgi complex.

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Phosphorylation

Process of adding phosphate groups to proteins within the Golgi complex.

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Lysosomes

Small membranous sacs containing enzymes that digest cellular debris.

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Mitochondria

The powerhouse of the cell, responsible for energy production.

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Nucleus

The control center of the cell, containing the genetic material (DNA).

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Cytoskeleton

A network of protein fibers that provides shape and support to the cell.

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Cell Differentiation

The process by which cells specialize to perform different functions.

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Cell Death

The death of a cell, which can be programmed or accidental.

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Study Notes

The Cell

  • The body is composed of cells, extracellular substance, and fluids.
  • A cell is the basic structural and functional unit of the body.
  • Cells constantly change in chemical makeup, morphology, and organelle structure.
  • Cells are composed of a nucleus and cytoplasm.

Cytoplasm

  • The cytoplasm is a viscous fluid (cytosol or cytogel)
  • It contains water, salts, organic molecules, enzymes, and organelles.
  • Organelles, inclusions, and usually one nucleus are suspended in the fluid.
  • The activity of the cell determines if the cytoplasm is gel-like or liquid.
  • Non-living components are called inclusions, while living components are organelles.

Cell Membrane

  • The cell membrane isolates the cell from the extracellular fluid.
  • It's composed of proteins, lipids (phospholipids and cholesterol), and carbohydrates.
  • It appears as a trilaminar structure under the electron microscope.
  • The fluid mosaic model shows lipids arranged in two layers, hydrophobic tails inward, and hydrophilic heads outward.
  • Proteins are embedded within the lipid bilayer in a mosaic pattern.

Endocytosis

  • Endocytosis is the process by which the cell takes materials from the extracellular fluid.
  • It involves the folding of the cell membrane to form vacuoles or vesicles.
    • Pinocytosis is the uptake of fluids and small molecules by this method.
    • Phagocytosis is the intake of large particles or cells.
    • Receptor-mediated endocytosis is a targeted method where specific molecules (ligands) bind to receptors on the cell surface.

Exocytosis

  • Opposite of endocytosis; the cell releases materials from vesicles into the extracellular fluid.
  • Vesicles containing materials fuse with the cell membrane to release the contents.
  • crucial for substance transport.

Other Cell Components

  • Endoplasmic Reticulum (ER): A network of membrane channels.
    • Rough ER has ribosomes and synthesizes proteins; these proteins are transported to other organelles within the cell.
    • Smooth ER has no ribosomes and is involved in synthesizing lipids (and steroids).
  • Ribosomes: Granules where proteins are synthesized.
    • Free ribosomes are located in the cytoplasm.
    • Attached ribosomes synthesize proteins that are secreted by the cell.
  • Golgi Complex/Apparatus: A stack of flattened membrane sacs.
    • Refines and packages proteins produced by the ER.
    • Modifies proteins and directs them to their final destinations.

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Description

This quiz covers the fundamental concepts of cell structure, including the components that make up a cell, the function of the cytoplasm, and the role of the cell membrane. Test your understanding of how these elements contribute to cellular activity and overall biological processes.

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