from24.50CAD/ h
plasma membrane: structure, function, properties
Translated by Google. Click to view original.
Structure of the plasma membraneThe plasma membrane is mainly composed of:
Phospholipids: These amphipathic molecules (having both a hydrophilic and a hydrophobic part) are organized into a double lipid layer. This structure gives the membrane its semi-permeable barrier property.
Proteins: They are integrated into the lipid bilayer and perform various functions: transport of molecules, reception of signals, cellular recognition, etc.
Carbohydrates: Linked to lipids (glycolipids) or proteins (glycoproteins), they play an important role in cell recognition and cellular interactions.
Function of the plasma membrane
Selective barrier: The plasma membrane allows the selective passage of certain molecules while preventing others.
Transport: Membrane proteins provide passive (simple or facilitated diffusion) or active (pumps) transport of molecules across the membrane.
Receiving signals: Membrane receptors allow the cell to detect and respond to signals from its environment.
Cell recognition: Molecules present on the surface of the membrane allow cells to recognize and interact with each other.
Maintenance of homeostasis: The plasma membrane helps maintain a stable intracellular environment by regulating exchanges between the cell and its environment.
Properties of the plasma membrane
Fluidity: The plasma membrane is not a rigid structure but rather fluid, which allows it to deform and change shape.
Asymmetry: The two faces of the plasma membrane have different compositions, which gives the membrane polarity.
Plasma membrane models
Fluid mosaic model: This model, the most accepted, describes the membrane as a constantly changing mosaic of lipids and proteins.
Extra information
Translated by Google. Click to view original.
notebook, penLocation
Online via webcam
General info
Skills:
Age: | Children (7-12 years old) Teenagers (13-17 years old) Adults (18-64 years old) |
---|---|
Student level: | Beginner Intermediate Advanced |
Duration: | 90 minutes |
The class is taught in: | French, Arabic, English |
The cell, the fundamental unit of all living beings, is a complex structure composed of different elements working in harmony.
The plasma membrane: the protective envelope
The plasma membrane is a semi-permeable barrier that delimits the cell and separates it from its environment. It consists of a double layer of phospholipids, in which various proteins are integrated. These proteins play a crucial role in the transport of substances across the membrane, cell communication and cell recognition.
The cytoplasm: the internal environment
The cytoplasm is the aqueous medium inside the cell. It contains many organelles, inclusions, and the cytosol. The cytosol is the liquid part of the cytoplasm, rich in enzymes and molecules necessary for the chemical reactions of the cell.
The Core: The Control Center
The nucleus is a characteristic organelle of eukaryotic cells. It contains the genetic information of the cell in the form of DNA, organized into chromosomes. The nucleus is surrounded by a nuclear envelope pierced by nuclear pores that allow the exchange of molecules between the nucleus and the cytoplasm.
Organelles: specialized factories
Organelles are specialized structures present in the cytoplasm. Each of them fulfills a specific function:
Mitochondria: Nicknamed the "power plants" of the cell, they are the seat of cellular respiration, a process that produces the energy needed by the cell.
The endoplasmic reticulum: A network of membranes involved in the synthesis of proteins and lipids.
The Golgi apparatus: A set of flattened sacs that modify, package, and distribute proteins and lipids synthesized by the endoplasmic reticulum.
Lysosomes: Small vesicles containing digestive enzymes that break down unnecessary or damaged molecules.
The cytoskeleton: the skeleton of the cell
The cytoskeleton is a network of protein filaments that gives the cell its shape, allows it to move, and organizes its organelles. It is made up of three types of filaments: microfilaments, intermediate filaments, and microtubules.
The differences between prokaryotic and eukaryotic cells
There are two main types of cells: prokaryotic cells (bacteria) and eukaryotic cells (animals, plants, fungi). Prokaryotic cells are simpler and do not have a nucleus or membrane-bound organelles. Eukaryotic cells, on the other hand, are more complex and have a nucleus and many organelles.
Ask a question
Send a message explaining your needs and Fatiha will reply soon:
The more detail, the better.
Ex. "Hi, when are you available to meet for a lesson?"
Ex. "Hi, when are you available to meet for a lesson?"
Availability of a typical week
(GMT -05:00) New York
Mon | Tue | Wed | Thu | Fri | Sat | Sun | |
---|---|---|---|---|---|---|---|
0 | |||||||
1 | |||||||
2 | |||||||
3 | |||||||
4 | |||||||
5 | |||||||
6 | |||||||
7 | |||||||
8 | |||||||
9 | |||||||
10 | |||||||
11 | |||||||
12 | |||||||
13 | |||||||
14 | |||||||
15 | |||||||
16 | |||||||
17 | |||||||
18 | |||||||
19 | |||||||
20 | |||||||
21 | |||||||
22 | |||||||
23 |
from C$24.50Online via webcam
100% Satisfaction Guarantee
Good-fit Instructor Guarantee
If you are not satisfied after your first lesson, Apprentus will find you another instructor or will refund your first lesson.
Online reputation
- Instructor since December 2024
- Google connected
Availability of a typical week
(GMT -05:00) New York
Mon | Tue | Wed | Thu | Fri | Sat | Sun | |
---|---|---|---|---|---|---|---|
0 | |||||||
1 | |||||||
2 | |||||||
3 | |||||||
4 | |||||||
5 | |||||||
6 | |||||||
7 | |||||||
8 | |||||||
9 | |||||||
10 | |||||||
11 | |||||||
12 | |||||||
13 | |||||||
14 | |||||||
15 | |||||||
16 | |||||||
17 | |||||||
18 | |||||||
19 | |||||||
20 | |||||||
21 | |||||||
22 | |||||||
23 |
from C$24.50Online via webcam
Good-fit Instructor Guarantee
If you are not satisfied after your first lesson, Apprentus will find you another instructor or will refund your first lesson.
Share
You are here
Private lessons
online via webcam
Similar classes
Baran
Biology - GCSE, A level tutoring and primary school teaching**Class Description:**
This tutoring service offers comprehensive support for GCSE and A-Level Biology students across all UK examination boards. Each session is specifically tailored to the individual learning needs of the student, focusing on both the academic requirements of their syllabus and their personal progress.
As a fourth-year medical student, I bring a deeper understanding of biology through advanced studies and real-world applications, allowing me to provide insight into the subject beyond the curriculum. My teaching approach goes beyond simply preparing for exams; while exam-style questions will be regularly incorporated to ensure familiarity with the format and structure of assessments, the main focus will be on fostering a thorough and long-lasting understanding of biological concepts.
Homework will be assigned after every lesson to reinforce the topics covered and ensure consistent progress. Additionally, exam-style questions will be systematically reviewed and analysed, equipping students with the confidence and exam techniques needed to excel in their qualifications. With this combination of tailored tutoring, practical insight, and academic support, students will be empowered to master their Biology studies and achieve their goals.
I hold advanced DBS certification, have worked with children before and also work in psychology and paediatrics within the NHS.
Dr. AbdelRahman
IGCSE Biology A-Level (AS & A2) Cambridge & Edexcel🌿 Passionate Biology Teacher | IGCSE A Level Specialist (AS & A2) 🌿
With a deep-rooted passion for biology and years of teaching experience, I specialize in guiding students through the intricacies of the IGCSE A Level curriculum. My approach combines interactive learning with real-world applications, making complex concepts accessible and engaging.
🔬 What I Offer:
Customized lesson plans tailored to individual learning styles
Hands-on experiments and practical demonstrations to reinforce theoretical knowledge
Comprehensive exam preparation strategies to boost confidence and performance
📚 My Philosophy:
I believe that every student has the potential to excel in science. My goal is to foster a love for biology while equipping students with the critical thinking skills they need for academic success and beyond.
Join me in exploring the fascinating world of biology!
Yasmin
All About Science: From Grade 1 All the Way to 12As I studied basic medical sciences as well as advanced biology, I became fascinated by how it governs everything around us. Therefore, my goal is to facilitate the subject to my students so they can see how truly interesting science is.
Hagar
Biology, cell biology, science, anatomy and histologyA pharmacist with 5 years of experience teaching biology. It is a great and very enjoyable science in which the student sees the Creator’s power and creativity in his creation. The student will learn what is required of him in his curriculum and enjoy learning this great science in addition to developing his skills in studying it through a simplified explanation and illustrative means and solving the school assignments required of him with it.
Patrick
Come and learn Biology and Chemistry with an expert. Book now and have your best experience.Cell Biology is a fundamental topic in both the IGCSE and CIE AS/A Level Biology curricula. It focuses on the structure, function, and processesof cells, the basic units of life. Here's a breakdown of the content at each level:
---
IGCSE Biology (0610/0970)
At the IGCSE level, cell biology introduces foundational concepts about cells, their structures, and processes:
1. Cell Structure and Organization
-The Cell as the Basic Unit of Life:
- Differences between plant and animal cells.
- Identification and functions of cell structures (organelles):
- Cell membrane: Controls the movement of substances.
- Cytoplasm: Site of metabolic reactions.
- Nucleus: Contains DNA and controls cell activities.
- Mitochondria: Site of aerobic respiration.
- Chloroplasts (plant cells): Site of photosynthesis.
- Vacuole: Contains cell sap (large in plants).
- Cell wall(plant cells): Provides structure and support.
- Use of a light microscope to observe cells.
2. Specialization of Cells.
- Specialized cells and their adaptations:
- Red blood cells, nerve cells, root hair cells, ciliated cells, sperm cells, etc.
- Understanding tissues, organs, and organ systems.
3. Movement of Substances
- Processes for the movement of substances across membranes:
- Diffusion: Movement of particles from high to low concentration.
- Osmosis: Movement of water through a selectively permeable membrane.
- Active transport: Movement of substances against a concentration gradient using energy.
4. Enzymes
- Enzymes as biological catalysts and their role in cell processes.
- Factors affecting enzyme activity: temperature, pH, substrate concentration.
CIE AS and A Level Biology (9700)
At the AS/A Level, cell biology expands significantly, focusing on advanced concepts, cellular processes, and microscopy:
1. Cell Structure
- Prokaryotic vs. Eukaryotic Cells:
- Prokaryotes (bacteria) lack a nucleus and membrane-bound organelles.
- Eukaryotes (plants, animals, fungi, and protists) have a nucleus and organelles.
- Structure and Function of Organelles:
- Nucleus: Contains chromatin and nucleolus.
- Mitochondria: Site of ATP production (aerobic respiration).
- Ribosomes: Site of protein synthesis.
- Endoplasmic Reticulum (ER):
- Rough ER: Protein transport and modification.
- Smooth ER: Lipid synthesis.
- Golgi Apparatus: Modification, packaging, and transport of proteins.
- Lysosomes: Contain enzymes for digestion.
- Chloroplasts (plants): Site of photosynthesis.
- Cell membrane: Phospholipid bilayer and fluid mosaic model.
- Cell wall: Found in plants, fungi, and prokaryotes.
- Microscopy:
- Light microscopes and electron microscopes (TEM and SEM).
- Calculations: magnification and actual size
2. Cell Membranes and Transport
- Structure of the phospholipid bilayer (fluid mosaic model).
- Functions of proteins in the membrane: carriers, channels, and receptors.
- Transport mechanisms:
- Diffusion, facilitated diffusion, osmosis, and active transport.
- Endocytosis and exocytosis (bulk transport).
3. Cell Division
- Mitosis:
- Stages of mitosis: prophase, metaphase, anaphase, and telophase.
- Importance of mitosis for growth, repair, and asexual reproduction.
- Meiosis:
-Production of gametes.
- Significance in genetic variation through crossing over and independent assortment.
4. Cell Communication and Enzymes
- Role of enzymes in metabolism (anabolic and catabolic reactions).
- Cell signaling: How cells communicate via hormones and receptors.
5. Viruses
- Virus structure and replication as non-cellular entities (e.g., HIV and influenza).
-
Summary
- At the IGCSE level, cell biology focuses on basic cell structures, specialized cells, diffusion, osmosis, and enzyme functions.
- At the AS/A Level, it covers advanced topics such as organelle structure, cell division, membrane transport, microscopy, and the differences between prokaryotic and eukaryotic cells.
Talha
Tutoring for both boards of Cambridge and edexcel. IGCSE / GCSE/IB/AS BIOLOGYBiology is particularly a challenging subject because it requires you to first understand the enormous number of concepts and then memories it simultaneously. I'll teach biology through the slides I have prepared (ig/GCSE only) which are made from multiple resource, such as marking scheme, the book and examiner reports, this is beneficial as while I teach the concept it will come to the student the exact way the examiner wants the student to answer, and ofcource while learning the slides he will be Able to directly do the past papers as the notes are mastercopy of the source itself. Moreover, I'll make sure that each topic is fully understood by the student so there will be no room for error.
Gabriella
Studying the biology of all living things and other components of biologyBiology can be tricky as it contains lots of different components. This can be introduced slowly as I will provide support over lessons teaching you lots of information but a slow and steady pace giving you questions and answers along the way. Homework will also be provided this is to ensure that the lesson has stuck into your head and you have grasped it. If not there is no worries as things can take a while to learn but by the end you will feel a lot less stress about what you may be learning in biology. You may be finding one specific topic in biology hard and we can always go over that in the lesson or we can find stuff to look over in the lessons to keep your brains up to date for upcoming important exams.
Dr. Soha
Learn Cell biology, Molecular biology, Genetics, Microbiology, and Biochemistry, along with tests and exam preparationHey students!!. I am Dr. Soha, a Highly qualified and experienced tutor who successfully teaches the following subjects
- Cell biology,
- Molecular biology,
- Genetics,
- Microbiology,
- Biochemistry,
and much more along with tests and exam preparation in an easier way.
If you are looking for a committed and qualified tutor who can assist you in achieving your academic and professional objectives.... Look no further. Let's get started on your path to success!!
I have extensive knowledge in enzymology, stem cell biology, molecular biology, genetics, and stem cell therapy. I am always excited to share my knowledge with students and assist them in reaching their full potential. I am confident that my knowledge and experience qualify me for teaching on an online platform, and I am willing to give more information if necessary.
If you are having trouble with your studies or understanding ideas for your tests, you can contact me. I have a variety of resources available, including medical books, videos, slides, and more. I am committed to assisting students in comprehending complicated scientific concepts and ideas in an entertaining and accessible manner. I can help students grasp difficult subjects, and I am sure that my knowledge and expertise will be a great addition to your online learning environment. Furthermore, I offer guidance on optimizing exam performance through self-study techniques.
My goals are to build strength, self-confidence, and creativity in my students. The lectures I will provide will be advantageous in all aspects according to students' needs. I assign home tasks and provide periodic progress reports.
I can assist you with increasing your critical thinking and problem-solving abilities, understanding difficult medical ideas, and exam preparation.
I will provide Notes and Helping material if needed.
Polina
Biology for high school and first year bachelor studentsUnlock your full potential in biology!
I have obtained a bachelor degree in Biology at the University of Edinburgh, and hold a PhD in Tissue Engineering from the University of Zurich.
Whether you're a high school student preparing for exams or a first-year bachelor's student looking to strengthen your foundation, I will tailor the private lessons to meet your needs. With clear explanations, engaging discussions, and practice exercises, you'll build confidence in topics ranging from cell biology and genetics to human physiology and immunology.
Abrar
Microbiology/ Molecular Biology, Cell Biology subjects (All levels & Boards)Biological lessons taught by subject specialist, Master of science degree holder with 6 years teaching experience.
Currently I am teaching in Middle east Europe and America
I have successfully guided numerous students around the globe, from various grade levels and backgrounds to achieve their educational goals.
•Currently, I am teaching:
1. GCSE students
2. IGCSE students
3. IB students
4. European School students
5. AS/A level students
6. American curriculum
•Boost your understanding: Clear explanations, engaging activities, and practice exercises to solidify your knowledge.
Master exam prep: Conquer past papers, tackle tricky concepts, and build confidence for upcoming tests.
Individualized approach: Personalized curriculum and learning pace to fit your needs and goals.
•Flexible scheduling: Online or in-person lessons to suit your busy schedule.
Thanks for visiting my profile.
Ikram
Support courses in Biology, Microbiology and Molecular Biology / PhD student in Biology and VirologyI offer private lessons to help you deepen your knowledge in biology, microbiology, cellular and biomolecular biology. Whether you are a high school student, a science student, or simply passionate about the subject, I adapt to your level and your specific needs.
In my classes, we will cover fundamental theoretical concepts and practical applications together. My goal is to help you gain a deep understanding of the mechanisms of life, develop your analytical skills, and build your confidence to succeed in your scientific exams and projects.
What you will find in my courses:
- Understanding of the basics and advances of biology and microbiology
- Analysis of cellular and molecular mechanisms
- Scientific methodology and problem solving
- Personalized support for homework and exams
Nicole
Online A-level Biology Tutoring and Exam PreparationHaving achieved an A in A-level Biology in 2023 I am here to provide students the tips to achieve top marks in essays, how to successfully answer 4,5,6 mark questions, and tips on how to memorise key words and the mark schemes. I am also here to breakdown complex topics into understandable concepts which are easier to remember.
My online sessions will provide students a space outside of class time to receive guidance and revision tips whilst keeping a relaxed vibe, I know how stressful exam prep can be!
AQA exam board only.
Hari
**Comprehensive Online Tutoring: Mastering Science, Math, English & Well-being**My online tutoring offers a wide range of subjects, taught by experienced and passionate instructors. In **Biology** and **Zoology**, we cover foundational concepts up to advanced topics, helping students understand life sciences deeply, from cell structure to ecosystems and animal behavior. Our **Math** classes span from basic arithmetic to higher-level topics, fostering strong problem-solving skills and logical reasoning. **English Grammar** sessions improve writing clarity, syntax, and vocabulary, building confidence in both academic and everyday language use. In **Environmental Science**, we explore ecosystems, sustainability, and human impact on the planet, encouraging a responsible and informed approach to environmental challenges. Finally, our **Yoga** classes offer physical and mental benefits, teaching postures, breathing techniques, and mindfulness for overall well-being. Our tutoring ensures an engaging, flexible learning experience, adapting to each student’s pace, from beginners to advanced learners, to build solid knowledge and confidence in each subject.
Jagdish
PERSONALISED BIOLOGY CLASS FOR MICROBIOLOGY AND CELL BIOLOGYThis tutoring class focuses on Biology, Cell Biology, and Microbiology, offering personalized support for students seeking to enhance their understanding of these subjects. Tailored for individual or small group settings, the class covers fundamental biological concepts, including the diversity of life, genetics, cell structure and function, and the role of microorganisms. Sessions emphasize interactive learning through discussion and problem-solving, helping students tackle challenging topics and apply concepts to real-world scenarios. With a focus on building a solid foundation and developing critical thinking skills, this class is ideal for high school and college students looking to strengthen their knowledge and prepare for exams with confidence. Whether you're struggling with specific areas or aiming to deepen your grasp of the material, this tutoring class provides the guidance and resources you need to succeed.
Rati
Biology Detectives: Understanding the World Around UsBiology is all around us and is what our world is created from. In my class, students will ecplore the diverse world of biology, including plants, animals, cellular biology and marine biology. Students will actively participate through problem-solving, discussions, and hands-on activitirs. My teaching styles will be tailored to accomidate the different levels and abilities students may have. We will use learning tools such as videos, visual aids, games and real-woorld examples.
By the end of my teaching, students will have the ability to approach biology in creative ways, using both logic and critical-thinging to find solutions