Biology - 4BI1 PearsonEdexcel

Cell Structure

Muhtasari

Every living organism, from the smallest bacterium to the tallest tree, is built from cells. Understanding how cells are structured is the foundation of biology: once you know what sits inside a cell and what each part does, you can explain how organisms feed, grow, respire and reproduce.

In this lesson you will learn the structures found in animal and plant cells, discover what makes them different, and explore how cell differentiation produces the specialised cells that multicellular organisms depend on. You will also weigh up the advantages and disadvantages of using stem cells in medicine.

Malengo

  1. Describe cell structures, including the nucleus, cytoplasm, cell membrane, cell wall, mitochondria, chloroplasts, ribosomes and vacuole
  2. Describe the functions of the nucleus, cytoplasm, cell membrane, cell wall, mitochondria, chloroplasts, ribosomes and vacuole
  3. Know the similarities and differences in the structure of plant and animal cells
  4. Explain the importance of cell differentiation in the development of specialised cells
  5. Understand the advantages and disadvantages of using stem cells in medicine

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Maelezo ya Somo

Every cell is a self-contained unit surrounded by a boundary. Inside that boundary, specialised structures called organelles carry out the chemical reactions that keep the cell alive. Some organelles are shared by all cells; others are unique to plants. Knowing which structures are present, and what they do, lets you explain everything from why leaves are green to why muscles need a steady supply of oxygen.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Cell Structure. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. Which structure is found in plant cells but not in animal cells? A) Nucleus B) Mitochondria C) Cell wall D) Ribosome Answer: C
  2. What is the function of mitochondria? A) Photosynthesis B) Protein synthesis C) Aerobic respiration D) Controlling cell activities Answer: C
  3. Red blood cells have no nucleus. This is an advantage because: A) They can move faster through blood vessels B) There is more space for haemoglobin to carry oxygen C) They can divide more easily D) They do not need energy Answer: B
  4. Which of the following best describes a stem cell? A) A cell that has been fully differentiated B) An undifferentiated cell that can develop into different cell types C) A cell found only in plant roots D) A cell with no nucleus Answer: B
  5. What is the role of the permanent vacuole in a plant cell? A) It carries out photosynthesis B) It stores genetic material C) It is filled with cell sap and helps maintain turgor pressure D) It is the site of respiration Answer: C

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Biology Student Book
Pearson Edexcel International GCSE (9-1) Biology Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2017
ISBN: 978-0-435-18426-5
Maelezo: Endorsed student book covering the full 4BI1 specification.

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