Page 1: Cell Structure and Processes
This page covers various aspects of cell biology, including bacterial and animal cell structures, diffusion, osmosis, the cell cycle, and stem cells.
Bacteria and Animal Cells:
The document explains that bacteria multiply through binary fission when given nutrients, moisture, and suitable temperature. It also mentions that bacteria on a nutrient agar plate divide to form colonies of millions of bacteria.
Definition: Binary fission is the process by which bacteria divide into two identical daughter cells.
Diffusion and Osmosis:
The page provides definitions for diffusion and osmosis, two crucial processes in cell biology.
Definition: Diffusion is the spreading out of particles from high to low concentration until they are evenly spread.
Definition: Osmosis is the movement of water particles from a dilute to a more concentrated solution through a partially permeable membrane.
Cell Cycle and Mitosis:
The document outlines the stages of the cell cycle, including growth, DNA replication, mitosis, and cytokinesis.
Highlight: The cell cycle involves six main stages, including cell growth, DNA replication, further growth and DNA repair, mitosis, cytoplasm division, and a temporary resting phase.
Example: During mitosis, chromosomes move about and two nuclei form, followed by the division of cytoplasm to create two identical cells.
Stem Cells:
The page mentions stem cells and their potential applications in treating various conditions.
Example: Stem cells can potentially be used to treat conditions such as dementia, leukemia, heart failure, burns, paralysis, and cardiac arrest.
Specialized Cells:
The document briefly explains specialized cells in plants and animals.
Definition: A specialized cell is one that has differentiated and become a cell with a special function.
Cell Structure:
The page provides information on the structure of plant and animal cells, including their organelles and functions.
Vocabulary: Key cell structures include the nucleus, cell membrane, cell wall, cytoplasm, mitochondria, vacuole, chloroplasts, and ribosomes.
Prokaryotic vs. Eukaryotic Cells:
The document compares prokaryotic and eukaryotic cells, highlighting their main differences.
Highlight: Prokaryotic cells have no true nucleus and no organelles except ribosomes, while eukaryotic cells have a nucleus and various organelles.
Microscopy:
The page briefly mentions light and electron microscopy techniques used to study cells.
Example: Light microscopy uses light rays shining through a glass slide, while electron microscopy uses electrons passed through a thin sample.
This comprehensive overview of cell biology concepts provides students with essential knowledge for their National 5 Biology studies, covering key topics such as cell structure, diffusion and osmosis, the cell cycle, and specialized cells.
