Cellular Anatomy: Structure and Function of Eukaryotic Organelles
Cell Structure and Function: The Basic Units of Life
Foundations of Cell Theory
The cell is the basic unit of structure and function of living things. All living things are composed of cells. All cells arise from other cells by the process of cell division. Scientists Schleiden and Schwann established these key tenets of cell theory.
Key Components of the Cell (Organelles)
Plasma Membrane
- Structure: A double layer of phospholipids (a lipid molecule combined with a phosphate group).
- Function: Controls
Core Concepts in Microbiology: Genetics, Ecology, and Immunity
Bacterial Genetics and Molecular Processes
Genome Replication and Gene Expression
Foundational Genetic Experiments
Griffith’s transformation experiment demonstrated that non-virulent bacteria could become virulent by absorbing DNA from dead virulent cells, proving that DNA is the genetic material. The Hershey and Chase experiment used radioactive labeling (phosphorus for DNA and sulfur for protein) to confirm that only DNA enters bacterial cells during phage infection, further establishing DNA as
Read MoreEssential Human Body Systems and Their Core Functions
Cardiovascular and Circulatory Systems
The circulatory system, often referred to as the cardiovascular system, is vital for maintaining life. It helps to fight off disease, regulate normal body temperature, and maintain the chemical balance necessary for the body’s homeostasis (a state of balance among all its systems).
Components of the Circulatory System
The circulatory system consists of four major components:
The Heart
About the size of two adult hands held together, the heart rests near the center
Neuroscience Fundamentals: Brain, Nerves, and Sensory Systems Q&A
Fundamentals of the Nervous System
Neuronal Structure and Function
- The Central Nervous System (CNS) is comprised of the brain and the spinal cord.
- Which part of a neuron carries the impulse towards the nucleus? Dendrite
- Which part of a neuron is directly involved with protein synthesis? Nissl body
- Which part of a neuron directly contacts another neuron at the synapse? Synaptic knob
- The phagocytic cells in the CNS are the microglia.
- Which cells provide a means of acquiring nutrients in the brain? Astrocyte
- The
Biotechnology, Fermentation, and Drug Discovery Milestones
Technology and Biotechnology Fundamentals
- Technology applies scientific knowledge for practical purposes.
Defining Biotechnology
- An interdisciplinary field utilizing living systems and organisms to develop or make products.
Key Biotechnology Innovations
CRISPR Gene Editing
- A technology used to precisely manipulate DNA.
- The 2020 Nobel Prize in Chemistry was awarded to Jennifer Doudna and Emmanuelle Charpentier for their work on CRISPR.
Botox (Botulinum Toxin)
- Derived from Clostridium botulinum, producing
Horizontal Gene Transfer and Major Biogeochemical Cycles
Mechanisms of Asexual Reproduction and Gene Transfer
Reproduction is asexual. Haploid organisms possess mechanisms that facilitate parasexual genetic transference (Horizontal Gene Transfer).
Transformation
Transformation occurs when a recipient cell captures free DNA from the surrounding medium, often through a complex protein present in the cell wall. This DNA originates from another cell. The transformed cell incorporates these new genes. Cells capable of undergoing transformation are considered
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