Microbial Genetics, Ecology, and Immunity Fundamentals
Chapter 13 – Bacterial Genome Replication and Expression
Discovery of Genetic Material
- Griffith’s experiment: Showed that non-virulent bacteria could transform into virulent forms by taking up DNA from dead virulent cells. Proved DNA is the genetic material.
- Hershey and Chase Experiment: Used radioactive labeling (P for DNA, S for protein) to show that only DNA enters bacterial cells during phage infection. Proved DNA is the genetic material.
Nucleic Acid Structure
- Structure of DNA: Double helix
Clinical Management of Spinal Deformities and Orthotic Bracing
The human spine is a complex structure composed of 33 vertebrae arranged in cervical, thoracic, lumbar, sacral, and coccygeal regions. In the normal anatomical state, the spine demonstrates four physiological curves: cervical lordosis, thoracic kyphosis, lumbar lordosis, and sacral kyphosis. These curvatures maintain balance, absorb shock, and allow flexibility and mobility.
When these curves are exaggerated, diminished, or altered by abnormal lateral deviations or rotational deformities, spinal
Read MoreEssential Glossary of Evolutionary and Biological Concepts
Evolution
The process of transformation of living generations.
Fossil
Organic remains left in the strata of the Earth.
D. Embryonic
(Definition pending or context specific)
Paleontology
The science that studies the past through fossils.
Carter
(Definition pending or context specific)
Analogous Organs (Similar Body)
Organs that perform the same functions but have different origins.
Homologous Organs (O. Counterpart)
Organs that share the same origin but perform different functions.
Biodiversity
The term referring
Read MoreHuman Anatomy: Skull Structure, Cardiac Circulation, and Vascular Systems
Anatomy of the Skull and Face Bones
Bones Forming the Cranium
The following bones form the skull:
- Frontal
- Parietal (2)
- Temporal (2)
- Occipital
- Sphenoid
- Ethmoid
Key Structures of the Skull
Right Side Structures:
- Coronal Suture
- Frontal Bone
- Ethmoid Bone
- Lacrimal Bone
- Nasal Bone
- Zygomatic Bone (Malar)
- Maxilla
- Mandible
Left Side Structures:
- Parietal Bone
- Sphenoid Bone
- Occipital Bone
- Temporal Bone
- Mastoid Process
- External Acoustic Meatus (Hearing Canal)
- Styloid Process
Cardiac Valves and Blood Flow
Semilunar Valves: Structure and
Read MoreThe Stages of Meiosis I and Key Cell Division Concepts
The First Meiotic Division (Meiosis I)
The first meiotic division is a complex process divided into four main phases. Prophase I is particularly intricate and is further subdivided into five distinct sub-phases.
Prophase I
- Leptotene: The chromosomes condense and become visible, each composed of two sister chromatids.
- Zygotene: Homologous chromosomes recognize each other and begin to pair up in a process called chromosomal synapsis, forming a bivalent (a pair of homologous chromosomes).
- Pachytene: The
Core Principles of Cell Biology, Macromolecules, and Genetics
Cell Biology Fundamentals and Origins
Cell Theory
- The cell is the fundamental unit of life.
- Living organisms are comprised of cells.
- Cells arise only from pre-existing cells.
- All life shares a common ancestor.
Origin of Life and Water Properties
The common origin of life is estimated at 4 billion years ago (bya).
Hypotheses for the Causes of Life:
- Primordial Soup: Early Earth conditions (gases, water, energy) led to the formation of organic molecules.
- Miller-Urey Experiment: Demonstrated that energy reactions