Microbiology Fundamentals: Growth, Metabolism, and Control
Microbiology Essentials: Core Concepts
Key Microbial Definitions
- Binary Fission
- A process where a cell elongates, chromosomes replicate, nuclear material divides, the membrane invaginates to the center, and the wall thickens and grows inward, resulting in two daughter cells.
- CHONPS
- Essential elements for life:
- Carbon (synthesis of organic molecules)
- Hydrogen (source of electrons)
- Oxygen (electron acceptor, component of organic molecules)
- Nitrogen (amino acids)
- Phosphorus (phospholipids, nucleic acids)
- Sulfur
Genetic Inheritance: Principles, Laws, and Applications
Genetics is a branch of biology that studies the transmission of hereditary traits and genes. Genetic inheritance refers to the series of mechanisms that transmit traits from an individual to its descendants.
Genetic Inheritance: Core Concepts
Genes and Hereditary Traits
The following are some of the basic concepts of genetic inheritance:
- Hereditary traits are the morphological or physiological characteristics of an individual that can be transmitted to their descendants, such as eye color.
- A gene is
Human Digestive System: Anatomy and Functions
Small Intestine Anatomy and Function
Intestinal Wall Structure
The thin wall of the small intestine is composed of several layers: the intestinal mucosa, muscular layer, and serous layer. The intestinal mucosa throughout the entire intestine has a simple columnar epithelium. It also contains defensive lymphoid tissue, called Peyer’s patches, which are abundant in the jejunum and ileum.
Mucosal Features for Absorption
To increase the absorption surface, the mucosa features:
- Valvulae conniventes (or plicae
Molecular Biology Essentials: DNA, RNA, and Gene Function
Fundamentals of Molecular Biology
RNA Nucleotide Components
An RNA nucleotide consists of three main parts:
- A ribose molecule
- A phosphate group
- A nitrogenous base
The Central Dogma of Molecular Biology
Information is transferred from DNA to RNA to protein.
Gene Expression and Regulation
Impact of Promoter Sequence Mutations
A mutation in the promoter sequence of a gene might prevent RNA polymerase from binding. As a result, the gene would not be transcribed.
DNA Preparation for RNA Synthesis
Before RNA polymerase
Read MoreCiclo de la Reproducción Humana y Desarrollo Sexual
La Reproducción Humana
Las personas nos reproducimos sexualmente: las hembras producen gametos femeninos llamados óvulos y los machos producen gametos masculinos llamados espermatozoides. Estas dos células se unen para formar el cigoto.
La fecundación es interna, es decir, el óvulo y el espermatozoide se unen en el tracto reproductivo interno femenino. El desarrollo del nuevo ser ocurre dentro del aparato reproductor femenino; somos vivíparos.
Procesos Clave de la Reproducción Humana
La reproducción
Read MoreHuman Reproductive System: Core Concepts
Human Reproduction: Core Concepts
The zygote is the first cell of a new living organism. The genetic material of this cell results from the combination of genetic material from the sperm and the egg.
The placenta links the mother’s circulatory system to the embryo’s, extending within the umbilical cord. It is a selective barrier that prevents the two bloods from mixing together, but which allows nutrients to be transferred from the mother’s blood to the embryo’s blood, and waste substances to be transferred
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