Key Biological and Geological Concepts Explained
Habitat
The place where an organism lives. It is normally characterized by physical features of the environment and dominant vegetation. A lake, a meadow, or a pond are examples of habitats.
Metamorphosis
A process of change from larva to adult that occurs in many invertebrates and amphibians.
Sporangia
The spore-producing organs of some plants and fungi.
Placenta
An organ made of maternal and fetal parts that allows the exchange of substances between the fetus and the mother during the embryonic development
Read MoreUnderstanding Immunity: Types, Mechanisms, and Disorders
Immunology
Immune: The property of being invulnerable to a specific disease (usually surmountable). Immunology is specific (like chickenpox) and can be lifelong (like typhus), and should not be confused with disease resistance. Immunology is the science that studies immunity and the immune system.
Types of Immunity
Congenital Immunity (inherited):
- Species: Present in all individuals of a species.
- Race: Present in certain groups or populations of a species.
- Individuals: Present only in a particular individual.
Digestive System Disorders: Symptoms and Mechanisms
All of the evidence.
1. The equation of Nernst tells…
A: We reported an ion balance.
2. Within the types of parenteral feeding is the by:
A: Circulation.
3. About fats:
D: Digestion begins at the esophagus or stomach by mechanical and enzymatic action.
4. Products of the digestion of carbohydrates:
B: Enter the intestinal cells by co-transport.
5. Fats:
C: Almost all are fully digested by gastric lipase at extrapancreatic.
6. In the digestion of carbohydrates, disaccharides are formed.
They are absorbed in
Read MoreMolecular Biology: RNA, DNA, and Embryonic Development
- Types of RNA:
- Messenger RNA (mRNA) is the type of RNA that carries information from DNA to ribosomes.
- Transfer RNA (tRNA) and ribosomal RNA (rRNA) are key elements in the translation process, and various types of RNA regulators.
p
- Operon model: The model of prokaryotic gene regulation: the operon model was proposed in 1961 by Francois Jacob and Jacques Monod. The phenomenon that inspired the idea was enzyme induction. Groups of genes that encode related proteins are grouped into units known as operons.
Vitamins: Functions, Sources, Deficiencies, and Toxicity
Vitamin A
Vitamin A is a group of compounds organized into two classes:
- Retinoids: Preformed vitamin A found in food of animal origin, such as meat, eggs, and dairy products.
- Carotenoids: Precursors of vitamin A present in plant foods (fruits and vegetables), like beta-carotene from green leaves.
Features
- Cell differentiation
- Reproduction
- Growth
- Development of bones and teeth
- Synthesis and maintenance of a healthy epithelium (like the retina)
- Immune system integrity
- Prevention of night blindness (an essential
Essential Functions and Structures of Cells and Tissues
Essential Functions of Cells
Nutrition Function
Type:
- Autotroph bodies: Taken from the exterior with simple inorganic molecules that build organic molecules they need.
- Heterotrophic organisms: Are unable to synthesize organic molecules and have to obtain them from other agencies. They depend on the material synthesized by autotroph-based organizations.
Cellular metabolism: The nutrients undergo a series of complex chemical reactions. These chain reactions are called metabolic pathways, and all the metabolic
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