Notes, summaries, assignments, exams, and problems for Biology

Chemical Evolution

Chemical evolution refers to the processes that created the biomolecules, and then formed structures called protocells. According to Oparin, the first biomolecules were synthesized when the components of Earth’s primitive atmosphere reacted on contact with each other.

Biological Evolution

Biological evolution refers to the processes that led protocells to become different types of cells, and resulted in all the different organisms ever to have inhabited the Earth. Different types of prokaryotic cells were created from primitive cells: heterotrophic cells, photosynthetic cells, aerobic cells, long and very mobile cells.

Fixist Theories

Fixist theories uphold the idea that the species that currently exist on Earth were created... Continue reading "Chemical and Biological Evolution Theories and Characteristics of Hominids" »

Lower Canine

Root may bifurcate into 2 divisions

Chron:

• Enamel: 6-7 y.o
• Eruption: 9-10 y.o
• Root: 12-13 y.o

Geo:

• Lng/lab: pentagon/trapezoid, short side cervical

Mes-Dis:

• Triangular base cervical

Incis:

• Diamond

Labially:

• Cervical ridge/labial ridge/mes-dis development grooves

Lingually:

• Cingulum/lingual ridge/mes-des marginal ridge/1 lingual fossa

Mesial Contact:

• Incisal third

Distal Contact:

• Middle third

Pulp Cavity:

• 1 pulp horn/oval shaped transversally

Cusp Length:

• Distal side is longer

Upper First Premolar

Mesial Marginal Developmental Groove/Canine Fossa

Chro:

• Enamel: 5-6 y.o
• Eruption: 10-11 y.o
• Root: 12-13 y.o

Geo:

• Lng/Bucc: Trapezoid; short side cervical

Mes-Dis:

• Trapezoid; long side cervical

Occlu:

• Hexagonal

Buccally:

• Cervical/Buccal Ridge/Mes-Dis Buccal Developmental Groove

Mesially:

What Is an Enzyme?

An enzyme is a protein that acts as a biological catalyst. Its primary function is to increase the rate of a natural chemical reaction. Enzymes typically react with one specific substrate, and their activity is regulated within the cell through various means, including inhibitors and activators.

Enzyme Structure

Most enzymes are proteins with three-dimensional shapes determined by their specific amino acid sequences.

Key Concepts in Enzyme Activity

• Substrate: When a substrate molecule binds to the highly specific active site of an enzyme, an enzyme-substrate complex is formed. This complex modifies the substrate and initiates a series of chemical reactions, resulting in the formation of a product.
• Transition State: The highest

Food and Nutrition Fundamentals

Key Definitions

Nutrition

The study of nutrients in food, how the body uses them, and the relationship between diet, health, and disease. It involves taking in matter and energy to grow, survive, and reproduce; waste matter and waste energy are produced as by-products.

Food

Any solid or liquid substance consumed to provide nutritional support for an organism.

Nutrients

Compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth, and substances necessary to regulate chemical processes.

Types of Nutrients

Nutrients are classified into two main groups:

• Inorganic compounds: Water and mineral salts.
• Organic compounds: Carbohydrates, Fats (Lipids), Proteins, and Vitamins.

Digestive Process

Key Components of the Digestive System

• Epiglottis: A flap of cartilage at the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.
• Esophagus: The tube that extends from the throat to the stomach.
• Lower Esophageal Sphincter: A bundle of muscles at the low

What Makes a Living Thing ‘Living’?

Non-Living Things

Non-living things are made up of inorganic matter. The most abundant chemical elements that make up inorganic matter are: oxygen (O), silicon (Si), aluminum (Al), and iron (Fe).

Living Things

All living things, also called organisms, are made up of the same chemical elements.

The elements that form part of living matter are known as bioelements.

The six most abundant bioelements are: carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), and sulfur (S). They make up more than 90% of living matter. The atoms and molecules of bioelements combine with each other through chemical reactions, producing biomolecules. Biomolecules may be:

• Inorganic, such as water and mineral salts.
• Organic

Benefits of Plant Cloning

Plant cloning offers several significant advantages for growers:

• Fixed Genotype & Uniformity: Cloned plants retain their exact genetic characteristics, ensuring uniformity in size, growth rate, flowering time, and harvesting time.
• Shortened Time to Flower/Fruit: Clones often mature faster than seed-grown plants.
• Improved Vigor: Plants propagated from cuttings are frequently fuller and stockier.

Methods of Producing Plant Clones

The primary method involves vegetative propagation directly from a mother plant.

Plant Clone Mutation

Mutations in plant clones can be spontaneous (e.g., bud sports) or induced, such as through radiation (gamma rays), as seen in some poinsettia varieties. Mutations that result in dwarfing, variegation,... Continue reading "Mastering Plant Propagation: Cloning & Grafting Techniques" »

All

Long

I-Parkinson Sx(Amimia/Micrgraphia)(dementia/hyperkinesia)II-2nd Park(Neuroleptic)(CO/Arteriscleoris/encephlaiits)III-Syringomyelia(Sensory loss/Wasting/Long tract/Autonomiv)IV-Tx of M Gravis(Ach(-)(CSD)(Plasmophoresis)(thymectomy)V-Foot Drop(L5...)VI-Open Depressed ScullVII-Cerebral artery aneurysm!(gigantic,sacular)VIII-Sterotactic Techniques used for:^^glioblastoma Histology-Lumbar vertebral Fractures:-Sx provoked by brain tumour!-Multifocal Tumours:-Dx for Cerebral artery aneurysm-Cerebral artery naeurysm Clipped by:

-CN 9+10 Dx:-Lesion CN 5(sensory nuclei)-CN 9 lesion!-Malingnant brain glioma

***T/F:

-CS tract(NOT ) onl from Frontal-BS lesion--->controlateral hemiparesis(T)-Bilateral amr paralysis, Central cord(T)-controlateral Focal

Key Concepts in Evolution

Species: A set of individuals that can reproduce with each other and create fertile offspring.

Speciation: A process driven by several factors:

• Natural selection: Natural selection favors some individuals over others.
• Genetic isolation: Members of two different populations within the same species can no longer reproduce with the other population.
• Gradual differentiation: After isolation, populations become increasingly different.
• Speciation: Over time, genetic changes produce such significant differences that it's no longer possible for two populations to produce fertile offspring.

Human Ancestors

• Australopithecus (6 million years ago): The first hominid, walked upright.
• Homo habilis (2.5 million years ago): Used rudimentary

Interaction and Homeostasis

Interaction includes a series of processes whose object is to adapt the body to changing conditions in the internal and external environment. It connects and coordinates the different parts of our body so that they work together.

Homeostasis is the process that maintains the body's stability when there are changes in the internal environment. This process works as a feedback device, meaning that when a variation is detected in a particular element, a series of mechanisms in the body start up to make the variation return to its normal state.

Systems Participating in the Interaction Process

• Sensory Organs: Capture the stimulus, which is transformed into a nerve impulse and transmitted to the nervous system.
• Nervous System: