Notes, summaries, assignments, exams, and exercises for Biology for Vocational training

1. In DNA structure, A always pairs with T. TRUE
2. In DNA structure, cytosine always pairs with adenine. FALSE
3. How many stop codons are there in the genetic code? 3
4. In the genetic code, how many start codons are there? 1
5. In the genetic code, how many naturally occurring amino acids are there? 20
6. Dominant genes are about three times more common than recessive genes. FALSE
7. In this class, Peigler's policy on handheld devices is that they should be turned off and kept out of easy reach. TRUE
8. The traits we studied in the ear of corn were: seed color and plumpness
9. If you cross a white mouse and a black mouse and get gray mice, this is an example of: incomplete dominance
10. Which of the following genotypes is called homozygous dominant? BB
11. Gregor Mendel was a monk

Burnt: a lesion xl'efecte increased temperature

• Thermal: xcontacte with a heat source
  • chemical x contact a chemical agent, acid or base.
  • Electrical: 1 x touch with electrical source.

Severe burns the skin ceases to fulfill its protective function, the affected area loses body fluids

Assessment of burns:

• Extension: body surface area affected, and if the burn is extensive loss of fluid can produce a significant decrease in blood volume (hypovolemic shock.) Location and extent: determining the complications affecting the area of the body determines the severity of injury.
  • Depth: determines the evolution (layers involved)
  • First grade: + surface layer of skin (epidermis)
  • Second degree: epidermis and all or part of the dermis
  • Receiving NO BOTTLES

Humoral Immune Response Dynamics

Primary Antibody Response

The primary humoral response involves the amount of antibody secreted by plasma cells and the clonal expansion of these cells upon first contact with an antigen. This response typically peaks around 7 days (ranging from 5-10 days) after the initial infection. The maximum antibody response is primarily of the IgM isotype, although IgG is also induced by various immunogens. Immunization generally requires a relatively high antigen dose, optimally in the presence of adjuvants for protein antigens.

Secondary Antibody Response

A secondary antibody response occurs upon repeated infection by the same antigen, activating memory cells created following the primary humoral response. This response...

Meiosis: The Key to Genetic Diversity

Meiosis is a specialized type of cell division that reduces the chromosome number by half, resulting in four daughter cells with unique genetic information. This genetic diversity arises from the exchange of genetic material between homologous chromatids. Meiosis occurs in two successive divisions, meiosis I and meiosis II, separated by interphases. Importantly, DNA replication does not occur during the interphase between meiosis I and meiosis II.

Meiosis I: Reduction Division and Genetic Recombination

The first meiotic division is characterized by genetic recombination and a reduction in chromosome number. It consists of four stages:

Prophase I: The Longest and Most Complex Stage

Prophase I is the longest stage...

The Pulmonary Circuit

The pulmonary circuit begins in the right ventricle where deoxygenated blood is pumped through the pulmonary artery to each lung. The artery branches, finally becoming a network of capillaries that carry deoxygenated blood to the alveoli where gas exchange occurs. After gas exchange, oxygenated blood travels through the venous capillaries, the venules, and finally the pulmonary veins to the left atrium.

The Systemic Circuit

The systemic circuit begins in the left ventricle. Oxygenated blood is pumped through the aorta to the upper and lower body. It travels through the arteries, arterioles, and finally arterial capillaries to reach the cells. There, during cellular metabolism, nutrients and oxygen are collected while carbon...

Nervous System Anatomy

The nervous system is a complex network responsible for coordinating actions and transmitting signals throughout the body. It can be broadly divided into several key components:

Somatic Nervous System

The Somatic Nervous System is composed of mixed nerves, containing both sensory and motor axons. These nerves innervate somatic effectors, primarily skeletal muscles.

Central Nervous System (CNS)

The Central Nervous System has a sensory or afferent division that brings information from sensory receptors in the periphery. This includes visual, auditory, somatosensory, and chemoreceptor information. This information is transmitted to higher levels, reaching the motor cortex. The motor or efferent division carries information towards...

Prevention of Tooth Decay

• Fluoride and Fissure Sealants: Application of fluoride and sealing of fissures.
• Dietary Control: Reduce sugar intake, maintain a balanced diet, limit snacking between meals.
• Plaque Control: Implement effective oral hygiene practices (brushing, flossing), regular plaque removal.

Classification of Dental Caries Cavities

Based on G.V. Black's classification:

• Class I: Occlusal cavities on premolars and molars.
• Class II: Interproximal cavities on molars, often extending to occlusal, distal, mesial, or complex surfaces (e.g., occlusomesial, occlusodistal, mesio-occluso-distal).
• Class III: Interproximal cavities on incisors and canines, not involving the incisal angle.
• Class IV: Interproximal cavities on incisors and canines, involving

Skin Vascularization: Blood Supply

The skin is nourished by blood vessels found in the dermis and hypodermis, which transport oxygen and other essential nutrients.

These vessels form two main networks (plexuses):

• Subpapillary (Superficial) Plexus: Located in the deep dermis.
• Subdermal Plexus: Located in the hypodermis.

Skin Innervation: Nerve Endings

The skin is one of the body's most richly innervated sensory organs. There are two main types of nerve endings in the skin:

1. Receiving (Sensory) Endings

   These perceive external environmental stimuli and transmit them to the brain. They allow us to appreciate the sensations of touch, cold, heat, and pain.

2. Effector Endings

   These innervate the blood vessels, perspiration glands, and arrector pili muscles (erector

Annex Glands

The digestive system includes several annex glands that aid in the breakdown of food:

• Salivary Glands

  These glands empty into the oral cavity and are grouped into three pairs:

  • Parotid Glands: Located in front of the ear.
  • Sublingual Glands: Situated under the tongue.
  • Submaxillary Glands: Found under the lower jaw.

  Their primary function is to lubricate food, facilitating easy passage through the digestive tract.

• Liver

  The liver is the largest gland in the body and performs numerous functions. One key role is secreting bile into the duodenum. Bile, stored in the gallbladder, is essential for dissolving fats.

• Pancreas

  The pancreas has dual functions:

  • It produces insulin, which regulates blood glucose levels.
  • It produces pancreatic juice, which,

Cell Cycle and Division

The cell cycle includes the period from when a cell is formed until it divides, resulting in new cells. It has two main stages: Interphase (initial, long duration) and Division (final, short, resulting in two daughter cells).

1. Interphase: This stage includes DNA duplication and consists of three phases: G1, S, and G2. During interphase, the cell nucleus is called the interphase nucleus.

• G1 Phase: mRNA and protein synthesis occurs. The cell has one diplosome (two centrioles). At the end of G1, there is a restriction point (R point), after which the cell is committed to completing S, G2, and M phases.
• S Phase: DNA replication occurs once the cell has reached sufficient size, synthesized essential proteins, and has enough