Understanding Biological Molecules: Amino Acids, Proteins, and Genetic Code
B1OA: Amino Acids and Proteins
1. Amino Acid Structure
Amino acids are organic molecules containing an amino group (-NH2) and a carboxyl group (-COOH). These functional groups give amino acids their characteristic properties.
2. Protein Structure and Stability
Proteins fold into specific three-dimensional structures, stabilized by various interactions, including:
- Ionic bonds
- Hydrogen bonding
- Van der Waals forces
- Disulfide bonds
- Hydrophobic interactions
The stability of a protein’s structure is crucial for
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Macromolecules
Carbohydrates
Carbohydrates are composed of monosaccharides and provide energy. Examples include glucose, fructose, and cellulose.
Lipids
Lipids are nonpolar molecules, such as triglycerides and phospholipids, that store energy and form cell membranes.
Proteins
Proteins are made of amino acids and have diverse functions, including enzymatic activity, transport, and support.
Nucleic Acids
Nucleic acids, like DNA and RNA, store and transmit genetic information.
Cells
Cell Structure
Cells are the
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What is DNA recombinant technology?
Recombinant DNA technology involves joining DNA molecules from two different species and inserting them into a host organism to produce new genetic combinations valuable to science, medicine, agriculture, and industry.
Steps Involved in Recombinant DNA Technology:
- Identification and isolation of the gene of interest
- Joining the gene into a suitable vector
- Introduction of the vector into a suitable organism
- Multiplication or expression of the gene of interest
Differences
Read MoreRegulation of Potassium and Body Water: A Comprehensive Guide
Regulation of Potassium
The body maintains potassium balance through internal and external mechanisms.
Internal Balance
- Insulin: Promotes potassium uptake into cells.
- Acidosis: Leads to hyperkalemia (high potassium levels).
- Adrenaline and Noradrenaline: Influence potassium distribution between cells and extracellular fluid.
- Cell lysis, exercise, and increased extracellular osmolarity: Cause potassium to move out of cells.
External Balance
Factors affecting potassium excretion include:
- Extracellular potassium
The Digestive Process: From Swallowing to Bile Secretion
Swallowing
Once food is chewed and lubricated, the swallowing process begins, moving food from the mouth to the stomach. This process involves three stages:
Oral Stage (Voluntary)
The tongue pushes food against the hard palate, the glottis opens, and the esophagus contracts, propelling food into the pharynx.
Pharyngeal Stage (Involuntary)
Lasting about one second, this stage involves the soft palate elevating to close the nasopharynx and the larynx rising to cover the trachea’s opening. This prevents
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Evolutionary Biology: Key Concepts and Mechanisms
Genetics and Population Dynamics
Haplotypes and Linkage Disequilibrium
A haplotype refers to the genotype of linked loci on a chromosome, often used for mitochondrial DNA due to its haploid nature. Linkage disequilibrium describes the non-random association of alleles at different loci. Factors like sexual reproduction and genetic recombination can reduce linkage disequilibrium.
Genetic Load and Population Admixture
Genetic load refers to the fitness
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