Applying Techniques

​Learning and applying common biological techniques is essential for modern biological research and analysis, as they allow scientists to investigate biological processes and structures, ranging from the molecular level to entire ecosystems. These techniques are used to collect, analyze, and interpret data, which is fundamental to understanding the living world. They also provide practical skills necessary for careers in medicine, environmental science, and biotechnology.

Molecular and Cellular Techniques
These techniques enable scientists to study the fundamental building blocks of life, providing insights into genetic and biochemical processes.

• Paper or thin-layer chromatography (TLC) is used to separate mixtures of molecules, such as pigments or amino acids, based on their differential solubility and affinity for a stationary phase. This is crucial for identifying components in a complex sample, like separating chlorophylls and carotenoids from a plant extract.  See C1.3.4

Majhi, Kartick & Karfa, Paramita & Madhuri, Rashmi. (2019). Chromatographic Separation of Amino Acids. 10.1007/978-3-030-06082-4_4.

• Colorimetry or spectrophotometry measures the concentration of a substance in a solution by analyzing its absorption or transmission of light. This technique is used to quantify the amount of a specific molecule, such as measuring glucose levels in a blood sample or protein concentration in a cell culture.

Vista, Shree. (2015). Use of Humic acid in agriculture.

• Serial dilutions are used to create a series of solutions with a precisely decreasing concentration. This is a fundamental skill in microbiology and biochemistry, enabling the calculation of microbial cell density (e.g., in a bacterial culture) or the creation of standard curves for spectrophotometry.

Hester, Laurel & Sarvary, Mark & Ptak, Corey. (2014). Mutation and Selection: An Exploration of Antibiotic Resistance in Serratia marcescens. ested Studies for Laboratory Teaching Proceedings of the Association for Biology Laboratory Education. 35. 140-183.

• Physical and digital molecular modeling allows scientists to visualize and analyze complex molecular structures, like proteins and DNA. This helps in understanding how molecules interact, which is vital for drug design and studying enzyme-substrate interactions.  See B1.2.2

• A light microscope and eyepiece graticule are used to visualize and measure microscopic structures, such as cells and organelles. The graticule acts as a ruler, allowing for the accurate measurement of cell size or the dimensions of a microorganism.  See A2.2.2

• ​Preparation of temporary mounts is a quick and effective way to prepare specimens for microscopic examination, such as observing live cells or small organisms, which is crucial for quick assessments in the field or classroom.  See A2.2.2

Organismal and Ecological Techniques
These techniques focus on studying organisms in their natural environments, from individual classification to population dynamics.

• Identifying and classifying organisms using taxonomic keys and morphological features is vital for understanding biodiversity and the relationships between different species. This practice is foundational to fields like ecology and conservation.  See A3.1.14

Pereira, Ruth & Pinho, Rosa & LOPES, L. (2006). Helping teachers to use urban natural areas for science teaching and environmental education. FRESENIUS ENVIRONMENTAL BULLETIN. 15. 1467-1473.

• Using a variety of sampling techniques, such as random and systematic sampling, is essential for collecting representative data about a population or ecosystem without having to analyze every individual. This allows for accurate estimations of population size, species distribution, or environmental health.  See C4.1.2 and C4.1.3

• Karyotyping and karyograms are used to analyze chromosomes to detect genetic abnormalities. A karyogram is a visual display of an individual's complete set of chromosomes, arranged by size. This technique is routinely used in genetic counseling and prenatal diagnosis to identify conditions like Down syndrome.  See A3.1.7

Supanuam, Praween & Tanomtong, Alongkoad & Khunsook, Sumpars & Khrueanet, Wilailuk & Pinthong, Krit & Wonkaonoi, Weeranuch. (2015). The First Report on Standardized Karyotype and Idiogram of Indochinese Silvered Langur, Trachypithecus germaini germaini (Primates, Colobinae) in Thailand. CYTOLOGIA. 80. 183-192. 10.1508/cytologia.80.183.

• Cladogram analysis is used to visualize evolutionary relationships between different species. By analyzing a cladogram, biologists can infer how closely related different organisms are and trace their shared ancestry. This is a key tool in the field of phylogenetics and systematics.

Pichon, Julien & Luscombe, Nicholas & Plessy, Charles. (2019). Widespread use of the “ascidian” mitochondrial genetic code in tunicates. F1000Research. 8. 2072. 10.12688/f1000research.21551.1.