Bio Q4 Final Vocabulary
DNA (Deoxyribonucleic Acid):
A molecule that carries genetic information. It is the blueprint for building and maintaining an organism, and is found in the cells of all living things.
Nucleotide:
The basic building block of DNA and RNA. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base (adenine, thymine, cytosine, or guanine in DNA).
Base Pair:
A pair of nitrogenous bases in a DNA molecule that are held together by hydrogen bonds. The base pairs in DNA are adenine (A) with thymine (T), and cytosine (C) with guanine (G).
Double-Helix:
The structure of DNA, consisting of two strands that twist around each other like a spiral staircase. This was first described by James Watson and Francis Crick.
Sugar-Phosphate Backbone:
The structural component of DNA (and RNA), consisting of alternating sugar (deoxyribose in DNA or ribose in RNA) and phosphate groups that form the "skeleton" of the molecule.
Gene:
A segment of DNA that contains instructions for making proteins or RNA. Genes determine traits and functions in living organisms.
Sequence (DNA or Amino Acid):
The order of nucleotides in DNA or the order of amino acids in a protein. This sequence determines the structure and function of the organism’s proteins.
Structure:
Refers to the specific arrangement or organization of components in biological molecules, cells, or organisms. The structure often dictates the function.
Function:
The role or purpose that a biological component (like a protein, gene, or organ) serves within an organism.
Protein:
A molecule made up of amino acids, essential for many functions in the body including catalyzing reactions (enzymes), building structures, and supporting immune function.
Transcription:
The process by which a segment of DNA is copied into RNA (specifically mRNA) in the nucleus.
Translation:
The process where mRNA is decoded to build a specific polypeptide (protein) at the ribosome in the cytoplasm.
Codon/Codon Wheel:
A three-nucleotide sequence in mRNA that codes for a specific amino acid. The codon wheel is a chart that shows the correspondence between codons and amino acids.
RNA (mRNA, tRNA, rRNA):
mRNA (messenger RNA): Carries the genetic code from the DNA to the ribosome.
tRNA (transfer RNA): Brings amino acids to the ribosome during protein synthesis.
rRNA (ribosomal RNA): Makes up the ribosome and helps with protein synthesis.
Ribosome:
The cellular machinery responsible for translating mRNA into proteins. It’s composed of rRNA and proteins.
Protein Synthesis:
The process by which cells make proteins, involving transcription and translation.
Amino Acid:
The building blocks of proteins. There are 20 different amino acids, each with its own properties.
Specialized Cell:
A cell that has developed a specific function, such as a nerve cell or muscle cell, often through differentiation.
Cell Specialization/Differentiation:
The process by which unspecialized cells (like stem cells) become specialized to perform a specific function in the body.
Mutation:
A change in the sequence of DNA, which can lead to changes in the structure and function of proteins.
Cell:
The basic unit of life. All living organisms are made up of cells.
Tissue:
A group of similar cells working together to perform a specific function (e.g., muscle tissue, nervous tissue).
Organ:
A group of tissues that work together to perform a specific function (e.g., heart, brain, liver).
Organ System:
A group of organs that work together to perform a major function in the body (e.g., the digestive system, respiratory system).
Organism:
An individual living being that can carry out all the basic functions of life, such as a human, plant, or bacterium.
Multicellular:
Organisms composed of many cells, such as humans, animals, and plants.
Unicellular:
Organisms composed of a single cell, such as bacteria and protists.
Nucleus:
A membrane-bound organelle in eukaryotic cells that contains the cell’s genetic material (DNA).
Cytoplasm:
The gel-like substance inside the cell where various cellular processes take place, excluding the nucleus.
Mitosis:
The process of cell division where a single eukaryotic cell divides to produce two genetically identical daughter cells.
Chromosome:
A long strand of DNA wrapped around proteins, containing many genes. Humans typically have 46 chromosomes.
Genetic Information:
The instructions encoded in DNA that guide the growth, development, and functioning of organisms.
Daughter Cells:
The two cells produced from the division of a single parent cell, such as in mitosis.
Stem Cell:
A cell that has the potential to develop into many different types of cells, essential for growth and tissue repair.
Gene Expression:
The process by which a gene's instructions are used to synthesize a functional gene product (such as a protein or RNA).
Gene Regulation:
The mechanisms that control the expression of genes, ensuring that the correct genes are active at the right time.
Homozygous:
An individual with two identical alleles for a particular gene (e.g., AA or aa).
Heterozygous:
An individual with two different alleles for a particular gene (e.g., Aa).
Gamete:
A reproductive cell (sperm or egg in animals) that carries half the genetic information of an organism.
Trait:
A characteristic or feature of an organism, such as eye color, height, or shape of a leaf.
Allele:
One of the different versions of a gene that can exist at a specific locus on a chromosome.
Genome:
The complete set of genetic material (DNA) in an organism, including all of its genes.
Zygote:
A fertilized egg cell, formed when a sperm cell fertilizes an egg cell.
Offspring:
The progeny or descendants of an organism.
Dominant:
An allele that expresses its trait even if only one copy is present (e.g., in a heterozygous individual, the dominant allele is expressed).
Recessive:
An allele whose trait is expressed only when two copies are present (homozygous condition).
Codominance:
A genetic scenario where both alleles in a heterozygous individual are fully expressed (e.g., AB blood type).
Incomplete Dominance:
A genetic scenario where the phenotype of a heterozygote is an intermediate blend of the two parental traits (e.g., red and white flowers making pink flowers).
Multiple Alleles:
A situation where more than two alleles exist for a gene, but an individual can only inherit two (e.g., blood type ABO system).
Punnett Square:
A diagram used to predict the genetic outcomes of a cross between two organisms.
True Breeding:
Organisms that, when bred, produce offspring identical to themselves for a given trait.
Heredity/Inheritance:
The passing of genetic material from parents to offspring.
Environmental Factor:
Any non-genetic influence on an organism’s traits or behavior, such as temperature, diet, or light.
Meiosis:
A type of cell division that reduces the chromosome number by half, creating gametes (sperm and egg).
Homologous Chromosomes:
Chromosomes that have the same genes in the same order but may carry different alleles for those genes.
Fertilization:
The process where sperm and egg cells combine to form a zygote.
Crossing Over:
The exchange of genetic material between homologous chromosomes during meiosis, increasing genetic diversity.
Variation:
Differences in traits among individuals within a population, often due to genetic differences.
Percentage/Proportion:
Mathematical terms for expressing part of a whole, often used in genetic calculations (e.g., genotype frequency).
Probability:
The likelihood that a particular event will occur, often used in genetics to predict inheritance patterns.
Distribution:
How traits or characteristics are spread out in a population.
Common Ancestry/Ancestor:
The concept that different species share a common ancestor from which they have evolved over time.
Biological Evolution:
The process by which species change over time through natural selection and other mechanisms.
Embryo:
An early stage of development in multicellular organisms after fertilization but before birth or hatching.
Analogous Structure:
Structures in different species that have a similar function but evolved independently (e.g., wings of a bat and a bird).
Homologous Structure:
Structures that have a similar origin in different species but may have different functions (e.g., the forelimbs of humans, cats, and whales).
Fossil Record:
The history of life as documented by fossils, providing evidence of past organisms and their evolution.
Anatomy/Anatomical Evidence:
The study of body structures to understand the relationships and evolution of species.
Vestigial Structure:
A structure in an organism that has lost its original function through evolution (e.g., human appendix, whale pelvis).
Molecular Evidence:
Evidence from genetic material (DNA, RNA, proteins) used to trace evolutionary relationships between species.
Biogeography:
The study of the distribution of species and ecosystems across the planet, often providing insights into evolution and ecological interactions.
Natural Selection:
The process by which individuals with traits that are better suited to their environment are more likely to survive and reproduce.
Sexual Reproduction:
A type of reproduction involving the fusion of two gametes (sperm and egg), resulting in offspring with genetic variation.
Resources:
Elements necessary for the survival of organisms, such as food, water, and shelter.
Competitive (Phenotypic) Advantage:
A trait that gives an individual better chances of survival and reproduction in its environment.
Generation:
A group of organisms born and living at the same time or the time span between the birth of parents and their offspring.
Species:
A group of organisms that can interbreed and produce fertile offspring.
Environmental Conditions:
Factors in the environment (e.g., temperature, humidity, food availability) that influence the survival of organisms.
Population:
A group of individuals of the same species living in a specific area.
Competition:
The struggle between organisms for limited resources like food, mates, and space.
Adaptation:
A characteristic or behavior that increases an organism's chances of survival and reproduction in a specific environment.
Climate Change:
Long-term changes in temperature, precipitation, and other climate patterns caused by natural and human factors.
Greenhouse Gas:
Gases in the Earth's atmosphere (e.g., carbon dioxide, methane) that trap heat and contribute to global warming.
Concentration:
The amount of a substance (e.g., greenhouse gases) in a given volume or area.
Ocean pH/Acidification:
The decrease in the pH of ocean water, often caused by excess carbon dioxide absorption, which can harm marine life.
Atmosphere:
The layer of gases surrounding Earth, essential for life and regulating temperature.
Geosphere:
The solid part of the Earth, including the crust, mantle, and core.
Biosphere:
All the living organisms on Earth, including plants, animals, and microorganisms.
Hydrosphere:
The water component of Earth, including oceans, rivers, lakes, and groundwater.
Temperature:
A measure of the warmth or coldness of an environment, affecting the survival of organisms.
Precipitation:
Any form of water (rain, snow, sleet, etc.) that falls from the atmosphere.
Sea Level:
The average level of the ocean's surface, used as a reference point for measuring elevation on land.
Glacier/Sea Ice:
Large masses of ice that form over land (glaciers) or float on the ocean (sea ice).
Weather/Climate:
Weather: Short-term atmospheric conditions.
Climate: Long-term weather patterns in a specific region.
Natural Hazard/Disaster:
Events such as earthquakes, floods, hurricanes, and wildfires that cause damage to the environment and human life.
Disturbance:
An event that disrupts an ecosystem, such as a fire, storm, or human activity.
Wildfire:
A large, uncontrolled fire that spreads rapidly, often in forests or grasslands.
Hurricane:
A powerful tropical storm with strong winds and heavy rain, typically occurring in warm ocean areas.
Volcanic Eruption:
The release of magma, gas, and ash from a volcano, which can have a significant impact on the environment.
Drought/Flood:
Drought: An extended period of deficient rainfall.
Flood: An overflow of water onto normally dry land.
Earthquake/Tsunami:
Earthquake: The shaking of the Earth's surface due to the movement of tectonic plates.
Tsunami: A large ocean wave caused by underwater earthquakes or volcanic eruptions.
Agriculture:
The practice of cultivating plants and raising animals for food, fiber, and other products.
Fossil Fuel:
Natural resources like coal, oil, and natural gas that are burned for energy.
Variable:
A factor that can change in an experiment or study, often influencing the results.
Projection/Prediction:
An estimate or forecast of future conditions based on current data and trends.
Uncertainty:
The degree of doubt or variability in predictions or measurements.
Climate Model:
A computer simulation used to predict future climate conditions based on current data and trends.