Principles of Biology Lecture Exam 1 Study Guide

Vocabulary flashcards generated from the Principles of Biology Lecture Exam 1 Study Guide covering key biological concepts, scientific methods, chemistry, macromolecule structures, animal behavior, and ecology.

Inductive Reasoning

A form of logical thinking that uses related observations to arrive at a general conclusion.

Deductive Reasoning

A form of logical thinking that uses a general principle or law to forecast specific results.

Null Hypothesis

A default statement in an experiment proposing that no statistical relationship or effect exists between variables.

Alternative Hypothesis

A predictive statement proposing that an experimental variable causes a measurable effect or difference.

Independent Variable

The specific experimental variable or condition that is intentionally changed or manipulated by the experimenter.

Dependent Variable

The response variable that is measured in an experiment to evaluate the outcome of manipulating the independent variable.

Confounding Variable

An unmeasured or uncontrolled extraneous factor in an experimental design that can obscure or alter the observed results.

Replicates

Multiple identical experimental samples or repetitions used to ensure data reliability and account for natural variation.

Atomic Number

The value on the periodic table that specifies the exact number of protons contained in an atom's nucleus.

Mass Number

The combined total quantity of protons and neutrons located within the nucleus of an atom.

Radioactive Isotope

An unstable isotope of an element that spontaneously decays over time by emitting radiation, useful in biological tracking and research.

Monosaccharide

The most basic single sugar unit or monomer of carbohydrates, such as glucose.

Disaccharide

A double sugar molecule composed of two monosaccharides joined together by a chemical bond.

Polysaccharide

A complex carbohydrate polymer made of many linked monosaccharides, serving essential structural and energy roles in plants and animals.

Phospholipid

A key lipid molecule consisting of a glycerol backbone, two fatty acid tails, and a phosphate group, forming essential cellular membranes.

Polypeptide

A polymer chain constructed from amino acid monomers linked together by peptide bonds.

ATP

Adenosine triphosphate, a high-energy nucleotide molecule that functions as the primary direct energy source within cells.

Proximate Causes

Immediate genetic, physiological, or environmental mechanisms that directly explain how an animal behavior occurs.

Ultimate Causes

Evolutionary reasons and adaptive benefits that explain why an animal behavior evolved over generations.

Imprinting

A form of rapid, environmentally influenced learning occurring during a specific critical period early in an animal's life.

Classical Conditioning

A type of associative learning where an organism pairs an involuntary response with a neutral stimulus.

Operant Conditioning

A type of associative learning where an animal modifies a voluntary behavior based on consequences such as rewards or punishments.

Territoriality

An evolved behavior in which an organism defends a specific physical area against competitors to secure vital resources.

Sexual Selection

A mode of natural selection favoring traits that improve an individual's ability to secure mates, giving rise to female mate choice and male competition.

Altruism

A social behavior that reduces an individual's direct individual reproductive success while increasing the fitness of another member in the society.

Exponential Growth Pattern

An accelerating population growth pattern that occurs when resources are essentially unlimited.

Logistic Growth Pattern

A realistic population growth pattern that slows down as the population size reaches environmental carrying capacity.

Density Dependent Factors

Environmental influences whose effects on population growth change in proportion to the density of the population.

Density Independent Factors

Environmental factors, such as weather events, that affect population mortality regardless of population density.

Autotrophs

Organisms capable of producing their own nutrients from inorganic energy sources like light or chemicals.

Heterotrophs

Organisms that must obtain nutrients by consuming other living or dead organisms.

Biogeochemical Cycle

The pathways through which chemical nutrients move between living organisms and non-living components of ecosystems.