Biology Test 1 Concepts

67 terms by ShiftyCapone 

Create a new folder

Advertisement Upgrade to remove ads

concepts

6 kingdoms life can be organized into

 Archaea, Bacteria, protista, fungi, plantae, animalia

5 basic properties which serve to define life

Cellular organization, Metabolism,homeostasis, growth and reproduction, and heredity

Cellular Organization

All living things are composed of one or more cells

Metabolism

the transfer of energy from one form to another

homeostasis

organisms act to try to keep their interior systems relatively constant

growth and reproduction

all living organisms grow and reproduce themselves

heredity

DNA: long molecule, each set of instructions in DNA is called a gene

Cell

a tiny compartment with a thin covering called a membrane. Some cells are simple while others are complex

ATP molecules

special energy carrying molecules

3 organization levels of life

cellular level, organism level, and population level

Cellular level

hierarchy or increasing complexity within cells

5 organization levels of hierarchy in the cellular level

Atoms, molecules, macromolecules, organelles, cells

atoms

fundamental elements of matter

molecules

atoms that are joined together into complex clusters

macromolecules

large complex molecules (DNA)

organelles

complex biological molecules are assembled into tiny compartments within cells called organelles. The nucleus is an organelle within which the cell's DNA is stored

cells

organelles and other elements that are assembled into membrane bounded units

4 levels of organization in the organism level

tissues, organs, organ systems, and organisms

Tissues

most basic level, groups of similar cells that act as a functional unit

Organs

grouped tissues, body structures composed of several different tissues grouped together in a structural and functional unit

Organ systems

group of organs

Organisms

separate organ systems function together to form an organism

4 levels of organization at the population level

population, species, community, ecosystem

population

a group of organisms of the same species living in the same place

species

all the populations of a particular kind of organism together form a ____, its members similar in appearance and able to interbreed.

community

consists of all the populations of different species living together in one place

ecosystem

highest tier, a biological community and the soil and water within which it lives together = ecological system

emergent properties

result from the way components interact, and often cannot be guessed just by looking at the parts themselves, properties that were not present at the simpler level of organization.

functional properties

emerge from more complex organization

5 biological themes

evolution, the flow of energy, cooperation, structure determines function, and homeostasis

Evolution

a genetic change in species overtime

The flow of energy

all of the energy used by most organisms comes from the sun and is passed in one direction through ecosystems

cooperation

Symbiosis: organisms of two different species that live in direct contact, form a type of relationship

structure determines function

biological structures are very well suited to their functions.

homeostasis

the high degree of specialization we see among complex organisms is only possible because these organisms act to maintain a relatively stable internal environment

History of evolution

Charles Darwin was an English naturalist who, in 1859, proposed the idea that this change is a result of a process called Natural selection

Natural selection

Those organisms whose characteristics make them better able to survive the challenges of their environment live to reproduce, passing their favorable characteristics onto their offspring.

Artificial Selection

breeding exaggerated characteristics

deductive reasoning

Making individual decisions by applying a guide of accepted general principles, using general principles to explain specific observations

inductive reasoning

discovering general principles by careful examination of specific cases

hypothesis

a possible explanation

6 steps of the scientific process

1. observation 2. hypothesis 3. predictions 4. testing 5. controls 6. conclusion

predictions

expected consequences

variable control

a factor that might influence a process

Control experiment

don't alter the variable

theory

a collection of related hypothesis that have been tested many times and not rejected

The four theories that unify science as biology

the cell theory, the gene theory, the theory of evolution, and the theory of heredity

The cell theory

1. All organisms are made up of cells 2. All cells must come from pre-existing cells. 3. The cell is the basic unit of all living things.

The gene theory

DNA coded in genes contains the blueprint for protein expression and proteins are the foundation for cellular structure and function

Gene

specific sequences of several hundred to many thousand nucleotides

the theory of evolution

advanced by Charles Darwin in 1859, attributes the diversity of the living world to natural selection. Those organisms best able to respond to the challenges of living will leave more offspring, and this their traits become more common in the population.

the theory of heredity

first advanced by Gregor Mendel in 1865 states that the genes of an organism are inherited as discrete units

Three main domains

Bacteria, Archaea, and eukarya

Atoms

o All substances are composed of tiny particles called atoms. Every atom is composed of a positively charged nucleus around which orbit negative electrons. The electrons determine how an atom will interact with other atoms. Most atoms also contain electrically neutral particles called neutrons.

o Atoms, the smallest particles into which a substance can be divided. Are composed of electrons orbiting a nucleus composed of protons and neutrons. Electrons determine the chemical behavior of atoms.

Ions and Isotopes

o An atom with an unequal number of protons and electrons is an ion. An ion can be positively charged or negatively charged. Atoms with the same number of protons but different numbers of neutrons are isotopes.

o When an atom gains of loses one or more electrons, it is called an ion. Isotopes of an element differ in the number of neutrons they contain, but all have the same chemical properties.

Molecules

o Atoms are linked together into molecules, joined by chemical bonds. There are three types of chemical bonds: ionic bonds where oppositely charged ions are attracted to each other; covalent bonds, where bonds form by the sharing of electrons; and hydrogen bonds, where polar molecules are attracted by opposite partial charges on different molecules.

o Molecules are atoms linked together y chemical bonds. Ionic bonds, covalent bonds, and hydrogen bonds are the three principal types of bonds, and van Der Waals interactions are weaker forces.

Hydrogen bonds give water unique properties

o Water forms weak chemical associations called hydrogen bonds that are responsible for much of the organization of living chemistry

o Water molecules form a network of hydrogen bonds in liquid and dissolve other polar molecules. Many of the key properties of water arise because it takes considerable energy to break liquid water's many hydrogen bonds.

Water Ionizes

o Water molecules dissociate, forming low concentrations of hydrogen and hydroxide ions. The concentration of hydrogen ions in solution is measured as pH. Buffers control the pH of a solution by regulating the concentration of hydrogen ions in the solution

o A tiny fraction of water molecules spontaneously ionize at any moment, forming H+ and OH-. The pH of a solution is a measure of its H+ concentration. Low pH values indicate high H+ concentration (acidic solutions), and high pH values indicate low H+ concentration (basic solutions).

The invention of the Linnaean system

o Biologists name organisms using a two word "binomial" system

o Two part (binomial) Latin names, first used by Linnaeus, are now universally employed by biologists to name particular organisms.

Species Names

o Every kind of organism is assigned a unique Latin name

o By convention, the first part of a binomial species name identifies the genus to which the species belongs, and the second part distinguishes that particular species from other species in the genus

Higher Categories

o The higher groups into which an organism is placed reveal a great deal about the organism

o A hierarchical system is used to classify organisms, in which higher categories convey more general information about the group.

What is a species

o Species are groups of similar organisms. Animal species tend not to interbreed with individuals of other species, while plants often do so.

o Among animals species are generally defined as reproductively isolated groups; among the other kingdoms such a definition is less useful, as their species typically have weaker barriers to hybridization.

How to build a family tree

o Traditional and cladistic interpretations of an organisms evolutionary history differ in the emphasis they place on key traits

o A phylogeny may be represented as a cladogram based on the order in which groups evolved or as a traditional taxonomic tree that weights characters according to assumed importance

The kingdoms of life

o Living organisms are placed into three large groups called domains, and within domains they are placed in to kingdoms

o Living organisms are grouped into three categories called domains. One of the domain, eukarya, is divided into four kingdoms: protista, fungi, plante, and animalia

domain bacteria

o The prokaryotes in this domain are more numerous than any other organism

o Bacteria are as different from Archaea as they are from eukaryotes

domain Archaea

o This domain consists of primitive prokaryotes that often live in extreme environments

o Archaea are unique prokaryotes that inhabit diverse environments, some of them extreme

Domain Eukarya

o There are four kingdoms of eukaryotes, all characterized by complex cellular interiors, and three of them are entirely or predominantly multicellular.

o Eukaryotic cells acquired mitochondria and chloroplasts by endosymbiosis. The organisms in the domain Eukarya are divided into four kingdoms: fungi, plants, animals, and protists.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set