EOC Flashcards
movement of molecules across a membrane requiring energy to be expended by the cell
active transport
energy needed to start a chemical reaction; lowered by enzymes
Activation energy
inherited characteristic that increases an organism’s chance of survival
adaptation
the different forms of a gene; could be dominant or recessive
allele
basic building blocks of proteins
amino acid
structures that do not have a common evolutionary origin but are similar in form or function
analogous structures
the third phase of mitosis, during which the chromosome pairs separate and move toward opposite poles
anaphase
compound that blocks the growth and reproduction of bacteria
antibiotic
a substance produced by the body that destroys or inactivates a pathogen that has entered the body
antibody
substance (usually foreign) that stimulates the production of an antibody
antigen
domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan
archaea
a nucleotide that stores and transfers energy within cells
ATP
organism that can capture energy from sunlight or chemicals and use it to produce its own food; also called a producer
autotroph
domain of unicellular prokaryotes that have cell walls containing peptidoglycans
bacteria
virus that infects bacteria
bacteriophage
mutation which results in the loss of nucleotide pairs in a gene; have a major effect on the resulting protein
base deletion
mutation which results in the addition of nucleotide pairs in a gene; have a major effect on the resulting protein
base insertion
a type of point mutation where one nucleotide and its partner are replaced by another pair of nucleotides
base-pair substitution
an inherited behavior that helps an organism survive; like escaping from predators or find a mate
behavioral adaptation
asexual reproduction in prokaryotes by which one cell divides into two identical cells
binary fission
an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal
fetus
a rise in the temperature of the body
fever
the ability of an individual to survive and reproduce in its specific environment
fitness
a series of steps in which organisms transfer energy by eating and being eaten
food chain
a diagram that shows the feeding relationships between organisms in an ecosystem
food web
the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
fossil
egg or sperm sex cell that contains a single set of chromosomes (haploid), one from each homologous pair
gamete
sequence of DNA that codes for a protein and thus determines a trait
gene
Classification system in which each species is assigned a two-part scientific name including the genus and species
binomial nomenclature
the variety of different species in a given area
biodiversity
process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another; like the carbon and nitrogen cycle
biogeochemical cycle
the total amount of living matter within a given trophic level
biomass
the outer covering of protein surrounding the nucleic acid of a virus
capsid
organic compound used by cells to store and release energy; composed of carbon, hydrogen, and oxygen
carbohydrate
the organic circulation of carbon from the atmosphere into organisms and back again
carbon cycle
a consumer that only eats other consumers
Carnivores
substance that speeds up the rate of a chemical reaction; like an enzyme
catalyst
basic unit of life
Cell
the cycle of growth and reproduction of a cell, consisting of interphase (g1, s, g2) and mitosis (division of the nucleus-prophase, metaphase, anaphase, and telophase) and cytokinesis (division of cytoplasm)
cell cycle
the process by which a cell divides into two new daughter cells
cell division
The lipid bilayer that forms the outer boundary of the cell
cell membrane
a rigid structure that surrounds the cell membrane and provides support to the cell; made of carbohydrates
cell wall
process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
cellular respiration
organize the spindle fibers to separate chromosomes during animal cell mitosis
centriole
area where the chromatids of a chromosome are attached
centromere
green pigment in plants that absorbs light energy used to carry out photosynthesis
chlorophyll
one of two identical “sister” parts of a duplicated chromosome
chromatid
a model of evolution in which gradual change over a long period of time leads to biological diversity
gradualism
Pairs of cells that surround stomata and control their opening and closing.
guard cell
the place where an organism lives
habitat
half the normal number of chromosomes; found in sex cells
haploid number
consumer that eats only producers; also called a primary consumer
herbivore
having two different alleles for a trait
heterozygous
process by which organisms maintain a relatively stable internal environment
Homeostasis
condensed threads of genetic material formed from chromatin as a cell prepares to divide
chromosome
a relatively stable long-lasting community reached in a successional series
climax community
in RNA, a three-base “word” that codes for one amino acid
codon
symbiotic relationship in which one member of the association benefits and the other is neither helped nor harmed
commensalism
the struggle between organisms to survive in a habitat with limited resources
competition
difference in concentration of a substance on two sides of a membrane
concentration gradient
a summary of what you have learned from an experiment
conclusion
an organism that obtains energy by feeding on other organisms
consumer
exchange of genetic material between homologous chromosomes during prophase I of meiosis
crossing over
division of the cytoplasm
cytokinesis
a jellylike fluid inside the cell in which the organelles are suspended
cytoplasm
information gathered from observations
data
organism that breaks down and obtains energy from dead organic matter
decomposer
the removal of trees
Deforestation
process in which cells become specialized in structure and function
Differentiation
the process by which molecules move from an area of higher concentration to an area of lower concentration; passive
Diffusion
genetic cross using two traits with two alleles each
dihybrid cross
cell condition in which two of each type of chromosome are present
Diploid number
A discrete event that disrupts an ecosystem or community. Examples of natural disturbances include fires, hurricanes, tornadoes, droughts, and floods. Examples of human-caused disturbances include deforestation, overgrazing, and plowing.
Disturbance
deoxyribonucleic acid, the material that contains the information that determines inherited characteristics
DNA
large taxonomic group, consisting of closely related phyla
Kingdom
a behavior an animal learns from its parents
Learned behavior
macromolecule made mainly from carbon and hydrogen atoms; includes fats, oils, and waxes
Lipids
cell organelle filled with enzymes needed to break down certain materials in the cell
lysosome
any large complex organic molecule
macromolecule
Cell division that produces reproductive cells in sexually reproducing organisms
Meiosis
messenger RNA; type of RNA that carries instructions from DNA in the nucleus to the ribosome
MRNA
second phase of mitosis, during which the chromosomes line up across the center of the cell
Metaphase
Most inclusive taxonomic category; larger than a kingdom
Domain
gradual change in living communities that follows a disturbance
ecological succession
Female sex cell
Egg
organism in its early stage of development
embryo
study of multicellular organisms as they develop from fertilized eggs to fully formed organisms
embryology
process by which a cell takes in a substance by surrounding it with the cell membrane; active transport
endocytosis
a system of membranes that is found in a cell’s cytoplasm and that assists in the production, processing, and transport of proteins and in the production of lipids
endoplasmic reticulum
a diagram that shows the amount of energy that moves from one feeding level to another in a food web
energy pyramid
protein that speeds up a chemical reaction
Enzyme
A cell that contains a nucleus and membrane bound organelles
eukaryote
rapid growth of algae in bodies of water, due to high levels of nitrogen and often phosphate
eutrophication
the gradual change in a species over time
Evolution
process by which vesicles release their contents outside the cell; active transport
exocytosis
movement of specific molecules across cell membranes through protein channels; passive transport
facilitated diffusion
a long chain of smaller molecules called nucleotides; DNA and RNA
nucleic acid
monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
Nucleotides
new combination of genetic information in a gamete as a result of crossing over during prophase I of meiosis
Genetic recombination
response to the earth’s gravity, as the growing of roots downward in the ground
Geotropism
separation of species or populations so that they cannot interbreed and produce fertile offspring
reproductive isolation
the random distribution of the pairs of genes on different chromosomes to the gametes
independent assortment
A disease that is caused by a pathogen and that can be spread from one individual to another.
infectious disease
when the concentration of two solutions is the same
isotonic
a species that influences the survival of many other species in an ecosystem
keystone species
Any cell in a multicellular organism except a sperm or egg cell.
somatic cell
parts of an organism that are no longer functioning and do not affect survival
vestigial structure
the vascular tissue through which water and nutrients move in plants
xylem
fertilized egg
Zygote
diagram showing evolutionary relationships of organisms with a common ancestor; resembles a tree
phylogenetic tree
The study of evolutionary relationships among organisms
phylogeny
pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
punctuated equilibrium