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Science Midterm2

Terms

undefined, object
copy deck
chromosomes
thread like structures that have genetic info that is passed down from one generation to the next
omnivore
an animal that feeds on both animal and vegetable substances
nucleus
a part of the cell containing DNA and RNA and responsible for growth and reproduction
carnivore
any animal that feeds on flesh
cellular respiration
Releases energy by breaking down glucose and other food molecules in presence of oxygen
difusion
process by which molecules tend to move from an area where they are more conetrated to an area where they are more concentrated to an area where they are less concentrated
photosynthesis
the process by which plants and some other organisms use light energy to power chemical reactions that convert water and carbon dioxide into oxygen and high energy carbohydrates such as sugars and starches
protist
one- or many- celled eukaryotic organism that can be plantlike, animal-like, or funguslike
Darwin
English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
dna structure
DNA consists of two long chains of nucleotides twisted into a double helix and joined by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine
sexual reproduction
reproduction involving the union or fusion of a male and a female gamete
producer
can make their own food
consumer
organisms that take in food material and are above producers on the energy pyramid
decomposer
eats and breaks down dead matter
active transport
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient
reletive dating
determaining wheather objects are older or younger then other objects
ecosystem
a system formed by the interaction of a community of organisms with their physical environment
passive transport
transport of a substance across a cell membrane by diffusion
meiosis
(genetics) cell division that produces reproductive cells in sexually reproducing organisms
asexual reproduction
new organism formed from a single parent
microbe
an invisable organism to the naked eye, espesially one that causes disease
replication
the act of making copies
evolution
the process by which populations accumulate inherrited changes over time
herbivore
any animal that feeds chiefly on grass and other plants
osmosis
the diffusion of water through a cell membrane
natural selection
a natural process resulting in the evolution of organisms best adapted to the environment
mitosis
in eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes
niche
a position particularly well suited to the person who occupies it
nucleotide
The base units of nucleic acids, each containing a sugar, a phosphate group, and one of four nitrogenous bases.
organelle
membrane bound structure inside a cell that performs a specific function

Deck Info

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