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Biology Top 101
Cells
36
Biology
10th Grade
11/29/2010

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Term
prokaryotic cells
Definition
Simple, no membrane bound organelles, bacteria only, one circular chromosome
Term
eukaryotic cells
Definition
membrane bound organelles, plants and animals, true nucleus containing chromosomes
Term
nucleus
Definition
control center, contains chromosomes
Term
mitochondria
Definition
"powerhours" of the cell, produces energy in the form of ATP, site of aerobic respiration
Term
choloplast
Definition
site of photosynthesis, plant cells ONLY, contains the pigment chlorophyll
Term
vacuole
Definition
storage of excess materials, plant cells usually contain only one
Term
ribosomes
Definition
proteins are synthesized, bound in both prokaryotes and eukaryotes
Term
cell wall
Definition
plant cells ONLY, surrounds cell and provides support and protection, made of cellulose
Term
plasma membrane
Definition
also called cell membrane, surrounds cell, regulates what enter/leaves the cell, helps maintain homeostatis, made of phospholipids with embedded proteins
Term
cell organization
Definition
cell * tissue * organ * organ system * individual organism
Term
diffusion
Definition
form of passive transport (NO ENERGY NEEDED) across a membrane, solutes move from an area of high concentration to low concentration
Term
osmosis
Definition
diffusion of water (also passive transport)
Term
active transport
Definition
particles moving against the concentration gradient which REQUIRES ENERGY (ATP), low concentration to high concentration
Term
ATP
Definition
energy storing molecule, can be used for quick energy by the cell, energy is stored in the phosphate bonds
Term
photosynthesis
Definition
water and carbon dioxide used to produce glucose and oxygen, occurs in the chloroplast.
Term
aerobic respiration
Definition
used to release energy (ATP) for cellular use, occurs in the mitochondra
Term
anerobic respiration
Definition
does not require oxygen, also used to release energy, but not as efficient as aerobic respiration (less ATP)
Term
products of anaerobic respiration
Definition
carbon dioxide and lactic acid or alcohol
Term
two types of anaerobic respiration
Definition
alcohol fermentation and lactic acid fermentation
Term
autotroph
Definition
obtain evergy from the environment, photosynthesis or chemosynthesis, "producers"o
Term
heterotroph
Definition
obtain energy from other living things, "consumers"
Term
DNA/RNA
Definition
carry genetic information, made of a chain of nucleotides, nucleotides contain a sugar, phosphate, and a nitrogen base
Term
DNA
Definition
double stranded, "double helix", four base pairs: ATGC, sugar is deoyribose, found in nucleus
Term
RNA
Definition
single stranded, four base pairs: AUCG, sugar is ribose
Term
base pair rule
Definition
In DNA, adenin always pairs with thymine, and guanine always pairs with cytosine
Term
transcription
Definition
DNA - mRNA, occurs in the nucleus, complementary mRNA strand is produced from a segment of DNA
Term
translation
Definition
connects amino acids in the correct order to make a protein, occurs in the cytoplasm within the ribosomes
Term
codon
Definition
sequence of three mRNA nucleotides that code for an amino acid Ex: TCC
Term
mutations
Definition
change in DNA code, may cause a change in protein produced, not always harmful Ex: sickle cell mutation
Term
mitosis
Definition
cell division, produces two identical diploid daughter cells, occurs in body cells to grow and reapir
Term
cancer
Definition
error in cell growth with causes uncontrolled cell growth, has environment and genetic variables
Term
meiosis
Definition
cell division, produces four different haploid daughter cells (gametes), occurs in sex cells to form gametes
Term
crossing over
Definition
homologuous chromosomes exchange parts fo their DNA, creates variation in gametes
Term
nondisjuction
Definition
homologous chromosomes fail to separate during meiosis, can lead to Down Syndrome, Turners Syndrome, and Klinefelters Syndrome
Term
asexual reproduction
Definition
one parent, identical offspring, variation only thru mutations, Ex: budding, fragmentation, fission
Term
sexual reproduction
Definition
two parents, offspring different from parents, more variation, fertiilization (fusion of gametes)
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