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Midterm
70 terms from my Biology Midterm Exam
70
Biology
9th Grade
01/16/2008

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Term
multicellular
Definition
more than one cell
Term
cell
Definition
building blocks of life
Term
unicellular
Definition
one cell
Term
metabolism
Definition
sum of all chemical processes occurring in the cell
Term
homeostasis
Definition
organism's ability to maintain stable conditions
Term
heredity
Definition
transmission of genetic traits from parents to offspring
Term
cell theory
Definition
cells come only from existing cells (one part)
Term
microtubule
Definition
hollow protein fiber used for movement and support
Term
cytoskeleton
Definition
network of proteins responsible for support, movement, and shape of cell
Term
centriole
Definition
rod-shaped organelle which moves chromosomes during cell divisions
Term
carbohydrate
Definition
sugars, store and transport energy
Term
starch
Definition
substance that sugars are stored as
Term
glucose
Definition
C6 H12 O6 monosaccharide
Term
cellulose
Definition
fat
Term
saturated fat
Definition
lipid with no double bonds
Term
unsaturated fat
Definition
lipid with double bonds
Term
ATP
Definition
energy currency of living organisms
Term
lactic acid
Definition
product of anaerobic cell respiration and lactic acid fermentation
Term
pyruvate
Definition
product of glycolysis
Term
radiant energy
Definition
energy that is transmitted in waves and can travel through vacuums
Term
pigment
Definition
molecule containing atoms that let it absorb certain wavelengths of light
Term
carbon fixation
Definition
process where CO2 is is incorporated into organic compounds
Term
chemical reaction
Definition
process by which one or more molecules are changed into new substances
Term
free energy
Definition
energy that is available for work
Term
reactant
Definition
starting material in chemical reaction
Term
exergonic reaction
Definition
reaction that releases free energy
Term
endergonic reaction
Definition
reaction that absorbs free energy
Term
catalyst
Definition
substance that speeds up reactions without being used itself
Term
enzyme
Definition
catalyst for cell reactions
Term
substrate
Definition
molecule on which enzyme acts
Term
purine
Definition
adenine and guanine, double ring (larger)
Term
pyrimidine
Definition
thymine and cytosine, single ring (smaller)
Term
base pairing rules
Definition
adenine = thymine
cytosine = guanine
Term
deoxyribose
Definition
5-carbon sugar, part of DNA
Term
ribonucleic acid
Definition
type of nucleic acid, participates in protein synthesis
Term
transcription
Definition
DNA to RNA
Term
translation
Definition
RNA to proteins
Term
RNA polymerase
Definition
enzyme that carries out transcription
Term
point mutation
Definition
mutation where one or a few nucleotides are changed
Term
solute
Definition
lesser part of solution
Term
solvent
Definition
greater part of solution
Term
hypotonic
Definition
less solute
Term
hypertonic
Definition
more solute
Term
facilitated diffusion
Definition
transport of substances through membrane with help of carrier substances
Term
endocytosis
Definition
process where large materials are enveloped by cell
Term
exocytosis
Definition
discharge of large materials by cell
Term
homeostasis
Definition
keeping the inside of the cell stable
Term
gene
Definition
section of DNA that codes for protein/RNA
Term
chromosome
Definition
| shaped structure where genes are located
Term
chromatid
Definition
one part of an H shaped chromosome during division
Term
homologous chromosome
Definition
chromosomes similar in size, shape, genes
Term
autosome
Definition
chromosome not involved in determining sex
Term
helicase
Definition
enzyme that unwinds double helix
Term
crossing over
Definition
exchange of reciprocal segments of DNA in the beginning of meiosis
Term
diploid
Definition
cell with two homologues of each chromosome
Term
haploid
Definition
cell with one set of each chromosome
Term
reduction division
Definition
part of meiosis where number of chromosomes halves
Term
genetic recombination
Definition
rearrangement of genetic material
Term
genetics
Definition
study of heredity
Term
true breeding
Definition
displaying only one form of a particular trait in offspring
Term
P generation
Definition
plants that displayed only one form of a particular trait
Term
F1 generation
Definition
offspring from a cross of two variables
Term
F2 generation
Definition
offspring from crosses of F1 generation
Term
homozygous
Definition
individual with two identical copies of a gene
Term
heterozygous
Definition
individual with two different genes for a trait
Term
allele
Definition
alternative form of genes
Term
phenotype
Definition
observable characteristics of an organism
Term
genotype
Definition
genetic constitution of an organism, determined by set of alleles
Term
law of segregation
Definition
when pairs of genes separate in meiosis, each zygote receives one copy of gene
Term
law of independent assortment
Definition
pairs of genes separate independently during meiosis
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