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Higher Biology - Chapter 28-29
Glossary
20
Biology
Not Applicable
04/30/2011

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Term
adolescent growth spurt
Definition
Rapid phase of human growth during puberty
Term
continuous
Definition
Describing a smooth growth pattern
Term
dry mass
Definition
Reliable indicator of growth
Term
ecdysis
Definition
Moulting of skin by an insect to allow its body length to increase
Term
exoskeleton
Definition
Hard inelastic skin preventing continuous increase in length of an insect’s body
Term
fresh mass
Definition
Unreliable indicator of growth
Term
infant growth spurt
Definition
Rapid phase of human growth during early childhood
Term
intermittent
Definition
Describing a continuous growth pattern
Term
sigmoid growth curve
Definition
S-shaped graph showing an organism’s four periods of growth
Term
differentiation
Definition
Process of cell specialisation involving the selective switching off or on of certain genes
Term
enzyme
Definition
Protein molecule which acts as a biological catalyst
Term
inducer
Definition
Molecule which prevents a repressor molecule from blocking an operon
Term
metabolism
Definition
Sum of all the chemical reactions occuring within a living organism
Term
metabolite
Definition
Substance that takes part in a metabolic process by being the produce of one enzyme and the substrate of another
Term
mutation
Definition
A change in an organism’s genetic material
Term
operator
Definition
Region of DNA which acts as a site for attachment
Term
phenylketonuria
Definition
Genetically inherited condition in which the sufferer lacks the enzyme needed to convert phenylalanine to tyrosine
Term
regulator gene
Definition
Region of DNA which codes for a repressor molecule
Term
repressor
Definition
Molecule coded for by a regulator gene which can bind with an operator gene
Term
structural gene
Definition
Region of DNA which codes for a function protein (e.g an enzyme)
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