Flashcards in B3b-proteins And Mutations Deck (17)
What are proteins made of?
Long chains of amino acids
What are structural proteins?
Strengthens connective tissues
What are hormones?
Carry messages around the body
What are carrier molecules?
Transport smaller molecules
What are enzymes?
Control cell reactions
How are proteins made?
-amino acids coded for by a sequence of three bases in gene
-amino acids put together make a protein
What is a biological catalyst?
Substance that speeds up a reaction
What do enzymes do?
-catalyse chemical reactions in living cells (respiration,photosynthesis)
How do enzymes have a high specificity for their substrate?
They usually only work with one substrate
What is the lock and key mechanism?
-substrate fits into active site of enzyme
-enzyme unchanged after reaction
How do temperatures affect enzyme activity?
-low temperatures : lower collision rate, slower reaction
-high temperatures: enzymes and substrate have more energy, higher collision rate
Why do enzymes have an optimum temperature?
-If its too hot bonds golding enzymes will break
How does pH affect enzymes?
If its too high or low it interferes with bonds holding the enzyme together
What are sone examples of proteins?
What is Q10?
Shows how rate of reaction changes temperature
What is the equation for Q10?
Q10 = rate at higher temperature / rate at lower temperature