Unit 2 Flashcards
(4 cards)
Suggest why the lock-and-key and induced-fit explanations are termed models. (1)
idea of simple representation of the , process / structure
or
idea of showing people how it works ;
Suggest why most scientists now accept the induced-fit model rather than the lock-and-key model. (1)
supported by , more evidence / new research /
more work ;
idea of fitting evidence more closely (than lock & key) ;
Suggest how a more flexible structure might help this enzyme work faster at lower temperatures. (1)
easier for / increased chance of , substrate, entering active site ;
more bonds can form / greater surface area for contact
(between active site and substrate) ;
easier for active site to change shape (as part of induced fit) ;
the induced fit , will be easier / AW ;
Living organisms can also be classified into three groups called domains.
Outline the features of this system of classification compared with the five kingdom system. (3)
based on (differences in) , DNA / RNA / nucleic acids / polynucleotides ; idea that more accurately reflects origins (of prokaryotes / eukaryotes) ; (domain) divides / AW , prokaryotes ; idea that domain reflects differences / AW , between (eu)bacteria and archaea ; (domain) groups / AW , eukaryotes together ; idea that domain reflects the fact that there are similarities between eukaryotic kingdoms ;