Unit 2 Flashcards

(4 cards)

1
Q

Suggest why the lock-and-key and induced-fit explanations are termed models. (1)

A

idea of simple representation of the , process / structure
or
idea of showing people how it works ;

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2
Q

Suggest why most scientists now accept the induced-fit model rather than the lock-and-key model. (1)

A

supported by , more evidence / new research /
more work ;
idea of fitting evidence more closely (than lock & key) ;

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3
Q

Suggest how a more flexible structure might help this enzyme work faster at lower temperatures. (1)

A

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 ;

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4
Q

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)

A
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 ;
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