Ptosis (droopy eyelid) may be inherited as a dominant human trait. Among 30 people who are heterozygous for the ptosis allele, 10 have ptosis and 20 have normal eyelids. What is the penetrance for ptosis?

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#Question id: 563

#XL - Q Biochemistry

Both water and glucose share an —OH that can serve as a substrate for a reaction with the terminal phosphate of ATP catalyzed by hexokinase.  Glucose, however, is about a million times more reactive as a substrate than water.  The best explanation is that:

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#Question id: 564

#XL - Q Biochemistry

A good transition-state analog:

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#Question id: 565

#XL - Q Biochemistry

A transition-state analog:

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#Question id: 566

#XL - Q Biochemistry

The role of the metal ion (Mg2+) in catalysis by enolase is to

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#Question id: 567

#XL - Q Biochemistry

Penicillin and related drugs inhibit the enzyme; this enzyme is produced by 

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#Question id: 568

#XL - Q Biochemistry

Which of the following statements about allosteric control of enzymatic activity is false?