An enzyme has a Vmax of 50 micromol product formed (minute x mg protein)-1 and a Km of 10 microM for the substrate. When a reaction mixture contains the enzyme and 5 microM substrate, which of the following percentages of the maximum velocity will be closest to the initial reaction rate?

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#Question id: 12042

#Unit 7. System Physiology – Animal

A 19-year-old woman visits her physician because of nausea, diarrhea, light headedness, and flatulence. The physician administers 50 g of oral lactose at time zero, and measures breath hydrogen every 30 min for 3 hr using a hand-held monitor. The results are shown above. Which of the following best describes this patient’s condition?

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#Question id: 15409

#Unit 8. Inheritance Biology

 A heterozygous trihybrid corn plant is testcrossed and the following progeny are produced (all traits are recessive to their wildtype alternative);

          booster                              6

          booster, silkless                  137       

          booster, liguleless, silkless      291

          liguleless                          142

          liguleless, silkless                  3

          silkless                            30

          booster, liguleless                  34

          wildtype                            339

What is the order of the loci on the chromosome? 

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#Question id: 4716

#Unit 11. Evolution and Behavior

Which of the following is correct match?

A	Wallace	I	Changes in allele frequency due to random genetic drift
B	Sewall Wright	II	Evolution by natural selection
C	Carl Woese	III	hybrid sterility
D	Haldane’s rule	IV	DNA sequencing led to molecular phylogenetics

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#Question id: 23527

#Unit 1. Molecules and their Interaction Relevant to Biology

Humans interfere with the natural phosphorus cycle by

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#Question id: 11573

#Unit 7. System Physiology – Animal

Removing which of the following glands would have the most wide-reaching effect on bodily functions of an adult human?