Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?

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#Question id: 548

#I Life Science/ Life Sciences Group – I-V

Which one of the following statements is true of enzyme catalysts?

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#Question id: 8896

#SCPH06 I Botany

Chordate pharyngeal slits appear to have functioned first as

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#Question id: 14493

#SCPH28 | Zoology

The probability of the horse A winning the race is 1/5 and the probability of the horse B winning the same race is 1/6, then the probability of one of the horse to win the race is

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#Question id: 15657

#SCPH06 I Botany

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium.

You next construct a MelA– MelB– double mutant, which gives the following behavior:

 

Which of your two models is consistent with this new data?

a) the MelA- MelB- double mutant is identical to the MelB- mutant

b) MelA- is epistatic to MelB-

c) MelB- is epistatic to MelA-

d) the MelA- MelB- double mutant is identical to the MelA- mutant

Which of the following is the correct prediction about the double mutants?

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#Question id: 262

#SCPH12 I Genetics

Changes in the topology and three-dimensional shape of B-DNA can result from