Which of the following statements is TRUE of superantigens?

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#Question id: 6949

#SCPH01 Biochemistry

During gastrulation in Xenopus, the future mesoderm and endoderm move inside the embryo through the "blastopore"; in contrast, in chickens, gastrulation involves cells moving inward through the:

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#Question id: 1036

#SCPH28 | Zoology

A urine sample with more than 100,000 organisms is considered indicative of infection. A urine sample containing 5,000 bacteria, with a generation time of 30 minutes, sits for 3 hours before finally being assayed. How many bacteria will then be present within the sample?

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#Question id: 10986

#SCPH06 I Botany

Which of the following conditions at the A-V node will cause a decrease in heart rate?

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#Question id: 12372

#SCPH28 | Zoology

In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a  single species dominated the field. A possible factor in this secondary succession was

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#Question id: 3008

#SCPH28 | Zoology

The structures present in the hay infusions used in experiments on spontaneous generation that made them difficult to sterilize are