The toxic shock syndrome toxin is produced by some Salmonella species when there is not sufficient iron present. When iron is present, it prevents transcription of the TSS-toxin gene. Iron therefore serves as __________.

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#Question id: 19498

#XL - P Chemistry

Which of the following pairs represents isobars?

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#Question id: 1678

#XL - Q Biochemistry

What does the MHC class I heavy chain consists of?

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#Question id: 2140

#XL - Q Biochemistry

According to the current model for HIV infection, which of the following is not involved in the process of membrane fusion?

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#Question id: 11583

#XL - T Zoology

Use the figure to answer the following question.

In an experiment, rats' ovaries were removed immediately after impregnation, and then the rats were divided into two groups. Treatments and results are summarized in the table. The results most likely occurred because progesterone exerts an effect on the ________.

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#Question id: 27583

#XL - U Food Technology

Which of the Following is not an amino acid ?