Double-negative (DN) thymocytes that have successfully rearranged their TCRβ chains are valuable, and are identified and expanded via a process known as 

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#Question id: 11430

#Unit 2. Cellular Organization

For GLUT1 in the human erythrocyte membrane, the Km for glucose transport is 1.5 mM. Thus when the extracellular glucose concentration is 1.5 mM, roughly half the GLUT1 transporters with outward-facing binding sites will have a bound glucose, and transport will occur:

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#Question id: 354

#Unit 1. Molecules and their Interaction Relevant to Biology

You have a freshly prepared 0.1 M sucrose (molecular mass 342) solution, which means ________.

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#Question id: 11284

#Unit 10. Ecological Principles

Which of the following could qualify as a top-down control on a grassland community?

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#Question id: 622

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme-catalyzed reaction was carried out with the substrate concentration initially a thousand times greater than the Km for that substrate.  After 9 minutes, 1% of the substrate had been converted to product, and the amount of product formed in the reaction mixture was 12 micromol.  If, in a separate experiment, one-third as much enzyme and twice as much substrate had been combined, how long would it take for the same amount (12 micromol) of product to be formed?

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#Question id: 23916

#General Aptitude

Assertion (A): Bt cotton is a transgenic crop which has been introduced in India, but is being opposed on environmental grounds. Reason (R): CrylAc protein in Bt cotton has been found to be toxic and allergenic to human beings.