In positive control of several sugar metabolism-related operons, the cAMP receptor protein (CRP) binds to DNA to stimulate transcription. Which of the following environmental conditions causes an increase in CRP activity in stimulating transcription?

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#Question id: 16479

#Unit 12. Applied Biology

Organotypic cultures are type of cultures which

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#Question id: 1740

#Unit 4. Cell Communication and Cell Signaling

Activation of resting B-cells by T-helper cells depends directly upon costimulatory interaction between:

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#Question id: 1199

#Unit 4. Cell Communication and Cell Signaling

If you break liver cells by homogenization, separate the broken cell membranes (particulate) from the cytoplasm (soluble), and add epinephrine to the soluble portion, the result will be:

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#Question id: 2972

#Unit 2. Cellular Organization

Match the following attachment (Column I) with definition(Column II).

Column I	Column II
A. Monotelic Attachment	I. When sister kinetochores attach to microtubules emanating from opposite spindle poles, they are stably attached.
B. Syntelic Attachment	II. When one kinetochore attaches to microtubules emanating from two opposite spindle poles.
C. Amphitelic Attachment	III. When both sister kinetochores attach to microtubules emanating from the same spindle pole.
D. Merotelic Attachment	IV. When only one of the two sister kinetochores attaches to microtubules.

Which of the following is correct?

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#Question id: 31273

#Unit 2. Cellular Organization

The Cip/Kip family members bind to cyclin-bound CDKs and block the activity of which of the following cyclins complexes ?