Several of the different globin genes are expressed in humans, but at different times in development. What mechanism could allow for this?

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#Question id: 4570

#11. Evolution and Behavior

Which pair would probably have agreed with the process that is depicted by this tree?

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#Question id: 10813

#6. System Physiology – Plant

A living cytoplasmic connection penetrate the walls between sieve tube elements and their companion cells; which are often complex and branched on the companion cell side, known as

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#Question id: 2955

#2. Cellular Organization

Cyclin is to MPF as ............ is to cyclin-dependent kinases.

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#Question id: 11194

#7. System Physiology – Animal

The "threshold" potential of a membrane is the ________.

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#Question id: 18376

#12. Applied Biology

Increase in iron content of the plants treated with B. subtilis volatiles is correlated with