Which of the following microscopy uses photoswitchable fluorophores that can be switched between a "on" (fluorescent) and "off" (dark) state, allowing only a small subset of molecules to be illuminated at a time, enabling precise localization of each individual molecule.

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#Question id: 2175

#Unit 2. Cellular Organization

 ABC superfamily proteins are thought to act as ATP-dependent flippases in transporting:

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#Question id: 50

#Unit 1. Molecules and their Interaction Relevant to Biology

The enzyme fumarase catalyzes the reverse hydration of fumaric acid to l-malate, but it will not catalyze the hydration of maleic acid, the cis isomer of fumaric acid. This is an example of:

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#Question id: 31404

#Unit 7. System Physiology – Animal

Which of the following substances must be digested before being absorbed by the small intestine? 

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#Question id: 26558

#Unit 3. Fundamental Processes

Which of the following is correct

A. Cas1 is  integrase 

B. Cas2 is a ribonuclease

C. Cas6 is involved in expression and processing of the CRISPR cluster

D. Cas3 in the interference of viral infection

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#Question id: 12204

#Unit 6. System Physiology – Plant

Feedback regulation represents another key mechanism employed to attenuate a response such as

a) AUX/IAA proteins can bind to the promoters of their own genes and repress their own expression

b) auxin signaling triggers the degradation of AUX/IAA repressors, the ensuing transcription of auxin response genes leads to the replacement of AUX/IAA proteins and thus to response attenuation or termination

c) AUX/IAA genes, which encode the AUX/IAA auxin repressor proteins, have auxin response element binding sites located in their promoter regions

During the feedback regulation mechanism of auxin several responses are trigger, find out the correct sequences of these responses.