Which structure below indicates the proper hydrogen-bonding pattern between amino acids in an α-helix? (Dashed lines represent the hydrogen bonds.)

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#Question id: 27636

#Unit 1. Molecules and their Interaction Relevant to Biology

Each single strand of the beta-sheet structure can be pictured as a twofold helix, that is, a helix with

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#Question id: 11933

#Unit 7. System Physiology – Animal

The excitatory or inhibitory action of a neurotransmitter is determined by which of the following?

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#Question id: 22966

#Unit 7. System Physiology – Animal

Which cells contains receptor for PTH?

a. osteoclasts

b. osteoblasts

c. preosteoclasts

d. osteocytes

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#Question id: 31282

#Unit 2. Cellular Organization

In which of the following condition premature mitotic CDK activation and premature entry into mitosis are seen? 

a) Gain-of-function of wee1 kinase

b) Loss-of-function of wee1 kinase

c) Gain-of-function of cdc25 phosphatase

d) Loss-of-function of cdc25 phosphatase

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#Question id: 19237

#Unit 12. Applied Biology

A type of structure, which may act as a transcription termination signal is