The central bond in this case is the peptide bond, where rotation is constrained. The peptide bond is normally (99.6% of the time) in the trans configuration, constraining  to a value of w=+_180. For a rare cis peptide bond, w=0.

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#Id: 1449

#Unit 4. Cell Communication and Cell Signaling

Gap junctions permit the passage of molecules as large as 1.2 nm in diameter (molecules smaller than 1200 Da).

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#Id: 7980

#Unit 10. Ecological Principles

Organisms that are denser than their surrounding water, a variety of adaptations can either reduce an organism’s density or retard its rate of sinking.

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#Id: 6901

#Unit 8. Inheritance Biology

Chromosomes are classified into four basic

Metacentric chromosome

Submetacentric chromosome

Acrocentric chromosome

Telocentric chromosome

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#Id: 2025

#Unit 8. Inheritance Biology

Auxotrophs or Mutant bacterial strains can be isolated on the basis of their nutritional requirements.

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#Id: 8580

#Unit 2. Cellular Organization

In humans, three genes encode lamins: 

Lamins A and C (alternatively spliced gene) 

Lamins B1 and B2