DNA polymerases fall into five families based on sequence homologies; the palm is well conserved among them, but the thumb and fingers provide analogous secondary structure elements from different sequences.

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#Id: 3396

#Unit 3. Fundamental Processes

The genes encoding the translesion polymerases are expressed as part of a pathway known as the SOS response. 

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#Id: 3095

#Unit 3. Fundamental Processes

Once replication has started, it continues until the entire genome has been duplicated.

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#Id: 9939

#Unit 4. Cell Communication and Cell Signaling

Tuberculosis

Tuberculosis, caused by Mycobacterium tuberculosis.

Pulmonary infection usually results from inhalation of small droplets of respiratory secretions containing a few bacilli.

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#Id: 8444

#Unit 1. Molecules and their Interaction Relevant to Biology

Both the pi helix and the 310 helix occur rarely and usually only at the ends of a helices or as single-tum helices. They are not energetically favorable, since the backbone atoms are too tightly packed in the 310 helix and so loosely packed in the n helix that there is a hole through the middle. 

Only in the a helix are the backbone atoms properly packed to provide a stable structure.

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#Id: 1260

#Unit 7. System Physiology – Animal

The cells of the adrenal cortex contain large amounts of smooth endoplasmic reticulum, which is involved in the steroid-forming process.