The number of protons that must be transferred to produce one complete rotation of the c ring is equal to the number of c subunits in the ring.

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#Id: 2056

#Unit 8. Inheritance Biology

Pleiotropism single gene controls more than one phenotypic effect

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#Id: 2993

#Unit 3. Fundamental Processes

The first DNA-synthesizing enzyme to be characterized was DNA polymerase I, which is a single polypeptide of 103 kD, The chain can be cleaved into two parts by proteolytic treatment.

The larger cleavage product (68 kD) is called the Klenow fragment. It is used in synthetic reactions in vitro, It contains the polymerase and the proofreading 3'-5'  exonuclease activities.

The small fragment (35 kD) possesses a 5 '-3' exonucleolytic activity, which excises small groups of nucleotides, up to - 10 bases at a time. This activity is coordinated with the synthetic/ proofreading activity. It provides DNA polymerase I with a unique ability to start replication in vitro at a nick in DNA.

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#Id: 395

#Unit 2. Cellular Organization

Relatively short length (30 bp) of DNA bound by H2A.H2B dimers is not sufficient to prepare the DNA for H3.H4 tetramer binding.

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#Id: 6984

#Unit 5. Developmental Biology

If a stem cell divides symmetrically, have the ability to produce either two stem cells (increasing the stem cell pool by one) or two committed cells (decreasing the pool by one). This is called symmetrical renewing or symmetrical differentiating.

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#Id: 2221

#Unit 11. Evolution and Behavior

Dryopithecus is considered as the common ancestor of the apes and man.