What is the major long-term source of a foreign antigen in the body?

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#Question id: 1082

#SCPH28 | Zoology

Which of the following is a type of signaling in which a cells respond to substrate that they themselves release ?

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#Question id: 415

#SCPH05 I Biotechnology

Which one of the following compounds does not have a large negative free energy of hydrolysis?

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#Question id: 6950

#SCPH28 | Zoology

In mammalian development, the embryo will form from which population of cells?

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#Question id: 7761

#SCPH01 Biochemistry

Correct sets of genes are well known to be involved in aging and its prevention, and each set appears to be conserved between phyla and even kingdoms. 

a. DNA repair enzymes

b. proteins of the insulin signaling pathway

c. proteins in the mTORC1 signaling pathway

d. chromatin remodeling enzymes

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#Question id: 14313

#SCPH05 I Biotechnology

An industrial waste-water stream is fed to a stirred-tank reactor continuously and the cells are recycled back to the reactor from the bottom of the sedimentation tank placed after the reactor. The following are given for the system: F = 100 l/h; S0 = 5000 mg/l; mm = 0.25 h-1 ; Ks = 200 mg/l; α (recycle ratio) = 0.6; C (cell concentration factor) = 2; Y ^M _X/S = 0.4. The effluent concentration is desired to be 100 mg/l.  Determine the cell concentration in the reactor and in the recycle stream.

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