Principles of stem cell regulation including extracellular mechanism which define the physical and chemical regulation, which of the following statements best describe the main differences between these two mechanism?

a) physical mechanism takes the form of secreted proteins from surrounding cells that influence stem cell & progenitor differentiation through endocrine

b) Chemical mechanisms including Structural & adhesion factors within the extracellular matrix 

c) physical mechanisms including Structural & adhesion factors within the extracellular matrix 

d) chemical regulation of stem cells takes the form of secreted proteins from surrounding cells that influence stem cell & progenitor differentiation through endocrine

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#Question id: 2831

#Unit 2. Cellular Organization

Specific DNA control elements in promoters can

a. interact with general transcription factors.

b. interact with repressor proteins.                 

c. interact with activator proteins.

d. remain unavailable because of condensed chromatin. 

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#Question id: 838

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following correct predict the transition state?

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#Question id: 13228

#Unit 6. System Physiology – Plant

Classification of plant mineral nutrients according to biochemical function

Mineral nutrient	Functions
A.)  Silicon(Si)	1.)    Constituent of alcohol dehydrogenase, glutamic dehydrogenase, carbonic anhydrase, etc
B.)  Manganese(Mn)	2.)    Component of sugar phosphates, nucleic acids, nucleotides, coenzymes, phospholipids, phytic acid, etc. Has a key role in reactions that involve ATP
C.)  Zinc(Zn)	3.)    Contributes to cell wall mechanical properties, including rigidity and elasticity.
D.)  Phosphorous(P)	4.)    Component of ascorbic acid oxidase, tyrosinase, monoamine oxidase, uricase, cytochrome oxidase, phenolase, laccase, and plastocyanin.
E.)   Copper(Cu)	5.)    Required for activity of some dehydrogenases, decarboxylases, kinases, oxidases, and peroxidases. Involved with other cation-activated enzymes and photosynthetic O2 evolution

Which of the following combination is correct?

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#Question id: 9593

#Unit 6. System Physiology – Plant

The lower-energy orbital of the positively charged oxidized reaction centre chlorophyll has a vacancy and can accept an electron If the acceptor molecule donates its electron back to the reaction centre chlorophyll, What will happened?

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#Question id: 18986

#Unit 13. Methods in Biology

there are certain limitations of Recombinant Protein Production in E. coli, which are