EGTA [ethylene glycol-bis(b-aminoethyl ether)- N,N,N′,N′-tetraacetic acid], a compound that can chelate (form a complex with) Ca2+, prevents Ca2+ uptake by cells and inhibits root gravitropism.

TLS Online TPP Program

#Id: 3861

#Unit 5. Developmental Biology

When the ratio of PSF relative to that of bacteria exceeds a certain threshold, cells stop proliferating and initiate the expression of genes that are required for their aggregation.

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#Id: 5988

#Unit 10. Ecological Principles

Ecosystem exploitation hypothesis

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#Id: 701

#Unit 3. Fundamental Processes

Which of the polymerase can recognise A-A complimentary base pairs as normal

1. I 2. II 3. III     4. IV 

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#Id: 3600

#Unit 3. Fundamental Processes

All the amino acids except methionine and tryptophan have more than one codon.

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#Id: 2727

#Unit 12. Applied Biology

Selectable reporter genes

Selectable marker genes include those conferring resistance to methotrexate (dhfr, isolated from Tn7 or plasmid R67); the antibiotics kanamycin (nptII, encoding neomycin phosphotransfcrase) and hygromycin (hptIV, encoding hygromycin phosphotransferase, .isolated from E. coli);