First invertebrates insects fossil appeared in which of the following geological ages?

a) Mesozoic b) Jurassic

c) Paleozoic d) Devonian

e) Permian f) Pennsylvanian

Which of the following combinations give the best answer?

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#Question id: 1545

#SCPH05 I Biotechnology

B cells negatively regulated by,

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#Question id: 7701

#SCPH05 I Biotechnology

The various taxonomic levels (for example, phyla, genera, classes) of the hierarchical classification system differ from each other on the basis of ________

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#Question id: 15638

#SCPH01 Biochemistry

You have isolated two mutations that show decreased expression of the Lac operon. However, unlike like the promoter mutations, these mutations don’t respond to the inducer IPTG. These mutations, designated Lac3– and Lac4–, are evaluated for the quantity of ß-galactosidase and permease activity expressed with or without IPTG:

 

Mapping experiments reveal that Lac3– and Lac4– are different short deletions located in the region before the start of the LacZ gene. Given the data shown above suggest which genetic element(s) in addition to part of the promoter has been deleted in each mutant. 

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#Question id: 1580

#SCPH05 I Biotechnology

Advantages of Toxoid (inactivated exotoxin) can be

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#Question id: 14158

#SCPH01 Biochemistry

BLAST uses a _______ to find matching words, whereas FASTA identifies identical matching words using the _____