A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH:

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#Question id: 30

#Unit 1. Molecules and their Interaction Relevant to Biology

Amongst the following chemical elements that are essential to organisms, which of the following set of elements have an atomic number above that of selenium?

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#Question id: 5300

#Unit 11. Evolution and Behavior

What is metagenomics?

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#Question id: 4360

#Unit 3. Fundamental Processes

Which of the following functions are characteristic of general transcription factors in eukaryotes?

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#Question id: 2277

#Unit 2. Cellular Organization

A gram-positive bacterium is stained _______________ by the gram stain

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#Question id: 19840

#Unit 13. Methods in Biology

Match the following source of thermostable DNA polymerase with proofreading (3’−5’ exonuclease) activity;

DNA Polymerase	Sources
A- Tma	i) Pyrococcus furiosus
B- Deep VentTM	ii) Pyrococcus woesi
C- Tli	iii)  Thermotoga maritima
D- Pfu	iv) Pyrococcus sp.
E- Pwo	v) Thermococcus litoralis