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23 Nov 2019

According to Daltons atomic theory the smallest particle which can exist independently is

A An atom

B A cation

C A molecule

D An anion

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Related questions

)(8 pts) Use the following information: Protein Molecular Weight pI (a) Pyruvate Phosphate Dikinase 110,000 Daltons 8.25 (b) Sortase A 24,810 Daltons 6.20 (c) Heparin Lyase 43,150 Daltons 8.90 (d) Phosphopentose Mutase 65,000 Daltons 4.85 (e) Homoserine Dehydrogenase 229,000 Daltons 5.50 a.) If the preceeding proteins were separated by gel filtration, what would be the order of elution? First off-______________________________________-last to elute b.) If the preceeding proteins were separated by isoelectric focusing then what would be the order of migration (Cathode (-) (+) anode)? Cathode-_____________________-Anode c.) If the preceeding proteins were separated by anion exchange chromatography at pH 7, what would be the order of elution? First off-_____________________________- last to elute d.) If the preceeding proteins were separated by SDS-PAGE, what would be the order of migration from the top to the bottom of the gel? Top-___________________________-bottom

When considering anion exchange chromatography, which of the following statements best describes how increasing concentrations of NaCl elute the protein from the column?

Option A: The proteins that are bound to the chromatography resin are exchanged for Cl–.

Option B: The Na+ ions that are bound to the chromatography resin are exchanged for proteins.

Option C: The proteins that are bound to the chromatography resin are exchanged for Na+.

Option D: The Cl– ions that are bound to the chromatography resin are exchanged for proteins.

Given your answer to the question above, which of the following methods would be best suited for a one-step purification of lactate dehydrogenase from a hypothetical mixture of the three proteins?

Option A: anion exchange chromatography using a pH 9 buffer

Option B: anion exchange chromatography using a pH 5 buffer

Option C: anion exchange chromatography using a pH 10.5 buffer

Option D: anion exchange chromatography using a pH 7 buffer

Which of the following combinations of methods would be best suited for the purification of cytochrome c from a hypothetical mixture of the three proteins?

Option A: Gel filtration chromatography to obtain the low molecular weight proteins, followed by cation exchange chromatography at pH 8.

Option B: Cation exchange chromatography at pH 10, followed by elution at high [NaCl], and final purification using gel filtration chromatography.

Option C: Anion exchange chromatography at pH 10, followed by elution at high [NaCl], and final purification using gel filtration chromatography.

Option D: Cation exchange chromatography at pH 7, followed by elution at high [NaCl], and final purification using gel filtration chromatography.

How many amino acids are in the longest form of the human DNA methyltransferase?

Option A: 1511

Option B: 1882

Option C: 1606

Option D 1678

Which of the following is true?

A. Atomic weight is determined by the number of electrons in an atom of a given element.
B. Atomic weight is determined by the number of protons in an atom of a given element.
C. The reactivity of an atom is based on the number of electrons in its outer valance.
D. The chemical reactivity of an atom is based on the overall number of electrons in the atom.

Thanks.

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