1,698 Answered Questions for the topic biochemistry

Biochemistry

03/14/22

Calculate the concentration for a sample of Cyt C with an absorbance at 280nm of 6 , giving your answers in units of mg protein/ml
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Biochemistry

03/14/22

Isopropyl alcohol, sold as rubbing alcohol, is composed of C, H, and O. Combustion of 0.255 g of isopropyl alcohol produces 0.561 g of CO2 and 0.306 g of H2O. Determine the empirical

 Isopropyl alcohol, sold as rubbing alcohol, is composed of C, H, and O. Combustion of 0.255 g of isopropyl alcohol produces 0.561 g of CO2 and 0.306 g of H2O. Determine the empirical formula of... more
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03/11/22

Calculate the substrate concentration when the initial velocity is 1/8th of Vmax. The km for its substrate is 10 mM.
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03/11/22

Calculate the substrate concentration when this an enzyme has a Vmax of 1.2 𝜇M s−1. The Km for its substrate is 10 𝜇M.
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03/10/22

What are the answers from these letters below?
(a) 1 N hydrochloric acid = g hydrochloric acid(b) 1 M hydrochloric acid = g hydrochloric acid(c) 2 N phosphoric acid = g phosphoric acid(d) 2 M phosphoric acid = g... more
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03/10/22

How many grams of sulfuric acid are there are there in 4 mol sulfuric acid?
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Biochemistry

03/09/22

Question about buffers
I have a hard time understanding the concept of buffers. I see in books it says the rule of thumb is pka should be +/- 1 pH unit from the ph of the reaction. When would it be useful to prepare a... more
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03/09/22

How many grams of nitric acid are there in 3 mol nitric acid?
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03/09/22

Solve for the molarity of 0.327 grams sulfuric acid in a 250 ml solution.

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03/09/22

What is the normality of 0.446 g hydrochloric acid in a 250 ml solution?
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03/09/22

Solve for the normality of 0.545 grams sodium carbonate in a 500 ml solution.
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03/09/22

A silver chloride sample was allowed to dissociate in 15 ml of water.

What is the chloride ion concentration if the sample weighs 0.5479 g?
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Biochemistry Biology Molecules

03/09/22

What’s the name of a molecule with 8 hydrogens, 3 carbons, and 2 oxygens?
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03/09/22

Question about a cell
How can you look at a diagram (of plasmodium falciparum’s simplified cell structures) and prove that apicoplasts once evolved from free-living, prokaryotic organisms? the diagram showed the... more
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Biochemistry Biology Molecules Water

03/09/22

What 2 general steps follow the reception of a signalling molecule (ligand)?
I don’t know if this is useful, but the question said: nerve growth factor is a water-soluble signalling molecule.
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Biochemistry Biology Enzyme Amino Acids

03/09/22

How do I do this question?
Structural diagram: amino acid with R group: CH3a mutation in the gene coding for a single-polypeptide enzyme results in the substitution of the amino acid serine, which has a polar R group, by the... more
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03/09/22

BOILING POINT OF A SOLUTION
How many moles of ions are formed in aqueous solution when 1 mol of Sr(OH)2 dissolves in water? Explain its effect in the freezing and boiling point of a solution
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03/09/22

COLLIGATIVE PROPERTY CHEMISTRY
Which compound will have the lowest impact in the colligative property? Why?A. 3 mol CaCl2B. 3 mol C6H12O6C. 3 mol NaClD. Both A and B
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03/08/22

An excess lead nitrate solution was added to a 6.5 g sample mixture containing strontium nitrate and potassium bromide to precipitate out 0.8993 g of lead (II) bromide.

Solve for the percent by mass of the individual components of the mixture.
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03/08/22

An excess sodium sulfate was added to a 53-ml sample of barium nitrate.

If 3.09 g of ppt was formed, what is the molar concentration of the sample?
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Biochemistry Science Physics

03/07/22

Carter and his girlfriend both swim at 4.0 m/s. They jump into a river 1.0 Km across, with a current of 3.0 m/s [E]
a) Carter faces (heads) due north at all times. What is his velocity relative to the ground?b) Carter's girlfriend swims straight across relative to the shore ( she does this by heading upstream a... more
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Biochemistry Science Physics

03/07/22

A young pilot flies 300.0 km [E] adn then back home 300.0 km [w] at an air speed of 300.0 km/h. A 30.0 km/h wind is blowing to the east.
a) what is the pilot's velocity relative to the ground for each leg of the trip?b) What is the time for each leg of the trip, in minutes?c) how long, in minutes, would the trip take if there were... more
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Biochemistry Biology

03/03/22

DNA and mRNA -----
 DNA sequence: TAC CCC CCG AGA AGC CCT ATC  mRNA sequence:   DNA sequence: TAC TTA CCG AGA TTC TTG TTT ATC       mRNA sequence:    DNA sequence:TAC CCC CCG GAA TGA TGC ATC      mRNA sequence: 
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03/03/22

Indicate which member of the pair you would expect to have the higher boiling point.
HCl or I2 CH3F or CH3OH H2O or H2S SiO2 or SO2
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03/03/22

Choose the predominant intermolecular force involved for each substance.
Choices (London dispersion, Dipole-dipole, Hydrogen Bond, Covalent Network, Ionic Forces)Pair 1: HClPair 1: I2Pair 2: CH3FPair 2: CH3OHPair 3: H2OPair 3: H2SPair 4: SiO2Pair 4: SO2
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