1,708 Answered Questions for the topic biochemistry

11/22/18

What is the molecular structure of these and why?
XeCl​2​ , ICl​3​ , TeF​4​ , PCl​5what is the molecular structure of these and why?
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Biochemistry Chemistry

11/22/18

pH value from pka

Calculate the pH for a solution of 0.15 M CH​3C​ OOH, given that the p​K​a​ for the acid is 4.75.
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11/22/18

Enthalpy question

The heats of formation of CH​4(​ g), H​2O​ (g) and CO(g) are -890.4 kJ mol-​ 1​, -241.8 kJ mol-​ 1 and -110.5 kJ mol-​ 1​ respectively. Determine the enthalpy change for the reaction and state... more
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11/22/18

Equilibrium.... shift of equilibrium

Oxygen can be converted to ozone (O​3)​ in the following reaction:3 O​2(​ g) + heat ⇌ 2 O​3​(g)All of the following changes at equilibrium will shift the reaction to products except:A. adding O​2​... more
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Biochemistry Chemistry Enthalpy

11/22/18

Enthalpy change

In gluconeogenesis, glucose can be produced by reaction of pyruvic acid and glycerol. Upon consideration of the simplified version of this reaction, as shown below, and making use of the data in... more
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Biochemistry Chemistry

11/16/18

please turn the verbal sentence(s) into an expression.
The sum of two numbers is 6. The second number is three times greater than the first number.
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08/27/18

How to make a buffer?
So I have to make a 0.02 M Sodium Phosphate buffer @ pH of 7, easy enough I use monosodium and disodium phosphate as the acid and base, I used the henderson hasselbach equation. But now I have to... more
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08/27/18

What is the Main Energy Processing System in PLANTS?
Basically a Bioenergetic Question. Choose one of the Ans. That you think is the right one. A. PHOTOSYNTHESIS B. RESPIRATION C. MITOCHONDRIA D. BOTH A&B   THANKS FOR THE HELP!
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06/17/18

Quantum Numbers and Ground vs Excited State
If an excited H atom EMITS a 95nm photon when relaxing to the ground state, what was the principle quantum number of the excited state?    a. 1 b. 2 c. 3 d. 4 e. 5
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04/13/18

How could SDS Page and immunoblot be used to determine whether a viral protein was a glycoportein?
How could SDS Page and immunoblot be used to determine whether a viral protein was a glycoportein? Can u please explain how it works?
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04/11/18

how can IHC be used to judge the virulence of 2 neuro-invasive virus strains in mouse infections?
can u also reference a good website or paper that explains it?  
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Biochemistry Trna

03/31/18

The process of translation uses fewer tRNA's than codons
A. when nutrient levels are low, in order to conserve energy B. because certain tRNAs can recognize multiple codons C. due to several amino acids sharing certain tRNA's D. so splicing is... more
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Biochemistry Rna Splicing

03/31/18

In eukaryotes, which of the following is true of RNA splicing?
Here are the options:   A. It increases the variety of proteins that are made   B. It eliminates exons before introns are translated   C. It prevents accidental translation of ssDNA   D. It... more
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Biochemistry Dna

03/31/18

Which of the following best describes the organization of eukaryotic DNA?
Here are the options:   A. Each chromosome is circular when fully relaxed   B. Its genes are grouped in operons according to function   C. Many exons exist within its gene that must be... more
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03/24/18

What clinical problems would be expected to arise if fetal hemoglobin persisted into adulthood?
 Fetal hemoglobin has higher oxygen affinity so my only thought might be that it would not release oxygen as easily in the tissues.
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Biochemistry Biology Stability Muscle

03/17/18

What causes tropomyosin's affinity for actin?
I'm doing research via expansion microscopy on tropomyosin stability and how it effects actin myosin binding and muscle contraction. I'm super new to research so I don't think my professor expects... more
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Biochemistry Biology Tutor Lab Report

02/24/18

SDS-Page question?
what is the relationship between gel strength (%) and mobility of protein?
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02/12/18

how does reasoning aid biochemistry research?
How do a biochemist analyse a problem and profer solutions? What methods are taken? 
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12/03/17

I need to calculate the molar extinction coefficient for phycocyanin.
I have a calibration curve, with the equation of the line, and the concentrations of the plotted points, with absorbency plotted against concentration (mg/ml) How do I solve using the Beer Lambert... more
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11/21/17

How to work out Vmax / Km
from a lineweaver burk plot, I have calculated slopes of 12.42 and 1.38.   The y intercept is 1.493 and 1.031 w/ respect to the slopes.   Please include working out if possible thanks 
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11/21/17

lineweaver burt plot
which of the thtee methods of analysis do you think gives the least accurate estimate? Give reasons for your answer [10marks]    1) v against [S] plot 2) lineweaver burk plot 3) computer analysis  more
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Biochemistry Chemistry Maths

11/13/17

CALCULATE THE CONCENTRATION OF A SAMPLE OF BOVINE SERUM ALBUMIN
Calculate the concentration of a sample of bovine serum albumin (Mr 67,000) with an absorbance at 280 nm of 0.5, giving your answer in units of M (Molarity) (NOTE: ε at 280 nm = 1 cm3 mg-1 cm-1 and... more
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Biochemistry Chemistry Maths

11/13/17

CALCULATE PROTEIN CONCENTRATION
Calculate the protein concentration for a sample with an absorbance at 280 nm of 0.5, giving your answer in units of mg protein/ml (NOTE: ε at 280 nm = 1 cm3 mg-1 cm-1 and a cuvette of 1cm path... more
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Biochemistry

10/08/17

I need help with zwitterion form.
example would be Lysine.   I know the standard form just having trouble grasping the concept.   Thank you!
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Biochemistry

09/26/17

Regarding enzyme kinetics
You are deciding which of two enzymes to buy for your Biotech company. Evaluated on the same substrate Enzyme A has a kcat of 950 s-1 and a KM of 200 μM, whereas Enzyme B has a kcat of 2500 s-1 and... more
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