Bio Chemistry Interview Questions
Questions Answers Views Company eMail

What is a plasmalogen? What do plasmalogens do?

1 5449

What is the role of PAPS?

1 2162

what is Alzheimer's disease?what are its symptoms?

1 3203




Compare and contrast feedback inhibition and enzyme repression?

8012

The peptide bond in proteins is a) nonpolar, and fixed in a trans conformation. b) nonpolar, but rotates to three preferred dihedral angles. c) planar, and usually found in a trans conformation. d) planar, but rotates to three preferred dihedral angles.

1 1728

If the enthalpy change for a reaction is zero, DG? is equal to: a) DH? b) lnKeq c) TDS? d) -TDS?

1 1929

The nucleophile in the first stage of the serine protease mechanism is a) H2O b) the carboxyl of Asp 102 c) the hydroxyl of Ser 195 d) the imidazole of His 57

922

The elution volume of an enzyme on a gel filtration column can be predicted from a) its enzyme activity b) its protein absorbance at 280 nm c) subunit composition and monomer molecular mass(es) d) Choices a) and b) are both correct.

1886




DNA binding by proteins with the helix-turn-helix (HTH) motif does not involve a) altered stacking of the DNA at the center of symmetry. b) hydrogen bonds, salt bridges, and van der Waals contacts. c) interactions with base pairs in the major groove of DNA. d) interactions with the sugar-phosphate backbone of DNA.

877

The two exonuclease activities of DNA polymerase I a) are coupled during the formation of "gapped DNA". b) degrade DNA in a 5' --> 3' direction. c) degrade DNA in a 3' --> 5' direction. d) occur at two different active sites.

1 1513

A principal difference between prokaryotic and eukaryotic DNA replication is a) completely different proteins/enzymes in eukaryotes b) multiple origins in eukaryotes c) no requirement for topoisomerase activity in prokaryotes d) the absence of a nucleus in prokaryotes

9 30113

When s subunit dissociates from an initiated RNA polymerase, a) it can bind a core enzyme to reform holoenzyme. b) it hydrolyzes ATP until rebound by core enzyme. c) it leaves behind an elongating species complexed with Rho factor. d) it remains bound to the promoter consensus sequence.

1 1816

The junction between the two helical portions of tRNA is stabilized by many non-standard base-base interactions between residues in the a) anticodon and CCA ends. b) helical stems of the D and Anticodon stems. c) loops of the Anticodon and Acceptor stem. d) loops of the TYC and D arms.

1 1479

On the ribosome, mRNA binds ____; the peptidyl transferase reaction occurs ____. a) to the large subunit; on the small subunit. b) to the small subunit; on the large subunit. c) between the subunits; on the large subunit. d) between the subunits; on the small subunit.

2 2777

According to the fluid mosaic model of cell membranes, which type of molecule spans the membrane from its inner to outer surface? a) cholesterol b) phospholipid c) protein d) triacylglycerol

PH.D Interview,

1 2779


Post New Bio Chemistry Questions






Un-Answered Questions { Bio Chemistry }

How are free energy changes related to enthalpy changes and entropy changes?

819


why we use 96 well plate in ELISA plate reader?

1092


why we use 96 well plate in ELISA plate reader?

1083


When it functions as a "second messenger", cAMP a) acts outside the cell to influence cellular processes. b) acts "second in importance" to AMP. c) activates all cytosolic protein kinases. d) activates the cAMP-dependent protein kinase.

872


What are the structures of the products of this reaction, and how are they identified?

876






What factors can change the pKa value of an amino acid residue, and in which direction?

1286


Why does physical exertion increase symptoms of poisoning by trematol?

1487


Hi, I am venkat. I am done with M.Sc Medical Biochemistry in the year 2007. I got rejected 3 times at US consulate, and the reason they say is why are you going agian for PG when you have already done PG, and they are not ready to get convinced only on this issue.

928


bane the by products when crude oil is refined by distillation

940


How does a random coil differ from an irregularly structured region?

951


What is the structural formula of molybdenum blue?

2209


Which vitamins participate, in coenzyme form, in reactions of the tricarboxylic acid cycle?

889


why ph is not more than 14?

213


what is meant by codan optimisation m rna enrichment?

1297


what are the steps involved in the calibration of HPLC

1412