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TLS Online TPP Program

#Question id: 2022

Which one of the following is not true for class 1 MHC protein?

#Unit 4. Cell Communication and Cell Signaling

  1. Class-I MHC gene encodes glycoprotein molecule which expressed on the surface of all nucleated cells and platelets. 

  2. MHC-I molecule contains a 45KDa α-chain associated non-covalentely with a 12KDa β2 microglobulin molecule. 

  3. Association of α-chain and β2 microglobulin is required for expression of class-I MHC molecule on cell membrane.

  4. Major function of MHC-I is to bind peptide antigen and present to CD4 T cells.

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TLS Online TPP Program

#Question id: 29112

#Unit 8. Inheritance Biology

An example of multiple alleles is at a locus that determines the feather pattern of mallard ducks. One allele, M, produces the wild-type mallard pattern, MR, produces restricted, and a third allele, md, produces dusky. In this allelic series, dominancy shows MR >M > md
If a cross between  MR md X M md, What proportion of progeny will be restricted?
TLS Online TPP Program

#Question id: 14962

#Unit 8. Inheritance Biology

In single factor crosses between two true breeding strains of tree frog, a scientist discovers that plain green tree frogs and tree frogs with a red 'racing stripe' always produce offspring that have red racing stripes. Why?
TLS Online TPP Program

#Question id: 5158

#General Aptitude

Find the unit digit in 1! + 2! + 3! + 4! +.................... + 50!
TLS Online TPP Program

#Question id: 4796

#Unit 8. Inheritance Biology

Trait is encoded by  genes that are expressed in only one sex . In domestic chickens, display a feather pattern in male and female

Genotype                        Male phenotype           Female phenotype

HH                             hen feathering                      hen feathering

Hh                         hen feathering                            hen feathering

hh             cock feathering (plumage pattern )         hen feathering

If cross between Hh and Hh. what is probability of their progeny with cock feathering
TLS Online TPP Program

#Question id: 4143

#Unit 3. Fundamental Processes

It is possible to convert the Cys that is a part of Cys-tRNACys to Ala by a catalytic reduction.  If the resulting Ala-tRNACys were added to a mixture of (1) ribosomes, (2) all the other tRNAs and amino acids, (3) all of the cofactors and enzymes needed to make protein in vitro, and (4) mRNA for hemoglobin, where in the newly synthesized hemoglobin would the Ala from Ala-tRNACys be incorporated?