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TLS Online TPP Program

#Question id: 2906

A closer look at the interactions between the histones and the nucleosomal DNA reveals the structural basis for the binding and bending of the DNA within the nucleosome. Fourteen distinct sites of contact are observed, one for each time the minor groove of the DNA faces the histone octamer. State whether the following set of statements is true/false regarding this association?

I. The majority of these associations are between the proteins and the oxygen atoms in the phosphodiester backbone near the minor groove of the DNA.

II. The association of DNA with the nucleosome is mediated by a large number (about 40) of hydrogen bonds between the histones and the DNA.

III. Maximum numbers of hydrogen bonds are made between the protein side chains and the bases, and all of these are made in the minor groove of the DNA.

IV. The highly basic nature of the histones further facilitates DNA bending by masking the negative charge of the phosphates that ordinarily resists DNA bending.

V. The positively charged nature of the histones facilitates the close juxtaposition of the two adjacent DNA helices necessary to wrap the DNA more than once around the histone octamer.

#Unit 2. Cellular Organization

  1. T – T – F – T – T 

  2. F – T – F – T – T 

  3. T – T – F – T – F 

  4. T – F – T – T – T 

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TLS Online TPP Program

#Question id: 12702

#Unit 8. Inheritance Biology

Some given characteristics features of Cytoplasmic inheritance, which of the following statements are not follow the inheritance pattern;
a) Cytoplasmic gene and their trait present in both male and female
b) Reciprocal cross results aren’t change
c) Exhibit extensive phenotypic variation
d) Reciprocal cross results are change
e) Mendel’s principle of segregation and independent assortment are follow
TLS Online TPP Program

#Question id: 12703

#Unit 8. Inheritance Biology

In the plants, due to mutation in the mitochondrial genome causing cytoplasmic male sterility can be influenced by the nuclear gene (Rf),  which is dominant over the cytoplasmic mitochondrial genome. If a male sterile plant  is pollinated by the fertile male plant with homozygous (Rf)condition, the progeny obtained in F1 will have
TLS Online TPP Program

#Question id: 12704

#Unit 8. Inheritance Biology

Cytoplasmic male sterility (CMS) in plants is caused by mutation in the mitochondrial genome. CMS can be restored by a nuclear gene, restorer of fertility (Rf), which is a dominant character. 
TLS Online TPP Program

#Question id: 12705

#Unit 8. Inheritance Biology

In Neurospora crasssa, the mutant exhibit poky phenotype, when a female of  poky strain is crossed with a normal strain acting as a male , all progeny individuals shows poky phenotype . however, the reciprocal cross resulted in all normal progeny. These results can be explained on the basis of 
TLS Online TPP Program

#Question id: 12706

#Unit 8. Inheritance Biology

When the genotype is determined by the bi-parental contribution, while the phenotypic effect is determined by the maternal nuclear gene. This effect exhibit on the basis of 
TLS Online TPP Program

#Question id: 15006

#Unit 8. Inheritance Biology

Which of the following is not a mechanism for sex determination?