Practice Questions

TLS Online TPP Program

#Question id: 3868

The sigma factor of E. coli RNA polymerase:

#Unit 3. Fundamental Processes

associates with the promoter before binding core enzyme.
combines with the core enzyme to confer specific binding to a promoter.
is inseparable from the core enzyme.
is required for termination of an RNA chain.

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TLS Online TPP Program

#Question id: 17995

#Unit 8. Inheritance Biology

Consider a heritable autosomal disease with an incidence in the population of 1 per thousand. On average, individuals with the disease have 80% as many children as the population average. In answering the various parts of this question, assume that mating is random. What mutation rate would be required to maintain the observed incidence of the disease in the population if the disease is recessive?

TLS Online TPP Program

#Question id: 17996

#Unit 8. Inheritance Biology

Consider a heritable autosomal disease with an incidence in the population of 1 per thousand. On average, individuals with the disease have 80% as many children as the population average. In answering the various parts of this question, assume that mating is random. Now assume that the mutation rate is zero, that the disease is recessive, and that the disease allele is maintained in the population by heterozygote advantage. Calculate the heterozygote advantage,

TLS Online TPP Program

#Question id: 17997

#Unit 13. Methods in Biology

In RNA isolation, for protein free solution what will be the ratio at nm

TLS Online TPP Program

#Question id: 17998

#Unit 13. Methods in Biology

Eukaryotic mRNA species are isolated by using

TLS Online TPP Program

#Question id: 18001

#Unit 9. Diversity of Life Forms

Where in an angiosperm would you find a megasporangium?

TLS Online TPP Program

#Question id: 18002

#Unit 9. Diversity of Life Forms

What is the greatest threat to plant diversity?