TLS Online TPP Program

#Question id: 4952


Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?

#XL - S Microbiology
  1. How can amino acids, simple sugars, and nucleotides be synthesized abiotically?

  2. How can RNA molecules catalyze reactions?

  3. How did RNA sequences come to carry the code for amino acid sequences?

  4. How could polymers involving lipids and/or proteins form membranes in aqueous environments?

More Questions
TLS Online TPP Program

#Question id: 5429

#XL - T Zoology

Assume that three loci, each with two alleles (A and a, B and b, C and c), determine the differences in height between two homozygous strains of a plant. These genes are additive and equal in their effects on plant height. One strain (aabbcc) is 10 cm in height. The other strain (AABBCC) is 22 cm in height. The two strains are crossed, and the resulting F1 are interbred to produce 1000 F2 progeny. what is number of F2 progeny having intermediate height?

TLS Online TPP Program

#Question id: 5430

#XL - T Zoology

A plant height in Maize is control by 3 pair of polygene .Two varieties of maize averaging 120 and 60 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 40 inches in height. What is proportional of F2 progeny that is display phenotype either 120 cm or 60 cm height?

TLS Online TPP Program

#Question id: 5431

#XL - T Zoology

Plant having height 6 cm are allowed to cross with plant having height 2 cm , all F1 progeny having height uniform 4 cm were allowed selfing to produced F2 progeny in which 3 plant out of  8 having height  4 cm . what are number of polygene involve in that trait ?

TLS Online TPP Program

#Question id: 5432

#XL - T Zoology

which of the following are not feature of polygenic inheritance ?

TLS Online TPP Program

#Question id: 5522

#XL - T Zoology

In reptiles, birds, and mammals, mesoderm is made by invagination and involution into the

TLS Online TPP Program

#Question id: 5523

#XL - T Zoology

Ectodermal cells condense into placodes that change into