Which of the following events occur when E. coli is starved for tryptophan?

I.  The ribosome translates leader peptide completely

II. Transcription reads through attenuator into trp EDCBA

III. Tryptophanyl tRNA is not formed

IV. A stem loop structure involving regions 3 and 4 is formed at attenuator site

TLS Online TPP Program

#Question id: 28267

#Unit 5. Developmental Biology

Resact binds to receptor on sperm, it activates guanylyl cyclase which causes the sperm cell to produce_______

TLS Online TPP Program

#Question id: 24495

#Unit 3. Fundamental Processes

Which of the following step of splicing involves ATP

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#Question id: 3825

#Unit 3. Fundamental Processes

Telomeres are the repetitive sequence of T's and G's that are present in the eukaryotes to protect the random cleavage from nucleases. These telomeres are synthesized by the enzyme telomerase. Which of the following are the properties of enzyme telomerase?

TLS Online TPP Program

#Question id: 10323

#Unit 9. Diversity of Life Forms

If this figure is an accurate depiction of relatedness, then which taxon is unacceptable, based on cladistics?

TLS Online TPP Program

#Question id: 13014

#Unit 10. Ecological Principles

A population is correctly defined as having which of the following characteristics?

I. Inhabiting the same general area

II.    Individuals belonging to the same species

III.  Possessing a constant and uniform density and dispersion