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TLS Online TPP Program

#Question id: 1056

During penetration of E. coli by the T4 phage

#XL - T Zoology

  1. lysozyme is used to allow entry of the phage capsid.

  2. the tail acts as a "hypodermic needle," injecting the phage DNA into the cell.

  3. the protein fibers digest a hole in the cell wall.

  4. the bacterial receptor molecules open a hole through the cell wall.

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TLS Online TPP Program

#Question id: 4613

#XL - T Zoology

The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change.  Which species is most closely related to species W?
TLS Online TPP Program

#Question id: 4564

#XL - S Microbiology

Who would have proposed that the boundaries between each stratum mark the occurrence of different localized floods?
TLS Online TPP Program

#Question id: 15337

#XL - S Microbiology

HSCs express which type of cell-surface molecule, which is the receptor for stem cell factor (SCF). It is a cytokine that exists in both membrane-bound and soluble forms and the SCF-surface molecules interaction is critical for the development, in adult animals, of multipotential progenitor cells (MPPs).  Which type of surface molecules HSCs express?
TLS Online TPP Program

#Question id: 148

#XL - T Zoology

The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.
TLS Online TPP Program

#Question id: 10557

#XL - R Botany

The attraction of water to a solid phase such as a cell wall or glass surface known as