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TLS Online TPP Program

#Question id: 8922

Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships?

#SCPH06 I Botany
  1. increased incidence of worm burrows in the fossil record
  2. increased incidence of hard parts in the fossil record
  3. increased incidence of organic material in the fossil record
  4. increased incidence of fern galls in the fossil record
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TLS Online TPP Program

#Question id: 3679

#SCPH01 Biochemistry

A mutation in an E. coli cell becomes active half-way through a round of replication. The cell completes the round of replication normally but then cannot start a second round. Which protein could be mutated?
TLS Online TPP Program

#Question id: 2065

#SCPH01 Biochemistry

Which of the following are least likely to diffuse through the phospholipid bilayer of a cell membrane?
TLS Online TPP Program

#Question id: 13038

#SCPH06 I Botany

Please arrange the following steps about ELIZA (Enzyme-linked immunosorbent assay) in chronological order
i. incubate with antibody-enzyme complex that binds primary antibody
ii. coat surface with antigen, block unoccupied sites with nonspecific protein
iii. add substrate, formation of colored product indicates presence of specific antigen
iv. incubate with primary antibody against specific antigen
TLS Online TPP Program

#Question id: 18652

#SCPH01 Biochemistry

The polymerization of the gel used in PAGE occurs between polyacrylamide and
TLS Online TPP Program

#Question id: 12902

#SCPH01 Biochemistry

An extension of microarray technology may also be used to analyze tissue sections,this process is known as_____