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TLS Online TPP Program

#Question id: 549

Which one of the following statements is true of enzyme catalysts?

#SCPH05 I Biotechnology

  1. They bind to substrates, but are never covalently attached to substrate or product.

  2. They increase the equilibrium constant for a reaction, thus favoring product formation.

  3. They increase the stability of the product of a desired reaction by allowing ionizations, resonance, and isomerizations not normally available to substrates.

  4. They lower the activation energy for the conversion of substrate to product.

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TLS Online TPP Program

#Question id: 7299

#SCPH01 Biochemistry

Maintenance of the shoot meristems in adult Arabidopsis plants relies on which of the following mechanisms?
TLS Online TPP Program

#Question id: 10582

#SCPH06 I Botany

Which of the following is incorrect?
TLS Online TPP Program

#Question id: 15617

#SCPH28 | Zoology

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1–, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac–). During an condition you have a wild type (Lac+) strain carrying a Tn5 insertion known to be near several Lac genes on the E. coli chromosome. You grow P1 phage on this strain and use the resulting phage lysate to infect the lac1– strain, selecting for kanamycin resistance (Kanr). Among 100 Kanr transductants, you find that 82 are Lac– and 18 are Lac+. Express the distance between Tn5 and the lac1– mutation as a cotransduction frequency;
TLS Online TPP Program

#Question id: 11452

#I Life Science/ Life Sciences Group – I-V

A given photon of light may trigger an action potential with thousands of times more energy because the signal strength is amplified by ________.
TLS Online TPP Program

#Question id: 1651

#SCPH05 I Biotechnology

Ig idiotypes are found: