You turn on a light and observe cockroaches scurrying to dark hiding places. What have you observed?

TLS Online TPP Program

#Question id: 451

#Unit 1. Molecules and their Interaction Relevant to Biology

The standard reduction potentials (E'°) for the following half reactions are given.

Fumarate + 2H+ + 2e– -> succinate E'° = +0.031 V

FAD + 2H+ + 2e– -> FADH2 E'° = –0.219 V

If you mixed succinate, fumarate, FAD, and FADH2 together, all at l M concentrations and in the presence of succinate dehydrogenase, which of the following would happen initially?

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#Question id: 19098

#Unit 6. System Physiology – Plant

Quorum sensing in E. carotovora is mediated by

TLS Online TPP Program

#Question id: 11538

#Unit 7. System Physiology – Animal

Prostaglandins are local regulators whose chemical structure is derived from ________.

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#Question id: 2856

#Unit 2. Cellular Organization

Match the lac genes with their enzymes & functions;

lac genes	Enzyme	Functions
lacZ	b-galactosidase	which rids the cell of toxic thiogalactosides that also get transported in by lacY.
lacY	thiogalactoside transacetylase	which cleaves the sugar lactose into galactose and glucose, both of which are used by the cell as energy sources
lacA	lactose permease	a protein that inserts into the cell membrane and transports lactose into the cell

TLS Online TPP Program

#Question id: 12391

#Unit 6. System Physiology – Plant

Which of the following processed are involve in cell enlargement in plant?

a) Osmotic uptake of water across the plasma membrane is driven by the gradient in water potential (∆Yw)

b) Turgor pressure builds up because of the rigidity of the cell wall

c) Biochemical wall loosening occurs, allowing the cell to expand in response to turgor pressure