The concentration of the pesticide DDT is likely highest in which organism?

A. a seagull
B. plankton
C. a minnow
D. a mosquito larva


Answer: A. a seagull

Biology & Microbiology

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Desensitization of a cell to a ligand may involve all of the following except

A) destruction of the ligand. B) a lessened response to the ligand. C) receptor down-regulation. D) receptor-mediated endocytosis. E) lowered affinity of a receptor for the ligand.

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The concepts of transcription and translation have been said to form the ‘central dogma’ of molecular biology. Is this a

fitting description? What will be an ideal response?

Biology & Microbiology

The _____________ functions to package molecules into vesicles that can be transported out of a cell.

A) ribosome B) lysosome C) Golgi apparatus D) endoplasmic reticulum

Biology & Microbiology

Which of the following would be considered an environmental mutagen?

A) free radicals B) spontaneous events C) ultraviolet light D) the collision of water molecules with DNA E) DNA replication errors

Biology & Microbiology