An effector is _____
something that causes an effect
a muscle or gland
what a motor neuron stimulates
all of the above
D. all of the above
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Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the appearance of a bacterial colony on a petri plate indicate?
A) The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B) The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C) A colony formed when a bacterial cell was not resistant to bacteriophage infection. D) The bacterial cells that made up a colony were resistant to antibiotic.
Aspirin and other nonsteroidal anti-inflammatory drugs (NSAID) inhibit inflammation by inhibiting an enzyme in the prostaglandin pathway. However, inhibiting this enzyme also inhibits other pathways that protect the stomach from damage by stomach acid
and that form blood clots. What can you conclude from this? A) The enzyme inhibition is nonreversible. B) The enzyme is found in many different types of cells. C) Prostaglandins cause blood clotting. D) Aspirin should not be given to people who people who need to synthesize enzymes.
Who developed a theory of evolution almost identical to Darwin's?
A) Lyell B) Wallace C) Aristotle D) Malthus
Chromosomes that are NOT involved in determining gender are known as
a. autosomes. b. sex chromosomes. c. homologues. d. linked.