In a disc diffusion assay, the zone of inhibition will be ________ for organisms more resistant to an antimicrobial agent
a. absent
b. smaller
c. larger
d. yellow
Answer: B
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Which of the following is not a way we can intentionally modify the genetic makeup of a cultivated species to protect it from herbivores?
A. crop breeding by manually making artificial crosses for desirable traits B. using bacteria to genetically introduce new genes to the plant C. importing new seed stock from other areas and crossing it with existing plants D. using viruses to insert novel defense genes into the plant E. spraying with chemical pesticides
The glottis is ____ when swallowing and ____ when speaking.
A. closed; open B. open; closed C. rigid; relaxed D. relaxed; rigid E. vibrating; closed
The neuron that secretes neurotransmitters into the synapse is called the _________, and the neuron that receives the signal is called the ________.
A. presynaptic neuron; postsynaptic neuron B. preneurotransmitter; postneurotransmitter C. postneurotransmitter; preneurotransmitter D. postsynaptic neuron; presynaptic neuron
Tumor suppressor genes _____.?
a) encode proteins that help prevent uncontrolled cell growth b) are cancer-causing genes introduced into cells by viruses c) are frequently overexpressed in cancerous cells d) often encode proteins that stimulate the cell cycle