A group is experimenting with selection in an insect species due to exposure to a newly developed insecticide, cpd AW143. The group has found that after 10 generations of exposure, the population is now bimodal in its response to the drug
Close to 30% of the population are completely normal while 70% live only about 1/6 of the normal lifetime. This is an example of __________. A) threshold effect
B) stabilizing selection
C) additive genes
D) directional selection
E) disruptive selection
E
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What neurotransmitter is released at neuromuscular junctions in vertebrates?
A. acetylcholine B. serotonin C. epinephrine D. GABA E. endorphins
Which of the following is not a camouflage device?
a. chromatophores b. iridophores c. thigmotaxis d. obliterative countershading
The contraction phase of the cardiac cycle is known as ____
a. systole b. diastole c. cardiac output d. mean arterial pressure e. pulse pressure
George Flint is visiting the urologist today for complaints of urinary discomfort and generally not feeling well for quite some time. The doctor has ordered a test on Mr. Flint’s urine and has requested a sterile specimen. The assistant will introduce a flexible hollow tube through Mr. Flint’s urethra into the bladder to remove a sample of urine. This procedure is called .