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

Biology & Microbiology

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What neurotransmitter is released at neuromuscular junctions in vertebrates?

A. acetylcholine B. serotonin C. epinephrine D. GABA E. endorphins

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Which of the following is not a camouflage device?

a. chromatophores b. iridophores c. thigmotaxis d. obliterative countershading

Biology & Microbiology

The contraction phase of the cardiac cycle is known as ____

a. systole b. diastole c. cardiac output d. mean arterial pressure e. pulse pressure

Biology & Microbiology

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 .

Biology & Microbiology