Dibenzoylhydrazines are a category of molecules that have been used as insecticides. They work by blocking ecdysteroid receptors. How does this kill an insect?
A. The insect can no longer excrete nitrogenous wastes.
B. The insect cannot molt.
C. The chitinous exoskeleton is dissolved.
D. The insect can no longer coordinate its movements.
Answer: B
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Peaks of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) production occur during _____
A) the menstrual flow phase of the uterine cycle B) the beginning of the follicular phase of the ovarian cycle C) the period just before ovulation D) the end of the luteal phase of the ovarian cycle E) the secretory phase of the menstrual cycle
Hominines include
A. humans, chimpanzees, and gorillas. B. humans, gorillas, and orangutans. C. orangutans, chimpanzees, and gorillas. D. humans, gibbons, and orangutans. E. gorillas, gibbons, and orangutans.
Which of the following diseases is caused by a spirochete?
a. syphilus b. chlamydia c. strep throat d. botulism
Based on these LD50 values, which microbe is the most virulent? Assume each bacterium enters through the appropriate portal of entry.
A) E. coli O157-1000 cells B) Cryptosporidium-50 cells C) Shigella-10 cells D) Vibrio cholerae-108 cells