The biceps brachii is responsible for flexing the forearm while the triceps brachii extends the forearm. Muscles with such opposite actions are called
(a) cooperative.
(b) antagonistic.
(c) involuntary.
(d) sensory.
(d) sensory.
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In an inflammatory response, the direct effect of histamine is to _______________
A. dilate blood vessels causing increased blood flow to the area of infection B. decrease heat accumulation in the area of infection C. directly kill bacteria D. attack cytotoxic T cells E. cause B cells to release antibodies
Provide at least two types of evidence that support the endosymbiont theory. What will be an ideal response?
Male spider inseminates a female spider by
a. Normal abdomen to abdomen mating b. External fertilization where a male spider dances a female over a spermatophore packet c. Injecting sperm with his pedipalps and then rapidly retreating before being eaten d. Transferring sperm via silk e. Avoiding the dangerous female spider altogether and fertilizing the eggs after they are laid in an egg case
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.