In insects and spiders, __________ take up fluid, uric acid, and solutes from the blood and deliver
them to the gut. Fill in the blank(s) with the appropriate word(s).
Malpighian tubules
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When Lyme disease was first being investigated, the observation that frequently only one person in a household was infected was a clue leading to the discovery that the disease was spread by arthropod bites. Why was this so?
A. Mosquitoes (an example of arthropods) are never inside a house. They are strictly outdoor animals, so they couldn't spread the infection inside the household. B. Mosquitoes (an example of arthropods) only bite once in their life cycle. As such, they can only transmit the illness once before they die. Even if an infected mosquito was inside a house, it could therefore only infect one human. C. If the infection is spread by the bite of an arthropod, it wouldn't spread easily by respiratory secretions, direct contact, or sexual contact between individuals within the family. D. Arthropods lose their mechanical ability to bite a human after a single bite, much like certain bees that lose their stinger after a single sting. This prevents them from transmitting the infection to more than one individual in a household.
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates
Which of the following are found in the nucleus?
a. plastids b. vacuoles c. vesicles d. nucleoli e. microbodies
Genetically modified organisms that acquire genes from a different species are called ________ organisms
A) mutant B) synthetic C) cloned D) transgenic