Drought affects human society by causing
a. widespread crop failure.
b. dried up wells.
c. livestock death.
d. human starvation.
e. all of these.
Answer: e
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Why does it take more than a week before a mosquito just infected with yellow fever virus can transmit the disease?
A. The virus must replicate in the gut of the mosquito before it can reach high enough numbers for transmission to a new human. B. Mosquitoes only feed once a week, which limits their ability to transmit the disease rapidly. C. Yellow fever is caused by a protozoan. It must develop from the sporozoite form into the mature form to become infectious, and this takes time. D. The virus multiplies in the gut of the mosquito, but then needs to migrate to the proboscis (biting nose) of the animal in order to infect a new human being after a new bite. This migration takes time
Mammals may ____ as a response to cold in order to limit the amount of heat lost to the surroundings
a. shiver b. go off to lay alone so that others do not take their heat c. press hair shafts close to the body d. reduce blood flow to the skin e. lose brown adipose tissue
Both starch and cellulose are made by stringing together many glucose molecules. However, while starch is easily digested by humans, cellulose is indigestible. The starch polysaccharide has bonds occurring below the sugar rings, while the bonds in cellulose alternate above the ring and below the next ring. How can you explain humans' inability to digest cellulose?
A. The alternating bonds make the cellulose molecule too large and bulky to enter cells for digestion. B. The acidic molecules found in stomach acid cannot act on the bonds that are above the sugar rings in cellulose. C. Humans do not eat cellulose. D. Cellular respiration is only capable of breaking down specific bonds. E. The enzyme that breaks down starch can only fit the specific bond configuration of bonds below the ring.
Which of the following statements is TRUE of selective toxicity?
A) Selective toxicity takes advantage of structural differences between host and pathogen. B) To be effective, an antimicrobial agent must be more toxic to the patient than the pathogen. C) Selective toxicity takes advantage of metabolic differences between host and pathogen. D) Antimicrobial agents must target structural differences between host and pathogen and be more toxic to the patient than the pathogen. E) Selective toxicity takes advantage of structural and/or metabolic differences between host and pathogen.