Löffler syndrome is associated with which roundworm infection?
a. S. stercoralis
b. Ancylostoma duodenale
c. Trichostrongylus spp.
d. A. lumbricoides
D
Many A. lumbricoides infections are asymptomatic. The presentation of symptoms correlates with the length of infection, the number of worms present, and the overall health of the host. In-testinal symptoms range from mild-to-severe intestinal obstruction. Some patients develop pul-monary symptoms and with immune-mediated hypersensitivity pneumonia. The worms may cause an immune condition known as Löffler syndrome characterized by peripheral eosinophilia.
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Genetic studies of an animal show that eye color is controlled by an autosomal gene with the dominant allele (R) for red
eye color and the recessive allele (r) for yellow eye color. A second autosomal gene has the dominant allele (T) for paws with thumbs and the recessive allele (t) for paws without thumbs. The genetic cross RRTT x rrtt creates offspring with genotype RrTt. One of those dihybrids is mated in a testcross (RrTt x rrtt). Based on the principle of independent assortment, the testcross should produce offspring with the phenotype ratio ____.
a. 3 red-eyed with thumbs : 1 yellow-eyed without thumbs b. 1 red-eyed with thumbs : 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs : 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs : 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs e. 3 yellow-eyed with thumbs : 1 red-eyed without thumbs
The fact that the earth does not go up in flames in spite of the richness of oxygen in our environment is related to
which of the following concepts?
a. the activation energy needed to break bonds b. the fact that reactants always have less energy than products c. the first law of thermodynamics d. the second law of thermodynamics e. the abundance of water in our atmosphere which inhibits combustion
Figure 19.4
The area labeled "spark discharge" in the accompanying figure contained all of the following gases found in the ancient Earth atmosphere except:
A. carbon dioxide. B. methane. C. ammonia. D. water vapor. E. hydrogen gas.
Which ion channel is primarily responsible for the action potential?
A. The voltage-gated potassium channel B. The non-gated sodium channel C. The voltage-gated sodium channel D. The ligand-gated sodium channel E. The ligand-gated potassium channel