For every glucose molecule that goes through cellular respiration, how many carbon atoms are fully oxidized to CO2 in the citric acid cycle?
a. 1
b. 2
c. 3
d. 4
e. 5
ANSWER: d
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Research on transgenic Drosophila models of Huntington disease has found that ____
a. the NUB1 protein decreases levels of mutant huntingtin protein, and thereby, cell death b. the mutant huntingtin protein is destroyed by the SOD1 protein c. Drosophila and humans share more than 90% of genes d. the accumulation of mutant proteins in the brain causes Huntington disease e. treatment of patients with Rhes protein cures Huntington disease
A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). Forty minutes later, the researcher looked at the fused cell and observed ____.
a. the cell was still half red and half green. b. the red and green fluorescent labels were uniformly distributed across the entire membrane c. the red and green labels were distributed in intermingled patches d. the red and green labels flashed intermittently e. the red and green labels were distributed in a swirling pattern
Which of the following statements regarding schistosomiasis is incorrect?
A. Once a person has recovered from an infection with Schistosoma mansoni, they are protected with lifelong immunity. B. Schistosomiasis is transmitted by exposing the skin to a water source that has been contaminated with sewage. C. There is only a single drug available to treat Schistosoma infection, praziquantel, and drug-resistant strains are beginning to arise. D. Efficacy of treatment is assess by observing fecal samples placed in water for whether eggs can hatch to release live miracidia.
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in systemic arteries?
A) 80mmHg B) 100mmHg C) 40 mm Hg D) 46 mm Hg E) 160 mm Hg