Why is it more difficult to obtain sufficient oxygen at higher altitudes? What will be an ideal response?
Concepts to Consider: Barometric pressure decreases at higher altitudes. The concentration of
oxygen in air is 21%, so the partial pressure of oxygen decreases along with barometric pressure.
Recall, oxygen flows from high pressure to low. At an altitude of 10,000 m, the partial pressure of
oxygen is 50 mm Hg, and arterial oxygen saturation is only 20% (normal partial pressure of oxygen in
blood is 100 mm Hg and 40 mm Hg in the tissues
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If 100 females produce 50 offspring, the age specific fertility rate is
A. 0.75. B. 0.5. C. 2. D. 50. E. impossible to calculate with this information.
You have received the first hepatitis A vaccine. It was required for your mission trip to Nicaragua in Central America, where hepatitis A is common. However, you never went back for the booster shot of the vaccine, which should have been received within 6 months of the initial vaccination. What statement accurately reflects your present immunity to this pathogen?
A. Not a problem because at any time, in a year, 5 years, etc., you can go get the booster vaccine for hepatitis A and be fully covered by immunity. B. You are at risk to get hepatitis A since your immune status is only partial. Not enough immune memory cells were produced since you received one dosage of vaccine, so you are likely to get the disease when exposed to the virus. C. This is not a problem because the second dosage is just extra protection. Your immune status would be very high. D. The one dosage is not enough because it only activated humoral immunity. The second dosage is used to activate cell-mediated immunity. The combination of the two immune responses gives you 100% coverage of immunity to hepatitis A.
An ovule usually develops directly into a(n) fruit. Indicate whether the statement is true or false
A ribozyme is _____
A) a catalyst that uses RNA as a substrate B) an RNA with catalytic activity C) an enzyme that catalyzes the association between the large and small ribosomal subunits D) an enzyme that synthesizes RNA as part of the transcription process