Astronauts returning to Earth from an extended stay in space have to be extremely careful not to break a bone. It takes several weeks to restore normal bone strength. Which would be the best regimen to rebuild the lost bone tissue?
A) Stay inactive, avoiding exercise until the lost bone tissue is rebuilt.
B) Hit the gym and get going with a few weeks of heavy weight lifting.
C) Several weeks of swimming will rebuild all lost bone mass.
D) Start with walking and build up to jogging, with an extra regimen of light weight lifting in the gym.
D
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How do the ? and ? forms of glucose differ?
A) Their ring structures differ in the location of a hydroxyl group. B) Their linear structures differ in the location of a hydroxyl group. C) The ? form can be involved in 1,4- and 1,6-glycosidic linkages; the ? form can participate only in 1,4 linkages. D) The oxygen atom inside the ring is located in a different position.
The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Which of the following diseases is almost diagnostic for AIDS?
A) blastomycosis B) coccidioidomycosis C) Pneumocystis pneumonia D) histoplasmosis E) Hantavirus pulmonary syndrome
The cell wall of bacteria constrains the ________ ________ that results from the osmolarity of the cytoplasmic contents.
Fill in the blank(s) with the appropriate word(s).