So far, the only disease that has been globally eradicated is
A.
polio.
B.
smallpox.
C.
measles.
D.
diphtheria.
B
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In a newly fertilized egg, the vitelline layer _____
A) opens the egg's nuclear membrane to allow haploid sperm DNA to enter B) lifts away from the egg and hardens to form a fertilization envelope C) secretes hormones that enhance steroidogenesis by the ovary D) reduces the loss of water from the egg and prevents desiccation E) provides most of the nutrients used by the zygote
Countercurrent flow of water and blood increases the efficiency of gas exchange in _____
a. fishes c. birds b. amphibians d. all of these
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.
In bacteria, which protein is required for ribosomal translocation?
a. EF-Tu b. eIF2 c. IF-2 d. EF-Ts e. EF-G