The proposed advantages of bipedalism, which characterizes hominin evolution, include making it easier to
A. travel and move about.
B. collect food from overhead.
C. carry their young from place to place.
D. carry food back to their camp or their young.
E. All of these are correct.
Answer: E
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A slime coat called peptidoglycan covers the walls of many bacteria
Indicate whether the statement is true or false.
Based on what you know about resistance to infection, why are some people resistant to HIV?
A) They have a strong immune system that clears the virus completely. B) They have been immunized in an experimental program. C) They can't be infected with HIV even when exposed. D) They never engage in risky behavior and thus can't become infected.
Which result is an observed effect of global warming on organisms?
A) Some species of birds and frogs now begin their breeding seasons earlier in the year. B) Corals "bleach" when decreased water temperatures cause them to expel their symbiotic algae. C) Many butterfly populations have shifted their ranges toward the equator. D) Many polar bears produce more offspring as their hunting grounds increase in size.
Which genus contains members that are human pathogens?
a. Caulobacter b. Neisseria c. Myxococcus d. Desulfovibrio