Four of the five characteristics listed below are
typical of veins. Select the exception.
a. blood volume reservoirs
b. contain valves
c. low-resistance transport tubes
d. transport oxygen
e. low blood pressure
Answer: d
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A surprising finding of environmental metagenomic studies is that a majority of genes in the environment are
A) from microbes grown in the lab. B) viral in origin. C) eukaryotic in origin. D) from extinct microorganisms.
Which of the following is NOT a morphogen?
A. activin B. noggin C. Wnt D. cadherin E. protein produced by Spemann's organizer (dorsal lip of a gastrula)
Net productivity can be measured as
A. numbers of herbivores. B. biomass of detritivores. C. energy stored in biomass. D. sunlight striking an area of the planet. E. None of these choices are correct.
In microbiology, growth usually refers to an increase in size of the bacteria
Indicate whether this statement is true or false.