Which of the following are primary lymphoid organs?
What will be an ideal response?
bone marrow and thymus
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The specificity of certain rhizobia to infect only particular plants is in part due to the
A) abundance of nutrients present in the soil. B) nifH genes they possess. C) rhizobial lipids that act as signaling molecules. D) season (time of year).
Like most birds, what nonbird reptiles are highly vocal and engage in complex parental behavior?
a. crocodilians b. turtles c. lizards d. snakes e. amphibians
What is the function of the simple squamous cells found in the glomeruli of the kidney?
A. secrete and propel mucus B. secrete and absorb substances C. protect areas subject to abrasion D. secrete hormones E. allow exchange of substances by diffusion and osmosis
"An athlete who uses dietary supplements will perform better than one who doesn't." This statement would be an example of which of the following?
A) theory B) hypothesis C) clinical trial D) inductive reasoning