In mammals, the binding of an antigen to a
cell’s receptors directly activates
a. complement proteins.
b. adaptive immunity.
c. PAMPs.
d. genes on DNA.
e. killer T cells
A
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Imagine that you are studying a new species. As you examine the circulatory system, you note that the diameter of the vessels grows smaller and smaller as you move farther from the heart, but the blood is always contained within vessels. If you want to place this new species into a group whose membership is solely based on whether the animals included share this described type of circulatory system, which animals would be included in this group? Check all that apply.
_____ all mollusks _____ frogs _____ fish _____ housefly
What is the primary characteristic of all animals in the phylum Arthropoda?
a. jointed appendages b. incomplete digestive systems c. asexual reproduction d. pseudocoelomic body cavities
A human X-linked gene is
a. found only in males. b. more frequently expressed in females. c. found on the Y chromosome. d. transmitted from father to son. e. found on the X chromosome.
In sponges, spicules are secreted by amoeboid cells
____________________ Indicate whether the statement is true or false.