Luke sprained his ankle, tearing some of the collagen protein that forms his ligaments. Some types of collagen consist of three polypeptide chains twisted together to form a rope-like strand. What level of protein structure does this rope-like strand represent?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
D. Quaternary
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Assuming some bacteria did enter her body, an example of the second line of defense against
these bacteria includes __________.
a. phagocytes b. mucus c. macrophages d. antibodies
Flatworms lack
A) the ability to move. B) a respiratory system. C) a reproductive system. D) a digestive cavity. E) a nervous system.
Birds follow a herd of water buffalo to catch insects that are disturbed as the large herbivores walk through the grass. When large predators are near, the birds fly into the air and make warning calls. Who are the birds warning?
A) Other birds, who also catch insects stirred up by the water buffalo B) The water buffalo, so they can avoid attack C) Their competitors D) The predators, so they know their prey, the water buffalo, is near E) The water buffalo's prey, because they need to escape