Which of the following choices is an example of selfish herd behavior?
a. A prairie dog alarm calls at the sight of a predator
b. Male sunfish try to build nests in the center of a group of nests.
c. Only the dominant pair in a pack of wolves mate.
d. A pride of lions defends its territory from other lions.
b
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How can the amebozoans, cercozoans, and radiolarians be distinguished from each other with microscopy if they all have pseudopodia?
A) Amebozoans have lobe-shaped pseudopodia, cercozoans and radiolarians both have threadlike pseudopodia, and radiolarians have radial symmetry. B) Amebozoans have lobe-shaped pseudopodia, and cercozoans are significantly smaller in size but contain threadlike pseudopodia just like radiolarians. C) Amebozoans have large pseudopodia, cercozoans have lobe-shaped pseudopodia, and radiolarians have radial threadlike pseudopodia. D) Amebozoans have multiple lobe-shaped pseudopodia, cercozoans have one or two threadlike pseudopodia, and radiolarians have multiple threadlike pseudopodia.
When the atria of the heart are filled, which
valves are closed?
a. atrioventricular b. aortic c. pulmonary d. pulmonary and aortic e. all of these valves are closed
Explain why passive immunization is not effective in producing long-term immunity
What will be an ideal response?
Which of the following is true regarding cultivation and isolation of animal viruses?
a. Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host. b. The preferred and widely used method of viral isolation and growth is via growth in an embryonated egg. c. Mouse models are available for virtually all human viral infections and can be routinely used for vaccine development. d. Viruses can be easily grown in liquid culture without any other organisms present.