The hominin fossils we have discovered are fossils of our direct ancestors
a. true
b. false
Ans: b. false
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Which one of the following statements about diplomonads and parabasilids is false?
A. Absence of mitochondria in these groups is an ancestral trait. B. Some members are parasitic, but some also engage in mutualism. C. Diplomonads and parabasilids belong to different clades D. Both groups are flagellated protists.
Circulation in the accompanying diagram functions primarily as a(n) ____
a. an open circulatory system b. system consisting of mostly of tissue spaces c. closed circulatory system d. interstitial fluid system e. three-directional system
Asplenic individuals have low levels of IgM, and because of this have an increased risk of infection with encapsulated bacteria. How does IgM help control encapsulated bacteria?
A) IgM antibodies bind to bacterial capsules, and clump bacterial cells together, facilitating phagocytosis B) IgM antibodies upregulate body temperature C) IgM antibodies decrease blood pressure D) IgM antibodies cause tachypnea
If you discovered a new colonial organism living deep on the sea floor, how could you determine whether it reproduced sexually or asexually? (Check all that apply)
A. Compare DNA to see if nearby individuals are identical. B. Compare morphology to see if nearby individuals are identical. C. Look for a coelom. D. Look for gonads with meiotic figures and gametes. E. Look for external buds still attached to the parent. F. Look for gonads with mitotic figures and embryos.