Based on your knowledge of cost-benefit analysis, why would you expect some white-fronted bee-eaters to fly very far away from their nests to forage when there are food sources nearby?
A) There might be some plentiful food sources further away.
B) Competition for food is too intense near the nest.
C) Food near the nest is usually of lower quality.
D) Predation is highest closest to the nest.
Answer: A
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Superantigens produce a harmful immune response because
A) they activate too many T cells, causing excessive inflammation and cell damage. B) they initiate a type I allergic response resulting in excessive inflammation. C) too many phagocytes are activated and destroy host tissue. D) a strong immune response is necessary to protect the host from the pathogen.
Match the gene or gene product on the left with the gene category on the right. Note choices on the right may be used more than once or not at all.
A) proto-oncogene B) tumor suppressor gene C) oncogene D) low in invasive cells 1) BRCA-1 2) E-cadherin 3) p53 4) erbB 6) Cdk4 7) MYC 8) v-ras 9) v-myc 10) v-src
Vitamin D can be synthesized by the body from a derivative of cholesterol. Given this information, predict vitamin D's solubility.
A. Vitamin D is fat soluble. B. Vitamin D is not soluble in either water or fat. C. Vitamin D is soluble in both water and fat. D. Vitamin D is water soluble.
Which of the following controls fluid balance by reabsorption of water and sodium?
A) aldosterone B) antidiuretic hormone C) osmoreceptors D) chemoreceptors