Which of the following is a characteristic of all chordates at some point during their life cycle?
A) jaws
B) post-anal tail
C) four-chambered heart
D) vertebrae
B
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Which of the following diseases would be the easiest to control in a human population?
A) an infectious disease with wild animals as a reservoir B) an infectious disease with humans as the only reservoir C) an infectious disease with domestic cows as the only reservoir D) an infectious disease with several possible reservoirs
Which of the following are unique characteristics or components of the adaptive—but not innate—immune system? Select all correct choices
A. immune memory B. opsonization C. natural killer cells D. phagocytosis E. specificity
Which statement is false about prostaglandins?
a. They are local signaling molecules. b. They promote blood flow to injured tissue. c. They cause blood vessels to dilate. d. They act as pheromones. e. They alter chemical conditions in nearby tissues.
Male gamete having a haploid number of chromosomes and the ability to fertilize an egg, the female gamete.
What will be an ideal response?