What role do capsules and protein A play as virulence factors of Staphylococcus aureus?
A) lyse red blood cells
B) protect the bacterium from phagocytosis
C) protect the bacterium from neutrophils
D) form blood clots
E) break down blood clots
Answer: B
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All the following statements about the concept of niche are true, EXCEPT -
a) A niche is the range of conditions an organism can survive in b) The fundamental niche is always a subset of the realized niche c) The niche of an organism is influenced by predators and competitors d) The fundamental niche is all the environmental conditions that allow a species to maintain a stable population size e) None of the above (all are true)
Identify the crustaceans in this group. Check all that apply.
_____ krill. _____ barnacles. _____ ostracods. _____ pill bugs. _____ horseshoe crabs.
What mammals retain their young for a long period of development within the mother's uterus?
A. placentals B. marsupials C. monotremes D. no mammals retain their young within the female
Which of the following features of a membrane protein is (are) never used as a membrane anchor?
a. C-terminal glycosylphosphatidyl inositol (GPI) b. An N-terminal myristoyl group c. Prenyl and palymitoyl group additions d. Oligosaccharide side chains