Within one or two weeks after infection with Plasmodium, ruptured liver cells release _____ and cellular debris into
the host's bloodstream, causing fever and weakness characteristic of malaria.
a. sporozoites
b. merozoites
c. Anopheles mosquitoes
d. gametocytes
e. zygotes
ANSWER: b
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Answer the following statements true (T) or false (F)
1. No microorganisms are able to live in the stomach because of the extremely low pH of the stomach contents. 2. Microbial communities known as biofilms are interesting, but they have no medical significance. 3. Microorganisms are unable to live in the colon owing to the lack of oxygen there. 4. Some of the bacteria used in bioremediation are naturally occurring, but others have been genetically engineered. 5. Many of the members of our indigenous microflora have the potential to cause disease.
A sorus is a cluster of ____
a. sporangia b. fronds c. strobili d. gametangia e. rhizomes
Describe the different types of microbial competition and the role of microbial metabolites in mediating those interactions.
What will be an ideal response?
Suppose that each species of Galápagos tortoise has a distinctive shell. Variations in shell size make some tortoises better adapted for defence. Imagine an island where many hunt on these tortoises; individuals with a larger shell would be more likely to survive and reproduce than would tortoises with smaller shells. These favoured individuals would pass on the genes that produce larger shells to their descendants, while those with smaller shells would not reproduce, leading to extinction. Which of the following would be most likely to drive this event?
a. spontaneous selection b. hereditary selection c. natural selection d. artificial selection