A persistent pathogen can evade the host immune system by
A. evolving changes in its envelope structure.
B. disrupting complement function.
C. producing toxins that inhibit phagocyte movement.
D. disrupting immune signaling.
E. slowing down its replication.
Answer: E
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In 1990, a small herd of white-tailed deer migrated into a new environment. Research indicated that the herd has reproduced exponentially with a doubling time of 5 years. It was estimated that this herd would reach its carrying capacity by 2005. In what year would the herd be "half way" to its carrying capacity? Explain
What will be an ideal response?
In a haploid organism, most mitosis occurs
a. after fertilization and before meiosis. b. after meiosis and before fertilization. c. between meiosis I and II. d. during G1. e. in diploid cells.
Just before a duckling was about to hatch, a dog came along and chased the female duck off of the nest. When the duckling hatched it saw the dog. When the dog moved away from the nest, the duckling followed the dog. This is an example of
A. ethology. B. anthropomorphism. C. imprinting. D. a dumb duck.
Which was common to experiments done by Avery and colleagues as well as Hershey and Chase?
A. Bacterial cells B. Radioactive DNA C. Virulent bacteriophage D. Radioactive protein E. Escherichia coli