The infectious stage of chlamydiae is called a(n) ________ body.
A. oogonial
B. contagious
C. elementary
D. reticulate
Answer: C
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An ALDH2 allele results in slow alcohol metabolism, leading to an accumulation of acetaldehyde. Therefore, individuals with this allele tend to _____
a. consume more alcohol than typical social drinkers b. be protected against alcoholism c. become alcoholics at high rates d. contain other alleles that protect against alcoholism e. have parents who are alcoholics
How was the mechanism of sympatric speciation among hemp nettles in nature verified experimentally?
a. By simply creating unique hybrids under laboratory conditions b. By producing hybrids that were 98% fertile under laboratory conditions c. By producing experimental hybrids that could reproduce successfully with both parent species d. By producing experimental hybrids that formed fertile offspring with the naturally occurring hybrid e. By creating hybrids that reproduced through the F4 generation before dying from hybrid inviability
Water is a major limiting factor in which of the following biomes?
A) tundra B) savannah C) tropical rainforest D) coral reef E) temperate grasslands
Which of the following is an example of natural selection?
A) depending on the food a turtle eats, it shell may grow faster or slower B) a bird's beak is able to effectively crack the seeds it encounters C) bacteria can be effectively killed by treatment with bleach D) sometime during human's life they break a bone and it heals E) human beings develop freckles from being out in the sun