During prophase I, each chiasma represents:
a. the remnants of the nuclear envelope.
b. the remnant of the nucleolus.
c. a newly formed haploid gamete.
d. a site of crossing-over.
e. the site where sister chromatids are connected.
d
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Both environmental conditions and nutrient resources strongly influence the composition of a microbial community
Indicate whether the statement is true or false.
Which of the following is an example of herd immunity?
A) Brucellosis is no longer found in farm animals in the United States. B) If 70% of the population is immunized against polio, the disease will be essentially absent from the population. C) Federal law requires that all cattle not immune to anthrax be destroyed. D) All farm animals used for food must be immunized against all the common agents of disease that infect humans.
Predators often avoid a mimic species because of ____
a. bad taste b. toxic secretion c. resemblance to a well-defended species d. painful sting e. cryptic coloration
A certain species of tiny wasp lays its eggs within the bodies of caterpillars, whereupon the larvae of the wasp consume the 10-g caterpillar
Assuming that the entire victim was consumed, what would be the total mass of the eventual adult wasps that emerge from the caterpillar? A) 10 g B) 1 g C) 100 g D) 2 g