Which organelle or structure is absent in plant cells?
A) mitochondria
B) microtubules
C) centrosomes
D) peroxisomes
C
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The natural habitat of a pathogen is referred to as its
A. home. B. primary inhabitance. C. infectious site. D. reservoir.
The reason that the various Hawaiian honeycreepers
are vulnerable to extinction is a. the reduction of their habitats. b. the warming of their habitats, supporting mosquitos that carry the pathogens for avian malaria c. the encroachment of humans into their habitats. d. the importation of new predators and competitors into their habitats. e. all of these answers.
Coat color in mice is determined by genes at two loci. When black mice from a particular population mate, they produce offspring in the following ratios: 9 black : 3 brown : 4 white. These results suggest that white coat color is expressed as a result of
(A) dominance (B) incomplete dominance (C) codominance (D) a sex-linked trait (E) epistasis
If one nephron in the right kidney becomes blocked and unable to function,
A. the kidney would become non-functional. B. the person would die. C. urine formation would not be greatly affected because there are 1.3 million nephrons in each kidney. D. the kidney would no longer be able to create urine. E. the filtration and urination rates would decrease significantly.