Which of the following is a correct statement about sugar movement in phloem?
A) Diffusion can account for the observed rates of transport.
B) Movement can occur both upward and downward in the plant.
C) Sugar is translocated from sinks to sources.
D) Only phloem cells with nuclei can perform sugar movement.
B
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The basic reproduction number of a pathogen
A) can vary during an epidemic based on infection control measures. B) can be determined experimentally in the lab. C) is usually high for pathogens that are transmitted through direct contact. D) can be determined experimentally and is usually high for pathogens that are transmitted through direct contact.
Which of the following Mycoplasma species is associated with individuals who are positive for human immunodeficiency virus (HIV), is capable of invading human cells, and can modulate the immune system?
a. M. pneumoniae b. M. genitalium c. M. hominis d. Mycoplasma fermentans
The proportion of individuals in a population that are of a particular phenotype is the
A) phenotype frequency. B) genotype frequency. C) allele frequency. D) None of the choices is correct.
Which term denotes the conditions, resources, and interactions necessary for survival and reproduction of a species?
a. habitat b. niche c. carrying capacity d. community e. ecosystem