Fomites are
A. insects that transmit pathogens from an infected host to an uninfected host.
B. inanimate objects involved in the indirect contact transmission of pathogens.
C. fecal material from infected hosts.
D. animal sources for human pathogens.
E. silent carriers of infectious diseases.
Answer: B
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A ________ is a cancer of blood cells in which the cells proliferate in the bloodstream.
Fill in the blank(s) with the appropriate word(s).
The sexual life cycle of plants is described as alternation of generations because it alternates between
A) reproductive plants and vegetative plants. B) eggs and sperm. C) flowers and spores. D) male plants and female plants. E) sporophytes and gametophytes.
On a trip to the Southwest United States, you and a friend collect some seeds from a piñon, a type of pine tree. Your friend also gathers a small bagful of soil from under the piñon tree. Back home, both of you plant your seeds in commercial sterilized
potting soil, but your friend adds a spoonful of the collected dirt to each of her pots. Her seedlings do better than yours. What is the likeliest explanation for your differences? A) Pine seedlings are better adapted to the sandy soil of the Southwest than to commercial potting mix. B) The soil from the Southwest probably contained macronutrients missing from the potting mix. C) The soil from the Southwest probably contained nitrogen-fixing bacteria that colonized the seedlings' root nodules. D) The soil from the Southwest probably contained fungi able to establish a mycorrhizal association with the seedlings' roots.
The guard cells surrounding each stoma close the stomata periodically to
1. carry out cellular respiration 2. prevent water loss 3. conduct photosynthesis 4. absorb nutrients