Which phrase best describes a plant that is an epiphyte?
(a) a plant that grows upon another plant.
(b) a parasite.
(c) a plant with the gametophyte generation dominant and conspicuous.
(d) a plant that has a mutually beneficial relationship with another plant.
(a) a plant that grows upon another plant.
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Autotrophy has been observed among the ________.
A. cyanobacteria B. extreme thermophiles C. methanogens D. All of the choices are correct.
All of the following situations are passive modes of penetration for the invasion of host tissues by opportunistic pathogens EXCEPT
A. a bacterium adhering to intravenous tubing, forming a biofilm. B. a hiker being bitten by a tick. C. a child falling and scraping her knee. D. a firefighter receiving third-degree burns on the skin.
Spermatids are produced by:
A) secondary spermatocytes. B) spermatogonia. C) sertiary spermatocytes. D) primary spermatocytes.
Darwin's concept of evolution "the theory of descent with modification through variation and natural selection" can be demonstrated by which of the following examples?
A. A monkey accidentally drops her fruit in the salty water of a bay, she recovers the fruit and eats it. She discovers that the fruit is cleaner and tastes better after it has been in the salty water. She continues to wash fruit in the bay before eating. Her offspring see what she has done and also wash their fruit in the salty water. Soon the whole population is washing their fruit. B. A female alligator gives birth to a male alligator that has the ability to change color to a bright white when it is in cold water. The baby male alligator is quickly spotted by a large bird of prey and eaten. C. Several turtles hatch from a clutch of eggs buried in the sand on a beach. One of the turtles is the color of the sand, the others are darker in color. The turtles all scurry to the water, but one by one the dark turtles are eaten by birds, only the sand colored turtle survives. When it enters the water the sand color changes to a darker brown. The turtle grows, mates and has offspring that are also sand colored when they are born. D. A giraffe stretches his neck to reach higher branches. The exercise of stretching up strengthens the muscles in the neck and legs. This ability to stretch is also seen in the giraffe's offspring.