In malaria, Plasmodium falciparum grow inside human cells. Because they use the human cells for food, they are which of the following?
A. heterotrophs and autotrophs
B. phototrophs
C. heterotrophs
D. autotrophs and phototrophs
E. autotrophs
C. heterotrophs
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A higher frequency of action potentials is interpreted by the brain as a(n):
a. somatic sensory stimulus b. visceral sensory stimulus c. strong sensory stimulus d. localized sensory stimulus e. weak sensory stimulus
In eukaryotes, the greatest relative amount of tandemly repeated DNA is associated with centromeres and telomeres
Indicate whether the statement is true or false
A newly described unicellular organism was isolated from a salt mine. This organism has no membranous organelles and its cell wall lacks peptidoglycan. Attempts to culture it in a medium with less than 25% salt were unsuccessful, but it was able to grow well on 25% salt supplemented agar. This organism would best be described as a ________ and is most likely in the domain ________.
A. halophile; Archaea. B. thermophile; Bacteria. C. halophile; Bacteria. D. thermophile; Archaea. E. thermophile; Eukarya.
The greenhouse effect is
A) of little concern, since it is part of the normal cycle for the planet. B) reduced by photosynthesis, which removes carbon dioxide from the atmosphere. C) reduced by the addition of carbon dioxide to the atmosphere, since carbon dioxide removes excess heat from the Earth's surface and reflects it back into space. D) made worse by photosynthesis, which adds carbon dioxide to the atmosphere. E) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere.