Amphibians are thought to have evolved from
A. spiny fish.
B. lobe-finned fish.
C. ray-finned fish.
D. skates and rays.
E. annelids.
Answer: B
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Which statement correctly explains the Gram stain reaction of archaeal cells?
A. Some are Gram-positive and some are Gram-negative due to the diverse chemical structure. B. They don't stain - basic dyes used in the Gram stain don't adhere to archaeal cells. C. They are Gram-negative due to the lack of peptidoglycan in their cell walls. D. They are Gram-positive due to the pseudomurein layer in their cell walls.
Molecular motor use ATP as the energy source to power the molecular motor.
a. true b. false
The community of detritivores, such as earthworms, millipedes, slugs, and pseudoscorpions, living in the leaf litter on the shady floor of a deciduous forest obtains its energy and nutrients primarily from
A) decomposition of the leaves of deciduous trees that fall on the surface of the soil. B) chemosynthesis by green and purple sulfur bacteria living on the surface of the leaves. C) photosynthesis or algae living in the soil beneath the leaves. D) carbohydrates formed in the roots of the trees that leach out into the surrounding soil. E) predation on one another.
You owe your life to chloroplasts. The reason for this is that:
A) when we eat plants, it is the chloroplasts that are the nutritious part of plant cells. B) chloroplasts produce all the water and carbon dioxide essential for life. C) chloroplasts supply all the ATP needed by living organisms. D) chloroplasts produce the oxygen we breathe and ultimately are the source of most nutrients we consume. E) like the ancestors of mitochondria, the ancestors of chloroplasts were once bacteria taken up by a eukaryotic cell.