The first cells on Earth gained energy from ________
a. methane and hydrogen sulfide
b. photosynthesis using a C3 pathway
c. consuming other cells
d. absorbing short-wave UV radiation from sunlight
a
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What is the hydronium ion (H3O+) concentration in a solution at pH 5?
A. 5 × 105 M B. 1 × 105 M C. 1 × 10-5 M D. 5 × 10-5 M E. 2 × 10-1 M
Yucca flowers are pollinated only by yucca moths, which lay their eggs in the flower's ovary. This interaction ensures that the plant has seed for the next plant generation and that the moth larvae have a food source to develop
What is a potential disadvantage or vulnerability of this very specialized plant-animal interaction? A) Pollination can occur only during the day, but the moths are most active at night. B) If the moths are exterminated by insecticides, the plant-animal interaction ceases and the plant will no longer be pollinated or reproduce. C) The plant ovary may be consumed by the larvae, which would kill all the developing seeds. D) Other moths that do not serve as pollinators may outcompete the yucca moths.
Food and water appetites are under the regulatory influence of the _____
A) cerebrum B) thalamus C) hypothalamus D) medulla oblongata
Which phrase most accurately describes the genome of most viruses?
A) surprisingly complex, with around 1 million genes B) the same as most bacteria, with hundreds of genes C) relatively simple, with around a dozen genes or fewer D) surprisingly complex, with tens of thousands of genes