Ethylene has the effect of causing fruits to
A. enlarge.
B. ripen.
C. shrink.
D. elongate.
E. increase in juice content.
B. ripen.
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An example of a beneficial mutation is
A) a mutation in collagen that causes the skin to be extra stretchy. B) the mutation that causes sickle cell disease. C) a mutation in the CCR5 gene. D) a mutation in a cytokine gene that causes an allergy.
Human influenza viruses are usually derived from influenza viruses that infect
A. horses and sheep. B. cattle and water buffalo. C. a variety of primates. D. birds and pigs. E. chimpanzees and gorillas.
The transduction of sound waves into electrical signals takes place
A. within the middle ear as the vibrations are amplified by the malleus, incus and stapes. B. within the tectorial membrane as it is stimulated by the hair cell. C. as the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in a sensory neuron. D. as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds. E. within hair cells as they are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons.
The various types of chlorophyll differ in the
A. amount of light they can absorb. B. amount of ATP they produce. C. number of electrons they release. D. amount of oxygen they utilize. E. wavelengths of light they absorb.