Which of the following is NOT characteristic of
sensation?
a. Some sensory receptors are activated only by
chemicals.
b. Nerve impulses mediating each of the senses are
essentially the same.
c. Sensory neuron activity follows the all-or-none
law.
d. All organisms use the same sense organs to
perceive their environments.
e. All sensory receptors transduce stimulus energy
into action potentials.
Answer: d
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A C4 plant minimizes photorespiration by
A. stomata that are only opened at night, storing carbon dioxide in malate, and releasing carbon dioxide during the day. B. having the light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco. C. having the light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco. D. stomata that are only opened at night, storing oxygen in malate, and releasing oxygen during the day.
Which of the following types of molecules are the most diverse in terms of structure and types of roles
in cells?
a. proteins b. lipids c. nucleic acids d. carbohydrates e. amino acids
What is an alternative to RNA as the first polymer of life?
a. nucleotides b. non-genetic polymers c. polymers that do not form a double helix d. other genetic polymers containing different sugars e. other genetic polymers containing different amino acids
Which of the following represents the possible genotype(s) resulting from a cross between two individuals that are
heterozygous (Bb)? a. BB and Bb b. BB, Bb, and bb c. BB only d. Bb only e. bb only